Little Sitkin

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Facts


  • Official Name: Little Sitkin Island
  • Seismically Monitored: Yes
  • Color Code: GREEN
  • Alert Level: NORMAL
  • Elevation: 1188m (3897ft)
  • Latitude: 51.9531
  • Longitude: 178.5356
  • Smithsonian VNum: 311050
  • Pronunciation:
  • Nearby Towns:
    • Shemya Station 194 mi (312 km) NW
    • Adak 206 mi (332 km) SE
    • Attu Station 233 mi (375 km) NW
    • Atka 309 mi (497 km) NE
    • Nikolski 534 mi (860 km) NE

    Distance from Anchorage: 1343 mi (2161 km)

  • Subfeatures:
    • Caldera One
    • Caldera Two

Description

From Miller and others (1998) [1] : "The active stratovolcano on Little Sitkin Island occurs within the eroded remnants of a nested double caldera of probable late Pleistocene age. The older caldera (Caldera One) is about 4.8 km in diameter and is centered slightly northeast of the island's midpoint. The caldera formed at the site of a large stratovolcano, the remnants of which are the oldest rocks exposed on the island (unit Qtw [2] ).
"A second stratovolcano was constructed almost entirely of lava flows (unit Qd) within Caldera One and attained a height of about 900 m. A cataclysmic eruption, possibly in early post-glacial time, resulted in the formation of a second, smaller caldera (Caldera Two) that partially destroyed this cone. Caldera Two is elliptical in outline and measures 2.7 by 4 km; the inferred eastern and southern margins are coincident with those of Caldera One. Field relations suggest that the northern boundary of Caldera Two is a hinge along which a large block, comprising most of the Caldera One stratovolcano, was tilted southward during the caldera eruption. The highest peak on the island is on the post-caldera remnant of the second cone.
"A deposit of partly welded tuff up to 100 m thick (unit Qp) extends from the remnant cone northwest across the Caldera Two boundary fault, to slightly beyond the inferred location of the Caldera One boundary fault. The deposit is thought to have been emplaced by one of more pyroclastic flows, possibly associated with formation of Caldera Two [2] .
"Post-Caldera Two deposits are mainly lava flows (units Qls, Qlp, and Qlw). Two relatively recent aa flows have well developed levees; one originated from the breached central crater of Little Sitkin volcano, and the other from a fissure along the western trace of the Caldera One boundary fault [2] ."

Name Origin

The island of Little Sitkin was named "O[strov] Malyy Sitkhin," meaning "little Sitkin island" on the 1848 Russian Hydrographic Department Chart 1400. The name "Sitkin" may possibly be from the Unangam Tunuu word "sixtan," which, according to R.H. Geoghegan, means "from beneath or from under" (Orth, 1971). Bergsland (1994) translates this word as "dung" or "defecator."


References Cited

[1] Catalog of the historically active volcanoes of Alaska, 1998

Miller, T. P., McGimsey, R. G., Richter, D. H., Riehle, J. R., Nye, C. J., Yount, M. E., and Dumoulin, J. A., 1998, Catalog of the historically active volcanoes of Alaska: U.S. Geological Survey Open-File Report 98-0582, 104 p.

[2] Geology of Little Sitkin Island, Alaska, 1959

Snyder, G. L., 1959, Geology of Little Sitkin Island, Alaska: in Investigations of Alaskan volcanoes, U.S. Geological Survey Bulletin 1028-H, p. 169-210, 1 plate, scale 1:20,000.

Current Activity

No new updates for Little Sitkin volcano since July 14, 2022, 2:40 pm.

Webcams

Webicorder

Color Code Timeline

Reported Activity

Modern Eruptions

Little Sitkin

Little Sitkin Eruption Timeline

Grewingk (1850: "1776, In July Mt. Sitignak belching fire." Coats (1950) states that this eruption was probably at Little Sitkin.

Grewingk (1850, translated 2003 by Fritz Jaensch): "1828, Little Sitkin, Akun, Akutan, Tanakh-Angunakh, Atka, Koniushi, Gareloi, and Unimak (Shishaldin) smoking."
Dall (1870), summarizing Grewingk: "Little Sitkin, Akhun, Akutan, Tanak-Angunakh, Atka, Koniushi, Goreloi, and Shishaldin smoked. The disturbances continued for two years." Dall (1870) reads as if the smoking on all of these islands continued for two years, but Grewingk (1850, translated 2003 by Fritz Jaensch) is more clear -- the next entry, for 1829 reads "On Unimak, Shishaldin smokes until fall of 1830." Presumably, the other volcanoes listed were only smoking during 1828.

Miller and others (1998): "Evidence of more recent volcanism is provided by Snyder (1959), who mapped two dacitic flows on the south and west flanks of the crater that appeared no more vegetated at comparable altitudes than andesite flows produced during a well-documented 1906 eruption on Kanaga Island, 60 km to the west. Snyder (1959, p. 183) argues that these extrusions 'are not older than' the 1906 Kanaga flows, implying that Little Sitkin has erupted at least once during the 20th century."

Little Sitkin 2012/8

August 22, 2012 — November 26, 2012

From Herrick and others (2014): "Seismic activity at Little Sitkin began to increase on August 22. Although volcano-tectonic earthquakes accounted for most of the seismicity, some unusual signals also were observed, most notably monochromatic earthquakes. A series of 5 monochromatic earthquakes that had unusually low resonant frequencies (0.6 Hz) that occurred during August 24-28. These earthquakes occurred at depths depths between 10 and 20 km (6-12 mi) and were recorded on seismic stations as far away as 80 km (50 mi) on Amchitka and Semisopochnoi Islands. These signals at Little Sitkin appear similar to that seen at Izu-Oshima Volcano in Japan (Ukawa and Ohtake, 1987). Two brief episodes of tremor also were recorded during this time.
"On August 30, earthquake activity escalated dramatically, prompting AVO to upgrade the Aviation Color Code and Volcano Alert Level to YELLOW/ADVISORY. AVO instituted a heightened seismic watch schedule to examine seismic data every 2 hours. An RSAM alarm was established for Little Sitkin to alert seismologists in the event of a sudden escalation in seismicity. Frequent earthquakes continued through August 31, then decreased during the first few days of September. Of the 110 earthquakes located during the first week of September, epicenters averaged 3.5 km (2.2 mi) from the summit. After a short flurry of earthquakes on September 13, seismicity decreased, but remained well above background. On September 24, AVO reduced the frequency of seismic data checks to once every 6 hours.
"Over the next 3 months, seismicity consisted of low-frequency tremor bursts with occasional brief swarms of VT events. Three notable flurries of seismicity occurred on October 13, 15, and 29. Another pulse of VT activity began on November 15 and continued through November 26. Six?hour seismic checks for Little Sitkin were discontinued on October 8.
"On January 9, 2013, after more than a month of relative quiet and continued decrease in overall seismicity, AVO downgraded the Aviation Color Code and Volcano Alert Level to GREEN/NORMAL. (Note that prior to the onset of seismicity and upgrade to YELLOW/ADVISORY in August, the volcano had been designated UNASSIGNED. Technically, it should have returned to UNASSIGNED, but this did not happen until March 29, 2013).
"Satellite images of the largest hot spring area west of the modern Little Sitkin cone showed that no significant change had occurred in the area since the last observations in late-October and early-September 2012. AVO received no reports from mariners or air crews of any changes at the surface; however, this part of the Aleutian Arc receives few visitors throughout the year and minor changes in activity could well go unnoticed.
"Subsequent analysis of InSAR results from images that span the time period of increased seismicity indicates 1-2 cm (0.4-0.8 in.) of inflation beneath the modern Little Sitkin cone. This result, along with the evolution of the seismic sequence in 2012, strongly suggests a magmatic intrusion as the source of observed seismicity and geodetic change (Haney and others, 2014)."

Helicorder record showing a swarm of primarily volcano-tectonic earthquakes at Little Sitkin volcano on August 30, 2012. Of the more than 60 locatable events during this swarm, most occurred between 4 and 10 km (2.5 and 6.2 mi) depth below sea level. Epicenters clustered in the northwestern quadrant of the island.
tac14-5218_
Image courtesy of AVO/USGS.
Helicorder record showing a swarm of primarily volcano-tectonic earthquakes at Little Sitkin volcano on August 30, 2012. Of the more than 60 locatable events during this swarm, most occurred between 4 and 10 km (2.5 and 6.2 mi) depth below sea level. Epicenters clustered in the northwestern quadrant of the island. tac14-5218_

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Little Sitkin 2012/8

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6 Event Date(s)

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Showing 1 - 20 of 70

Map Images


Map References


Recently active volcanoes of Alaska, 2023

Cameron, C.E., Bull, K.F., and Macpherson, A.E., 2023, Recently active volcanoes of Alaska: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 133 v. 6, 2 sheets. https://doi.org/10.14509/31086.

Historically active volcanoes of Alaska, v. 3, 2018

Cameron, C.E., Schaefer, J.R., and Mulliken, K.M., 2018, Historically active volcanoes of Alaska: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 133 v. 3, 2 sheets. Http://doi.org/10.14509/30142

Historically active volcanoes of Alaska, 2014

Schaefer, J.R., Cameron, C.E., and Nye, C.J., 2014, Historically active volcanoes of Alaska: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 133 v. 1.2, 1 sheet, scale 1:3,000,000. This publication has been superseded. Newest version available at http://www.dggs.alaska.gov/pubs/id/20181 .

Digital data for the reconnaissance geologic map of the western Aleutian islands, Alaska, 2006

Wilson, F.H., Mohadjer, Solmaz, Labay, K.A., Shew, Nora, and Grey, D.M., 2006, Digital data for the reconnaissance geologic map of the western Aleutian islands, Alaska: U.S. Geological Survey Open-File Report 2006-1302, 1 p., available online at http://pubs.usgs.gov/of/2006/1302/

Historically active volcanoes of the Aleutian Arc, 2002

Schaefer, Janet, and Nye, C. J., 2002, Historically active volcanoes of the Aleutian Arc: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication MP 0123, unpaged, 1 sheet, scale 1:3,000,000. Superceded by Miscellaneous Publication 133: http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=20181

Volcanoes of Alaska, 1998

Nye, C. J., Queen, Katherine, and McCarthy, A. M., 1998, Volcanoes of Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular IC 0038, unpaged, 1 sheet, scale 1:4,000,000, available at http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=7043 .
Hard Copy held by AVO at FBKS - CEC shelf

Volcanoes of Alaska, 1995

Alaska Division of Geological & Geophysical Surveys, 1995, Volcanoes of Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular IC 0038, unpaged, 1 sheet, scale 1:4,000,000.

Aleutian arc volcanoes, 1994

Nye, C. J., 1994, Aleutian arc volcanoes: Alaska Division of Geological & Geophysical Surveys Public-Data File PDF 94-54, unpaged, 1 sheet, scale 1:2,126,841.

Geothermal resources of the Aleutian Arc, 1993

Motyka, R. J., Liss, S. A., Nye, C. J., and Moorman, M. A., 1993, Geothermal resources of the Aleutian Arc: Alaska Division of Geological & Geophysical Surveys Professional Report PR 0114, 17 p., 4 sheets, scale 1:1,000,000.
Hard Copy held by AVO at FBKS - CEC shelf

Holocene volcanoes of the Aleutian Arc, Alaska, 1993

March, G. D., 1993, Holocene volcanoes of the Aleutian Arc, Alaska: Alaska Division of Geological & Geophysical Surveys Public-Data File PDF 93-85, unpaged, 1 sheet, scale 1:2,000,000.

Map showing distribution, composition, and age of Late Cenozoic volcanic centers in Alaska, 1986

Luedke, R. G., and Smith, R. L., 1986, Map showing distribution, composition, and age of Late Cenozoic volcanic centers in Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I 1091-F, unpaged, 3 sheets, scale 1:1,000,000.

Geothermal energy resources of Alaska, 1980

Turner, D. L., Forbes, R. B., Albanese, Mary, Macbeth, Joyce, Lockhart, A. B., and Seed, S. M., 1980, Geothermal energy resources of Alaska: University of Alaska Fairbanks Geophysical Institute Report UAG-R 279, 19 p., 3 sheets, scale 1 at 1:2,500,000.

Geology of Little Sitkin Island, Alaska, 1959

Snyder, G. L., 1959, Geology of Little Sitkin Island, Alaska: in Investigations of Alaskan volcanoes, U.S. Geological Survey Bulletin 1028-H, p. 169-210, 1 plate, scale 1:20,000.
Hard Copy held by AVO at FBKS - CEC shelf

Ocean floor structures, northeastern Rat Islands, Alaska, 1957

Snyder, G. L., 1957, Ocean floor structures, northeastern Rat Islands, Alaska: in Investigations of Alaskan volcanoes, U.S. Geological Survey Bulletin 1028-G, p. 161-167, 1 plate, scale 1:125,000.
full-text PDF 325 KB
plate 22 PDF 5.6 MB
Hard Copy held by AVO at FBKS - CEC shelf

Reconnaissance geology of some western Aleutian Islands, Alaska, 1956

Coats, R. R., 1956, Reconnaissance geology of some western Aleutian Islands, Alaska: in Investigations of Alaskan volcanoes, U.S. Geological Survey Bulletin 1028-E, p. 83-100, 1 sheet, scale unknown.
full-text PDF 4.4 MB
plate 17 PDF 1.6 MB

Configuration of the Aleutian Ridge: Rat Islands-Semisopochnoi I. to west of Buldir I., 1953

Gibson, William, and Nichols, H., 1953, Configuration of the Aleutian Ridge: Rat Islands-Semisopochnoi I. to west of Buldir I.: Abstracts with Programs - Geological Society of America, v. 64, n. 10, p. 1173-1188, 2 sheets, scale unknown.

Volcanic activity in the Aleutian Arc, 1950

Coats, R. R., 1950, Volcanic activity in the Aleutian Arc: U.S. Geological Survey Bulletin 0974-B, p. 35-49, 1 sheet, scale 1:5,000,000.
plate 1 PDF 819 KB
full-text PDF 783 KB
Hard Copy held by AVO at FBKS - CEC shelf

Reconnaissance of the gold fields of southern Alaska with some notes on general geology, 1898

Becker, G. F., 1898, Reconnaissance of the gold fields of southern Alaska with some notes on general geology: U.S. Geological Survey Annual Report 0018, p. 1-86, 6 sheets, scale unknown.
full-text PDF 1.5 MB
Hard Copy held by AVO at FBKS - CEC file cabinet

References

Recently active volcanoes of Alaska, 2023

Cameron, C.E., Bull, K.F., and Macpherson, A.E., 2023, Recently active volcanoes of Alaska: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 133 v. 6, 2 sheets. https://doi.org/10.14509/31086.

Alaska interagency operating plan for volcanic ash episodes, 2022

Alaska Volcano Observatory, National Oceanic and Atmospheric Administration, National Weather Service, Federal Aviation Administration, Department of Defense, United States Coast Guard, Division of Homeland Security and Emergency Management, Alaska Department of Environmental Conservation, and Alaska Department of Health and Social Services (participating agencies), 2022, Alaska interagency operating plan for volcanic ash episodes, 85 p.

Geologic database of information on volcanoes in Alaska (GeoDIVA), 2022

Cameron, C.E., Crass, S.W., and AVO Staff, eds, 2022, Geologic database of information on volcanoes in Alaska (GeoDIVA): Alaska Division of Geologic and Geophysical Surveys Digital Data Series 20, https://doi.org/10.14509/geodiva, https://doi.org/10.14509/30901.

Gas emissions from the Western Aleutians volcanic arc, 2021

Fischer, T.P., Lopez, T.M., Aiuppa, Alessandro, Rizzo, A.L., Ilanko, Tehnuka, Kelley, K.A., and Cottrell, Elizabeth, 2021, Gas emissions from the Western Aleutians volcanic arc: Frontiers in Earth Science, v. 9., 10.3389/feart.2021.786021.

Monochromatic long-period seismicity prior to the 2012 earthquake swarm at Little Sitkin Volcano, Alaska, 2021

Haney M.M., Buurman, Helena, Holtkamp Stephen, and McNutt, S.R., 2021, Monochromatic long-period seismicity prior to the 2012 earthquake swarm at Little Sitkin Volcano, Alaska: Frontiers in Earth Science, v. 9, article no. 689651, 13 p. https://doi.org/10.3389/feart.2021.689651.

Goals and development of the Alaska Volcano Observatory seismic network and application to forecasting and detecting volcanic eruptions, 2020

Power, J.A., Haney, M.M., Botnick, S.M., Dixon, J.P., Fee, David, Kaufman, A.M., Ketner, D.M., Lyons, J.J., Parker, Tom, Paskievitch, J.F., Read, C.W., Searcy, Cheryl, Stihler, S.D., Tepp, Gabrielle, and Wech, A.G., 2020, Goals and development of the Alaska Volcano Observatory seismic network and application to forecasting and detecting volcanic eruptions: Seismological Research Letters, doi: 10.1785/0220190216 .

Historically active volcanoes of Alaska, v. 4, 2020

Cameron, C.E., Schaefer, J.R., and Ekberg, P.G., 2020, Historically active volcanoes of Alaska: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 133 v. 4, 2 sheets. Http://doi.org/10.14509/30426

Major-oxide and trace-element geochemical data from rocks collected on Little Sitkin Island, from Little Sitkin Volcano, Alaska, 2020

Larsen, J.F., Neal, C.A., and Cameron, C.E., 2020, Major-oxide and trace-element geochemical data from rocks collected on Little Sitkin Island, from Little Sitkin Volcano, Alaska: Alaska Division of Geological & Geophysical Surveys Raw Data File 2020-4, 4 p. http://doi.org/10.14509/30440

Catalog of earthquake parameters and description of seismograph and infrasound stations at Alaskan volcanoes - January 1, 2013, through December 31, 2017, 2019

Dixon, J.P., Stihler S.D., Haney, M.M., Lyons, J.J., Ketner, D.M., Mulliken, K.M., Parker, T., and Power, J.A., 2019, Catalog of earthquake parameters and description of seismograph and infrasound stations at Alaskan volcanoes - January 1, 2013, through December 31, 2017: U.S. Geological Survey Data Series 1115, 92 p., https://doi.org/10.3133/ds1115.

A unified catalog of earthquake hypocenters and magnitudes at volcanoes in Alaska: 1989 to 2018, 2019

Power, J.A., Friberg, P.A., Haney, M.M., Parker, T., Stihler, S.D., and Dixon, J.P., 2019, A unified catalog of earthquake hypocenters and magnitudes at volcanoes in Alaska—1989 to 2018: U.S. Geological Survey Scientific Investigations Report 2019–5037, 17 p., https://doi.org/10.3133/sir20195037.

2018 update to the U.S. Geological Survey national volcanic threat assessment, 2018

Ewert, J.W., Diefenbach, A.K., and Ramsey, D.W., 2018, 2018 update to the U.S. Geological Survey national volcanic threat assessment: U.S. Geological Survey Scientific Investigations Report 2018-5140, 40 p., https://pubs.usgs.gov/sir/2018/5140/sir20185140.pdf.

Historically active volcanoes of Alaska, v. 3, 2018

Cameron, C.E., Schaefer, J.R., and Mulliken, K.M., 2018, Historically active volcanoes of Alaska: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 133 v. 3, 2 sheets. Http://doi.org/10.14509/30142

Historically active volcanoes of Alaska, 2016

Cameron, C.E., and Schaefer, J.R., 2016, Historically active volcanoes of Alaska: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 133 v. 2, 1 sheet, scale 1:3,000,000. http://doi.org/10.14509/20181

Alaska Volcano Observatory image database, 2016

Cameron, C.E., and Snedigar, S.F., 2016, Alaska Volcano Observatory image database: Alaska Division of Geological & Geophysical Surveys Digital Data Series 13, https://www.avo.alaska.edu/images/. https://doi.org/10.14509/29689.

Aleutian arc geothermal fluids: chemical analyses of waters and gases, 2015

Evans, W.C., Bergfeld, D., Neal, C.A., McGimsey, R.G., Werner, C.A., Waythomas, C.F., Lewicki, J.L., Lopez, T., Mangan, M.T., Miller, T.P., Diefenbach, A., Schaefer, J., Coombs, M.L., Wang, B., Nicolaysen, K., Izbekov, P., Maharrey, Z., Huebner, M., Hunt, A.G., Fitzpatrick, J., and Freeburg, G., 2015, Aleutian Arc geothermal fluids: chemical analyses of waters and gases: U.S. Geological Survey Data release, http://dx.doi.org/10.5066/F74X55VB

Historically active volcanoes of Alaska, 2014

Schaefer, J.R., Cameron, C.E., and Nye, C.J., 2014, Historically active volcanoes of Alaska: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 133 v. 1.2, 1 sheet, scale 1:3,000,000. This publication has been superseded. Newest version available at http://www.dggs.alaska.gov/pubs/id/20181 .

Regional controls on volcano seismicity along the Aleutian Arc, 2014

Buurman, Helena, Nye, C.J., West, M.E., and Cameron, Cheryl, 2014, Regional controls on volcano seismicity along the Aleutian Arc: Geochemistry, Geophysics, Geosystems, doi:10.1002/2013GC005101

2012 Volcanic activity in Alaska: Summary of events and response of the Alaska Volcano Observatory, 2014

Herrick, J.A., Neal, C.A., Cameron, C.E., Dixon, J.P., and McGimsey, R.G., 2014, 2012 Volcanic activity in Alaska: Summary of events and response of the Alaska Volcano Observatory: U.S. Geological Survey Scientific Investigations Report 2014-5160, 82p., http://dx.doi.org/10.3133/sir20145160.

Preliminary database of Quaternary vents in Alaska, 2014

Cameron, C.E., and Nye, C.J., 2014, Preliminary database of Quaternary vents in Alaska: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 153, 11 p., doi:10.14509/27357 .

InSAR imaging of Aleutian volcanoes, 2014

Lu, Zhong, and Dzurisin, Daniel, 2014, InSAR imaging of Aleutian volcanoes: Chichester, UK, Springer-Praxis, 390 p.

Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2012, 2013

Dixon, J.P., Stihler, S.D, Power, J.A., Haney, Matt, Parker, Tom, Searcy, C.K., and Prejean, Stephanie, 2013, Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2012: U.S. Geological Survey Data Series 789, 84 p., available at http://pubs.usgs.gov/ds/789/ .
full-text pdf 6.5 MB

Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2011, 2012

Dixon, J.P., Stihler, S.D., Power, J.A., and Searcy, C.K., 2012, Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2011: U.S. Geological Survey Data Series 730, 82 p., available online at http://pubs.usgs.gov/ds/730/pdf/ds730.pdf .

Review of crustal seismicity in the Aleutian Arc and implications for arc deformation, 2012

Ruppert, N.A., Kozyreva, N.P., and Hansen, R.A., 2012, Review of crustal seismicity in the Aleutian Arc and implications for arc deformation: Tectonophysics, v. 522-523, p. 150-157, doi:10.1016/j.tecto.2011.11.024 .

Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2010, 2011

Dixon, J.P., Stihler, S.D., Power, J.A., and Searcy, C.K., 2011, Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2010: U.S. Geological Survey Data Series 645, 82 p., available online at http://pubs.usgs.gov/ds/645/

Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2009, 2010

Dixon, J.P., Stihler, S.D., Power, J.A., and Searcy, C.K., 2010, Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2009: U.S. Geological Survey Data Series 531, 84 p., available online at http://pubs.usgs.gov/ds/531/ .

Subduction controls of Hf and Nd isotopes in lavas of the Aleutian island arc, 2010

Yogodzinski, G.M., Vervoort, J.D., Brown, S.T., and Gerseny, M., 2010. Subduction controls of Hf and Nd isotopes in lavas of the Aleutian island arc: Earth and Planetary Science Letters, v. 300, p. 226-238, doi: 10.1016/j.epsl.2010.09.035 .

Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2008, 2009

Dixon, J.P., and Stihler, S.D., 2009, Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2008: U.S. Geological Survey Data Series 467, 88 p., available at http://pubs.usgs.gov/ds/467/ .

Preliminary spreadsheet of eruption source parameters for volcanoes of the world, 2009

Mastin, L.G., Guffanti, Marianne, Ewert, J.E., and Spiegel, Jessica, 2009, Preliminary spreadsheet of eruption source parameters for volcanoes of the world: U.S. Geological Survey Open-File Report 2009-1133, v. 1.2, 25 p., available at http://pubs.usgs.gov/of/2009/1133/ .

Historically active volcanoes of Alaska reference deck, 2009

Snedigar, S.F., and Cameron, C.C., 2009, Historically active volcanoes of Alaska reference deck: Alaska Division of Geological & Geophysical Surveys Information Circular 59, 52 p, available to order from http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=20401 .

Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2006, 2008

Dixon, J.P., Stihler, S.D., Power, J.A., and Searcy, Cheryl, 2008, Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2006: U.S. Geological Survey Data Series 326, 79 p., available at http://pubs.usgs.gov/ds/326/ .

The Alaska Volcano Observatory - 20 years of volcano research, monitoring, and eruption response, 2008

Schaefer, J.R., and Nye, Chris, 2008, The Alaska Volcano Observatory - 20 years of volcano research, monitoring, and eruption response: Alaska Division of Geological & Geophysical Surveys, Alaska GeoSurvey News, NL 2008-001, v. 11, n. 1, p. 1-9, available at http://wwwdggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=16061 .

Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2007, 2008

Dixon, J.P., Stihler, S.D. and Power, J.A., 2008, Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2007: U.S. Geological Survey Data Series 367, 82 p., available online at http://pubs.usgs.gov/ds/367/ .

System for ranking relative threats of U.S. volcanoes, 2007

Ewert, John, 2007, System for ranking relative threats of U.S. volcanoes: Natural Hazards Review, v. 8, n. 4, p. 112-124.

Along-strike trace element and isotopic variation in Aleutian Island arc basalt: subduction melts sediments and dehydrates serpentine, 2007

Singer, B.S., Jicha, B.R., Leeman, W.P., Rogers, N.W., Thirlwall, M.F., Ryan, Jeff, and Nicolaysen, K.E., 2007, Along-strike trace element and isotopic variation in Aleutian Island arc basalt: subduction melts sediments and dehydrates serpentine: Journal of Geophysical Research, v. 112, n. B6, 26 p., doi: 10.1029/2006JB004897 .

Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2005, 2006

Dixon, J.P., Stihler, S.D., Power, J.A., Tytgat, Guy, Estes, Steve, and McNutt, S.R., 2006, Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2005: U.S. Geological Survey Open-File Report 2006-1264, 78 p., available at http://pubs.usgs.gov/of/2006/1264/ .

Digital data for the reconnaissance geologic map of the western Aleutian islands, Alaska, 2006

Wilson, F.H., Mohadjer, Solmaz, Labay, K.A., Shew, Nora, and Grey, D.M., 2006, Digital data for the reconnaissance geologic map of the western Aleutian islands, Alaska: U.S. Geological Survey Open-File Report 2006-1302, 1 p., available online at http://pubs.usgs.gov/of/2006/1302/

An assessment of volcanic threat and monitoring capabilities in the United States: framework for a National Volcano Early Warning System NVEWS, 2005

Ewert, J.W., Guffanti, Marianne, and Murray, T.L., 2005, An assessment of volcanic threat and monitoring capabilities in the United States: framework for a National Volcano Early Warning System NVEWS: U.S. Geological Survey Open-File Report 2005-1164, 62 p.
full-text PDF 2.90 MB

March-April 2005, 2005

Alaska Volcano Observatory, 2005, March-April 2005: Alaska Volcano Observatory Bimonthly report, v. 17, n. 2, unpaged, http://www.avo.alaska.edu/avobm/avo_info.php?volume=17&number=2.

Volcanoes of the world: an illustrated catalog of Holocene volcanoes and their eruptions, 2003

Siebert, L., and Simkin, T., 2002-, Volcanoes of the world: an illustrated catalog of Holocene volcanoes and their eruptions: Smithsonian Institution, Global Volcanism Program Digital Information Series GVP-3, http://volcano.si.edu/search_volcano.cfm, unpaged internet resource.

Bibliography of information on Alaska volcanoes, 2003

Cameron, C. E., Triplehorn, J. H., and Robar, C. L., 2003, Bibliography of information on Alaska volcanoes: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication MP 131, 1 CD-ROM.
Hard Copy held by AVO at FBKS - CEC file cabinet

Historically active volcanoes of the Aleutian Arc, 2002

Schaefer, Janet, and Nye, C. J., 2002, Historically active volcanoes of the Aleutian Arc: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication MP 0123, unpaged, 1 sheet, scale 1:3,000,000. Superceded by Miscellaneous Publication 133: http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=20181

Historically active volcanoes in Alaska, a quick reference, 2000

Wallace, K. L., McGimsey, R. G., and Miller, T. P., 2000, Historically active volcanoes in Alaska, a quick reference: U.S. Geological Survey Fact Sheet FS 0118-00, 2 p.
full-text PDF 162 KB
Hard Copy held by AVO at FBKS - CEC file cabinet

Encyclopedia of volcanoes, 2000

Sigurdsson, Haraldur, (ed.), 2000, Encyclopedia of volcanoes: San Diego, CA, Academic Press, 1417 p.

Volcanoes of Alaska, 1998

Nye, C. J., Queen, Katherine, and McCarthy, A. M., 1998, Volcanoes of Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular IC 0038, unpaged, 1 sheet, scale 1:4,000,000, available at http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=7043 .
Hard Copy held by AVO at FBKS - CEC shelf

Catalog of the historically active volcanoes of Alaska, 1998

Miller, T. P., McGimsey, R. G., Richter, D. H., Riehle, J. R., Nye, C. J., Yount, M. E., and Dumoulin, J. A., 1998, Catalog of the historically active volcanoes of Alaska: U.S. Geological Survey Open-File Report 98-0582, 104 p.
Hard Copy held by AVO at FBKS - CEC shelf

Quick reference to Alaska's active volcanoes and listing of historical eruptions, 1760-1994, 1995

McGimsey, R. G., and Miller, T. P., 1995, Quick reference to Alaska's active volcanoes and listing of historical eruptions, 1760-1994: U.S. Geological Survey Open-File Report 95-0520, 13 p.
Hard Copy held by AVO at FBKS - CEC file cabinet

Volcanoes of Alaska, 1995

Alaska Division of Geological & Geophysical Surveys, 1995, Volcanoes of Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular IC 0038, unpaged, 1 sheet, scale 1:4,000,000.

Aleutian magmas in space and time, 1994

Kay, S. M., and Kay, R. W., 1994, Aleutian magmas in space and time: in Plafker, George and Berg, H. C., (eds.), The Geology of Alaska, Geological Society of America The Geology of North America series v. G-1, p. 687-722.
Hard Copy held by AVO at FBKS - CEC file cabinet

Timing of large Holocene volcanic events in the western Aleutian Arc, Alaska, 1994

Miller, T. P., and Kiriyanov, V. Y., 1994, Timing of large Holocene volcanic events in the western Aleutian Arc, Alaska [abs.]: Eos, v. 75, n. 44, p. 731.
Hard Copy held by AVO at FBKS - CEC file cabinet

Volcanoes of the world [2nd edition], 1994

Simkin, Tom, and Siebert, Lee, 1994, Volcanoes of the world [2nd edition]: Tucson, Arizona, Geoscience Press, 349 p.
Hard Copy held by AVO at FBKS - CEC shelf

Geothermal resources of Alaska, 1994

Miller, T. P., 1994, Geothermal resources of Alaska: in Plafker, George and Berg, H. C., (eds.), The Geology of Alaska, Geological Society of America The Geology of North America series v. G-1, p. 979-987.
Hard Copy held by AVO at FBKS - CEC file cabinet Hard Copy held by AVO at FBKS - CEC shelf

The geology, geochemistry and petrology of the recent magmatic phase of the central and western Aleutian Arc, 1994

Myers, J. D., 1994, The geology, geochemistry and petrology of the recent magmatic phase of the central and western Aleutian Arc: unpublished manuscript unpaged.
Hard Copy held by AVO at FBKS - CEC shelf

Age, character, and significance of Aleutian arc volcanism, 1994

Fournelle, J. H., Marsh, B. D., and Myers, J. D., 1994, Age, character, and significance of Aleutian arc volcanism: in Plafker, George and Berg, H. C., (eds.), The Geology of Alaska, Geological Society of America The Geology of North America Series v. G-1, p. 723-758.

Aleutian arc volcanoes, 1994

Nye, C. J., 1994, Aleutian arc volcanoes: Alaska Division of Geological & Geophysical Surveys Public-Data File PDF 94-54, unpaged, 1 sheet, scale 1:2,126,841.

Aleut dictionary, Unangam Tunudgusii, an unabridged lexicon of the Aleutian, Pribilof, and Commander Islands Aleut language, 1994

Bergsland, Knut, comp., 1994, Aleut dictionary, Unangam Tunudgusii, an unabridged lexicon of the Aleutian, Pribilof, and Commander Islands Aleut language: University of Alaska Fairbanks, Alaska Native Language Center, 739 p.

Geothermal resources of the Aleutian Arc, 1993

Motyka, R. J., Liss, S. A., Nye, C. J., and Moorman, M. A., 1993, Geothermal resources of the Aleutian Arc: Alaska Division of Geological & Geophysical Surveys Professional Report PR 0114, 17 p., 4 sheets, scale 1:1,000,000.
Hard Copy held by AVO at FBKS - CEC shelf

Holocene volcanoes of the Aleutian Arc, Alaska, 1993

March, G. D., 1993, Holocene volcanoes of the Aleutian Arc, Alaska: Alaska Division of Geological & Geophysical Surveys Public-Data File PDF 93-85, unpaged, 1 sheet, scale 1:2,000,000.

Volcanoes of North America: United States and Canada, 1990

Wood, C. A., and Kienle, Juergen, (eds.), 1990, Volcanoes of North America: United States and Canada: New York, Cambridge University Press, 354 p.
Hard Copy held by AVO at FBKS - CEC shelf

Historical unrest at large calderas of the world, 1988

Newhall, C.G., and Dzurisin, Daniel, 1988, Historical unrest at large calderas of the world: U.S. Geological Survey Bulletin 1855, v. 1-2, 1108 p.
Hard Copy held by AVO at FBKS - CEC shelf

Identification of endmembers for magma fixing in Little Sitkin volcano, Alaska, 1987

Wolf, D. A., 1987, Identification of endmembers for magma fixing in Little Sitkin volcano, Alaska: State University of New York at Albany unpublished M.S. thesis, 201 p.

Map showing distribution, composition, and age of Late Cenozoic volcanic centers in Alaska, 1986

Luedke, R. G., and Smith, R. L., 1986, Map showing distribution, composition, and age of Late Cenozoic volcanic centers in Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I 1091-F, unpaged, 3 sheets, scale 1:1,000,000.

Isotopic studies of continental and marine sediments and igneous rocks of the Aleutian Island Arc, 1986

Goldstein, S.L., 1986, Isotopic studies of continental and marine sediments and igneous rocks of the Aleutian Island Arc: Columbia University Ph.D. dissertation, 357 p.
Hard Copy held by AVO at FBKS - CEC file cabinet

Hf-Nd-Sr isotopes and incompatible element abundances in island arcs: implications for magma origins and crust-mantle evolution, 1984

White, W. M., Parchett, J., 1984, Hf-Nd-Sr isotopes and incompatible element abundances in island arcs: implications for magma origins and crust-mantle evolution: Earth and Planetary Science Letters, v. 67, n. 2, p. 167-185.
Hard Copy held by AVO at FBKS - CEC file cabinet

The Aleutians, 1982

Marsh, B. D., 1982, The Aleutians: in Thorpe, R. S., (ed.), Andesites: orogenic andesites and related rocks, Chichester, United Kingdom, John Wiley & Sons, p. 99-114.
Hard Copy held by AVO at FBKS - CEC file cabinet

Volcanoes of the world, 1981

Simkin, Tom, Siebert, Lee, McClelland, Lindsay, Bridge, David, Newhall, Christopher, and Latter, J. H., 1981, Volcanoes of the world: Stroudsburg, PA, Hutchinson Publishing Company, 233 p.

Magmatic evolution of Little Sitkin and Semisopochnoi volcanoes, Alaska, 1980

Ach, J. A., and DeLong, S. E., 1980, Magmatic evolution of Little Sitkin and Semisopochnoi volcanoes, Alaska [abs.]: Eos, v. 61, n. 46, p. 1140.

Geothermal energy resources of Alaska, 1980

Turner, D. L., Forbes, R. B., Albanese, Mary, Macbeth, Joyce, Lockhart, A. B., and Seed, S. M., 1980, Geothermal energy resources of Alaska: University of Alaska Fairbanks Geophysical Institute Report UAG-R 279, 19 p., 3 sheets, scale 1 at 1:2,500,000.

Igneous-related geothermal systems, 1979

Smith, R. L., and Shaw, H. R., 1979, Igneous-related geothermal systems: in Muffler, L. J. P., (ed.), Assessment of geothermal resources of the United States 1978, U.S. Geological Survey Circular C 790, p. 12-17.

Assessment of geothermal resources of the United States--1978, 1979

Muffler, L. J. P., 1979, Assessment of geothermal resources of the United States--1978: U.S. Geological Survey Circular C 0790, 163 p.
Hard Copy held by AVO at FBKS - CEC shelf

Comprehensive tables giving physical data and thermal energy estimates for young igneous systems of the United States, 1978

Smith, R. L., Shaw, H. R., Luedke, R. G., and Russell, S. L., 1978, Comprehensive tables giving physical data and thermal energy estimates for young igneous systems of the United States: U.S. Geological Survey Open-File Report 78-0925, p. 1-25.
Hard Copy held by AVO at FBKS - CEC shelf

Geology of Little Sitkin Island, Alaska, 1959

Snyder, G. L., 1959, Geology of Little Sitkin Island, Alaska: in Investigations of Alaskan volcanoes, U.S. Geological Survey Bulletin 1028-H, p. 169-210, 1 plate, scale 1:20,000.
Hard Copy held by AVO at FBKS - CEC shelf

Selenium content of some volcanic rocks from Western United States and Hawaiian Islands, 1959

Davidson, D. F., and Powers, H. A., 1959, Selenium content of some volcanic rocks from Western United States and Hawaiian Islands: U.S. Geological Survey Bulletin 1084-C, p. 69-81.

Alaska Peninsula-Aleutian Islands, 1958

Powers, H. A., 1958, Alaska Peninsula-Aleutian Islands: in Williams, H., (ed.), Landscapes of Alaska, Los Angeles, CA, University of California Press, p. 61-75.

Ocean floor structures, northeastern Rat Islands, Alaska, 1957

Snyder, G. L., 1957, Ocean floor structures, northeastern Rat Islands, Alaska: in Investigations of Alaskan volcanoes, U.S. Geological Survey Bulletin 1028-G, p. 161-167, 1 plate, scale 1:125,000.
full-text PDF 325 KB
plate 22 PDF 5.6 MB
Hard Copy held by AVO at FBKS - CEC shelf

Reconnaissance geology of some western Aleutian Islands, Alaska, 1956

Coats, R. R., 1956, Reconnaissance geology of some western Aleutian Islands, Alaska: in Investigations of Alaskan volcanoes, U.S. Geological Survey Bulletin 1028-E, p. 83-100, 1 sheet, scale unknown.
full-text PDF 4.4 MB
plate 17 PDF 1.6 MB

Configuration of the Aleutian Ridge: Rat Islands-Semisopochnoi I. to west of Buldir I., 1953

Gibson, William, and Nichols, H., 1953, Configuration of the Aleutian Ridge: Rat Islands-Semisopochnoi I. to west of Buldir I.: Abstracts with Programs - Geological Society of America, v. 64, n. 10, p. 1173-1188, 2 sheets, scale unknown.

Volcanic activity in the Aleutian Arc, 1950

Coats, R. R., 1950, Volcanic activity in the Aleutian Arc: U.S. Geological Survey Bulletin 0974-B, p. 35-49, 1 sheet, scale 1:5,000,000.
plate 1 PDF 819 KB
full-text PDF 783 KB
Hard Copy held by AVO at FBKS - CEC shelf

Reconnaissance geology of some western Aleutian Islands, 1947

Coats, R. R., 1947, Reconnaissance geology of some western Aleutian Islands: U.S. Geological Survey Alaskan Volcano Investigations Report 0002, p. 95-105.
Hard Copy held by AVO at FBKS - CEC shelf

United States coast pilot, Alaska Part 2, Yakutat Bay to Arctic Ocean, 1947

U.S. Department of Commerce, and Coast and Geodetic Survey, 1947, United States coast pilot, Alaska Part 2, Yakutat Bay to Arctic Ocean: Washington DC, United States Government Printing Office, 659 p.

The volcanoes of Alaska, 1910

Cordeiro, F. J. B., 1910, The volcanoes of Alaska: Appalachia, v. 12, p. 130-135.
Hard Copy held by AVO at FBKS - CEC file cabinet

Reported volcanic eruptions in Alaska, Puget Sound, etc., 1690-1896, 1898

Plummer, F. G., 1898, Reported volcanic eruptions in Alaska, Puget Sound, etc., 1690-1896: in Holden, E. S., (ed.), A Catalogue of Earthquakes on the Pacific Coast 1769-1897, Smithsonian Institution Miscellaneous Collections 1087, City of Washington D.C., Smithsonian Institution, p. 24-27.
Hard Copy held by AVO at FBKS - CEC file cabinet

Reconnaissance of the gold fields of southern Alaska with some notes on general geology, 1898

Becker, G. F., 1898, Reconnaissance of the gold fields of southern Alaska with some notes on general geology: U.S. Geological Survey Annual Report 0018, p. 1-86, 6 sheets, scale unknown.
full-text PDF 1.5 MB
Hard Copy held by AVO at FBKS - CEC file cabinet

The volcanic region of Alaska, 1884

Petroff, Ivan, 1884, The volcanic region of Alaska: in Population, Industries, and Resources of Alaska, Washington DC, Government Printing Office, p. 93-96.
full-text PDF 10.9 MB
Hard Copy held by AVO at FBKS - CEC file cabinet

Alaska and its resources, 1870

Dall, W. H., 1870, Alaska and its resources: Boston, Lee and Shepard, 627 p.
Hard Copy held by AVO at FBKS - CEC file cabinet

Documents sur les tremblements de terre et les phenomenes volcaniques des iles Aleutiennes, de la peninsule d'Aljaska et de la cote no. d'Amerique, Extrait des memoires de l'Academie des sciences, arts et belles-lettres de Dijon, 1865, 1866

Perrey, Alexis, 1866, Documents sur les tremblements de terre et les phenomenes volcaniques des iles Aleutiennes, de la peninsule d'Aljaska et de la cote no. d'Amerique, Extrait des memoires de l'Academie des sciences, arts et belles-lettres de Dijon, 1865: Dijon, J.E. Rabutut, 131 p.
Hard Copy held by AVO at FBKS - CEC file cabinet

Grewingk's geology of Alaska and the Northwest Coast of America [edited by Marvin W. Falk, translation by Fritz Jaensch published 2003], 1850

Grewingk, Constantine, 1850, Grewingk's geology of Alaska and the Northwest Coast of America [edited by Marvin W. Falk, translation by Fritz Jaensch published 2003]: Rasmuson Library Historical Translation Series 11, Fairbanks, AK, The University of Alaska Press, 242 p.
Hard Copy held by AVO at FBKS - CEC shelf

Past volcanic activity in the Aleutian arc,

Coats, R. R., Past volcanic activity in the Aleutian arc: U.S. Geological Survey Volcano Investigations Report 1, 18 p.
full-text PDF 22.3 MB
Hard Copy held by AVO at FBKS - CEC file cabinet

Ash Forecasting

Mathematical models developed by the USGS forecast various aspects of how a volcanic ash plume will interact with wind—where, how high, and how fast ash particles will be transported in the atmosphere, as well as where ash will fall out and accumulate on the ground. AVO runs these models when a volcano is restless by assuming a reasonable hypothetical eruption, to provide a pre-eruptive forecast of areas likely to be affected. During an ongoing eruption, AVO will update the forecast with actual observations (eruption start time and duration, plume height) as they become available.

View the current airborne ash cloud models for Little Sitkin

Ashfall thickness forecast

The Ash3d model was developed by the USGS to forecast how a volcanic ash plume will interact with wind and where ash will fall out and accumulate on the ground. AVO runs these models twice daily when a volcano is restless by assuming a reasonable hypothetical eruption altitude and duration. The map shows the model results of ashfall thickness for areas that are likely to be affected, if one were to occur. During an ongoing eruption, AVO will update the forecast with actual observations (eruption start time and duration, plume height) as they become available, and these plots will be automatically updated. The National Weather Service Anchorage Forecast Office will issue the official ashfall warning product and post them at weather.gov/afc

THESE PRODUCTS MAY NOT BE CURRENT.

During an actual eruption, see National Weather Service forecasts of ashfall:https://weather.gov/afc.

Ashfall Forecast

Click on the X on the graphic (upper right) to expand the map to show the map legend.

Ashfall Start Time

This map shows the modeled estimate of the time it would take for ashfall to begin following an eruption. It corresponds to the ashfall thickness forecast map shown above. This map uses the start time of either the twice-daily hypothetical model runs (time shown in the legend) or the actual eruption start time (if one were to occur). In the case of an actual eruption, the National Weather Service Anchorage Forecast Office will issue the official ashfall warning product that includes the ashfall start time and post them at weather.gov/afc

THESE PRODUCTS MAY NOT BE CURRENT.

During an actual eruption, see National Weather Service forecasts of ashfall:https://weather.gov/afc.

Ashfall Start Times Forecast

Click on the X on the graphic (upper right) to expand the map to show the map legend.
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