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About AVO

Coombs, Michelle

Michelle has been a Research Geologist for USGS-AVO in Anchorage since 2004. Her work includes research on a wide variety of topics in geology, petrology, and geochemistry, as well as geologic mapping and hazards assessment. Recent and current research interests include (1) timing and generation of explosive silicic eruptions at Alaskan volcanoes, especially Augustine and Hayes; (2) refined edifice mapping and eruptive history of Akutan, Spurr, and Redoubt volcanoes; and (3) combining petrologic study with detailed eruption chronologies to elucidate processes of magma generation and eruption triggering at dome-forming volcanoes such as Redoubt and Augustine. From March 2016 to May 2023, Michelle was the Scientist-in-Charge for AVO. Prior to 2004, she worked for the USGS in Menlo Park, CA, where her research focused on the geochemistry, petrology, and submarine geology of Hawaiian volcanoes.

Website: http://profile.usgs.gov/mcoombs

Discipline(s): Geochemistry, Geochronology, Geology, Petrology, Tephra

References:

Tephra samples and analyses from Cook Inlet source volcanoes and Anchor Point, Alaska, 2024

Loewen, M.W., Wallace, Kristi, Coombs, M.L., and Mulliken, K.M., 2023, Tephra samples and analyses from Cook Inlet source volcanoes and Anchor Point, Alaska: Alaska Division of Geological & Geophysical Surveys Raw Data File 2023-25, 4 p. https://doi.org/10.14509/31090

Probabilistic source classification of large tephra producing eruptions using supervised machine learning - an example from the Alaska-Aleutian Arc, 2023

Lubbers, J., Loewen, M., Wallace, K., Coombs, M., and Addison, J., 2023, Probabilistic source classification of large tephra producing eruptions using supervised machine learning - an example from the Alaska-Aleutian Arc: Geochemistry, Geophysics, Geosystems v. 24, no. 11, e2023GC011037. https://doi.org/10.1029/2023GC011037.

Eruption of compositionally heterogeneous andesites from a complex storage region during the 2006 eruption of Augustine Volcano, 2021

Benage, M.C., Wright, H.M.N., and Coombs, M.L., 2021, Eruption of compositionally heterogeneous andesites from a complex storage region during the 2006 eruption of Augustine Volcano: Bulletin of Volcanology, v. 83, n. 17, 23 p., doi:10.1007/s00445-020-01431-2.

Generation of calc-alkaline magmas during crystallization at high oxygen fugacity: an experimental and petrologic study of tephras from Buldir Volcano, western Aleutian arc, Alaska, USA, 2020

Waters, L.E., Cottrell, Elizabeth, Coombs, M.L., and Kelley, K.A., 2020, Generation of calc-alkaline magmas during crystallization at high oxygen fugacity: an experimental and petrologic study of tephras from Buldir Volcano, western Aleutian arc, Alaska, USA: Journal of Petrology, p. 1-36, doi:10.1093/petrology/egaa104.

Phase equilibrium of a high SiO2 andesite at fO2=RRO - Implications for Augustine Volcano and other high fO2 arc andesites, 2020

De Angelis, S.H., Larsen, J.F., Coombs, M.L., Utley, J.E.P., and Dunn, Andrew, 2020, Phase equilibrium of a high SiO2 andesite at fO2=RRO - Implications for Augustine Volcano and other high fO2 arc andesites: Contributions to Mineralogy and Petrology, v. 175, no. 24, 20 p., https://doi.org/10.1007/s00410-020-1663-6.

Phase equlibrium of a high-SiO2 andesite at fO2=RRO: implications for Augustine Volcano and other high-fO2 arc andesites, 2020

De Angelis, S.H., Larsen, J.F., Coombs, M.L., Utley, J.E.P., and Dunn, Andrew, 2020, Phase equlibrium of a high-SiO2 andesite at fO2=RRO: implications for Augustine Volcano and other high-fO2 arc andesites: Contributions to Mineralogy and Petrology, v. 175, n. 24, 21 p., doi: https://doi.org/10.1007/s00410-020-1663-6.

The eruptive history, magmatic evolution, and influence of glacial ice at long-lived Akutan volcano, eastern Aleutian Islands, Alaska, 2020

Coombs, M.L., and Jicha, B.R., 2020, The eruptive history, magmatic evolution, and influence of glacial ice at long-lived Akutan volcano, eastern Aleutian Islands, Alaska: GSA Bulletin, 29 p., https://doi.org/10.1130/B35667.1.

Overview, chronology, and impacts of the 2016-2017 eruption of Bogoslof volcano, Alaska, 2019

Coombs, Michelle, Wallace, Kristi, Cameron, Cheryl, Lyons, John, Wech, Aaron, Angeli, Kim, and Cervelli, Peter, 2019, Overview, chronology, and impacts of the 2016-2017 eruption of Bogoslof volcano, Alaska: Bulletin of Volcanology, v, 81, n. 62, doi:10.1007/s00445-019-1322-9.

Petrology of the 2016-2017 eruption of Bogoslof Island, Alaska, 2019

Loewen, M.L., Izbekov, Pavel, Moshrefzadeh, Jamshid, Coombs, Michelle, Larsen, Jessica, Graham, Nathan, Waythomas, Christopher, and Wallace, Kristi, 2019, Petrology of the 2016-2017 eruption of Bogoslof Island, Alaska: Bulletin of Volcanology v. 81, n. 72, 20 p., doi:10.1007/s00445-019-1333-6.

Postglacial eruptive history and geochemistry of Semisopochnoi volcano, western Aleutian Islands, Alaska, 2018

Coombs, M.L., Larsen, J.F., and Neal, C.A., 2018, Postglacial eruptive history and geochemistry of Semisopochnoi volcano, western Aleutian Islands, Alaska: U.S. Geological Survey Scientific Investigations Report 2017-5150, 32 p., https://doi.org/10.3133/sir20175150.

Short-term forecasting and detection of explosions during the 2016-2017 eruption of Bogoslof Volcano, Alaska, 2018

Coombs, M.L., Wech, A.G., Haney, M.M., Lyons, J.J., Schneider, D.J., Schwaiger, H.F., Wallace, K.L., Fee, David, Freymueller, J.T., Schaefer, J.R., and Tepp, Gabrielle, 2018, Short-term forecasting and detection of explosions during the 2016-2017 eruption of Bogoslof Volcano, Alaska: Frontiers in Earth Science, v. 6, article 122, doi: 10.3389/feart.2018.00122 .

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

Amphibole reaction rims as a record of pre-eruptive magmatic heating: an experimental approach, 2015

De Angelis, S.H., Larsen, J., Coombs, M., Dunn, A., and Hayden, L., 2015, Amphibole reaction rims as a record of pre-eruptive magmatic heating: an experimental approach: Earth and Planetary Science Letters, v. 426, p. 235-245, doi:10.1016/j.epsl.2015.06.051

Cogenetic late Pleistocene rhyolite and cumulate diorites from Augustine Volcano revealed by SIMS 238U-230Th dating of zircon, and implications for silicic magma generation by extraction from mush, 2014

Coombs, M.L., and Vazquez, J.A., 2014, Cogenetic late Pleistocene rhyolite and cumulate diorites from Augustine Volcano revealed by SIMS 238U-230Th dating of zircon, and implications for silicic magma generation by extraction from mush: Geochemistry, Geophysics, Geosystems, v. 15, 20 p., doi:10.1002/2014GC005589

Significance of a near-source tephra-stratigraphic sequence to the eruptive history of Hayes Volcano, south-central Alaska, 2014

Wallace, K.L., Coombs, M.L., Hayden, L.A., and Waythomas, C.F., 2014, Significance of a near-source tephra-stratigraphic sequence to the eruptive history of Hayes Volcano, south-central Alaska: U.S. Geological Survey Scientific Investigations Report 2014-5133, 32 p., available online at: http://pubs.usgs.gov/sir/2014/5133/
full-text PDF 864 KB

Andesites of the 2009 eruption of Redoubt Volcano, Alaska, 2013

Coombs, M.L., Sisson, T.W., Bleick, H.A., Henton, S.M., Nye, C.J., Payne, A.L., Cameron, C.E., Larsen, J.F., Wallace, K.L., and Bull, K.F., 2013, Andesites of the 2009 eruption of Redoubt Volcano, Alaska: Journal of Volcanology and Geothermal Research, v. 259, p. 349-372, doi:10.1016/j.jvolgeores.2012.01.002

Character, mass, distribution, and origin of tephra-fall deposits from the 2009 eruption of Redoubt Volcano, Alaska - Highlighting the significance of particle aggregation, 2013

Wallace, K.L., Schaefer, J.R., and Coombs, M.L., 2013, Character, mass, distribution, and origin of tephra-fall deposits from the 2009 eruption of Redoubt Volcano, Alaska - Highlighting the significance of particle aggregation: Journal of Volcanology and Geothermal Research, v. 259, p. 145-169, doi:10.1016/j.jvolgeores.2012.09.015
full-text pdf 6.3 MB

High-resolution satellite and airborne thermal infrared imaging of precursory unrest and 2009 eruption at Redoubt Volcano, Alaska, 2013

Wessels, R.L., Vaughan, R.G., Patrick, M.R., and Coombs, M.L., 2013, High-resolution satellite and airborne thermal infrared imaging of precursory unrest and 2009 eruption at Redoubt Volcano, Alaska: Journal of Volcanology and Geothermal Research, v. 259, p. 248-269, doi:10.1016/j.jvolgeores.2012.04.014
full-text pdf 6.55 MB

Pre-eruptive magmatic conditions at Augustine Volcano, Alaska, 2006: evidence from amphibole geochemistry and textures, 2013

De Angelis, S.H., Larsen, Jessica, and Coombs, Michelle, 2013, Pre-eruptive magmatic conditions at Augustine Volcano, Alaska, 2006: evidence from amphibole geochemistry and textures: Journal of Petrology, v. 54, n. 9, p. 1939-1961, doi:10.1093/petrology/egt037

Volcano-ice interactions precursory to the 2009 eruption of Redoubt Volcano, Alaska, 2013

Bleick, H.A., Coombs, M.L., Cervelli, P.F., Bull, K.F., and Wessels, R.L., 2013, Volcano-ice interactions precursory to the 2009 eruption of Redoubt Volcano, Alaska: Journal of Volcanology and Geothermal Research, v. 259, p. 373-388, doi:10.1016/j.jvolgeores.2012.10.008
full-text pdf 4.6 MB

Geologic map of Mount Gareloi, Gareloi Island, Alaska, 2012

Coombs, M.L., McGimsey, R.G., and Browne, B.L., 2012, Geologic map of Mount Gareloi, Gareloi Island, Alaska: U.S. Geological Survey Scientific Investigations Map 3145, 18 p., 1 sheet, scale 1:24,000, available at http://pubs.usgs.gov/sim/3145/ .

Geology and 40Ar/39Ar geochronology of the medium- to high-K Tanaga volcanic cluster, western Aleutians, 2012

Jicha, B.R., Coombs, M.L., Calvert, A.T., and Singer, B.S., 2012, Geology and 40Ar/39Ar geochronology of the medium- to high-K Tanaga volcanic cluster, western Aleutians: Geological Society of America Bulletin, v. 124, n. 5/6, p. 842-856, doi:10.1130/B30472.1 .

Katmai scientific studies, 2012

Winfree, Robert, with contributions from Bacon, C.R., Bennett, A.J., Bennington, Ninfa, Berg, E.E., Brooks, Margi, Coletti, H.A., Coombs, M.L., Fierstein, Judy, Freeburg, Gary, Frost, G.V., Haney, Matthew, Jorgenson, M.T., Miller, A.E., Moran, Seth, Murphy, Rachel, Partnow, Patricia, Paskievitch, John, Stevens, D.P., Powell, Lee, Power, John, Prejean, S.G., Schaaf, Jeanne, Sherriff, R.L., Thurber, Clifford, and Welchman, R.A., 2012, Katmai science studies: Alaska Park Science Journal, v. 11, n. 1, 96 p., available online at http://www.nps.gov/akso/nature/science/ak_park_science/volume_11_issue_1.cfm .

The 2009 eruption of Redoubt Volcano, Alaska, 2012

Schaefer, J.R., ed., 2012, The 2009 eruption of Redoubt Volcano, Alaska, with contributions by Bull, Katharine, Cameron, Cheryl, Coombs, Michelle, Diefenbach, Angie, Lopez, Taryn, McNutt, Steve, Neal, Christina, Payne, Allison, Power, John, Schneider, Dave, Scott, William, Snedigar, Seth, Thompson, Glenn, Wallace, Kristi, Waythomas, Chris, Webley, Peter, and Werner, Cynthia: Alaska Division of Geological & Geophysical Surveys Report of Investigation 2011-5, 45 p., available at http://www.dggs.alaska.gov/pubs/id/23123.

Using rocks to reveal the inner workings of magma chambers below volcanoes in Alaska's National Parks, 2012

Coombs, M.L., and Bacon, C.R., 2012, Using rocks to reveal the inner workings of magma chambers below volcanoes in Alaska's National Parks: in Alaska: in Winfree, Robert (project lead), Katmai Science Studies: Alaska Park Science Journal, v. 11, n. 1, p. 26-33, available online at http://www.nps.gov/akso/nature/science/ak_park_science/volume_11_issue_1.cfm .

Volcano from space, 2011

Coombs, Michelle, 2011, Volcano from space, in Cook Inlet volcanoes: Frontier Scientists, WonderVisions, video, available at http://frontierscientists.com/category/cook_inlet_volcanoes/

Augustine Volcano; the influence of volatile components in magmas erupted A.D. 2006 to 2,100 years before present, 2010

Webster, J.D., Mandeville, C.W., Goldoff, Beth, Coombs, M.L., and Tappen, Christine, 2010, Augustine Volcano; the influence of volatile components in magmas erupted A.D. 2006 to 2,100 years before present, chapter 16 of Power, J.A., Coombs, M.L., and Freymueller, J.T., eds., The 2006 eruption of Augustine Volcano, Alaska: U.S. Geological Survey Professional Paper 1769, p. 383-423 [http://pubs.usgs.gov/pp/1769/chapters/p1769_chapter16.pdf].

High-resolution satellite and airborne thermal infrared imaging of the 2006 eruption of Augustine Volcano, 2010

Wessels, R.L., Coombs, M.L., Schneider, D.J., Dehn, Jonathan, and Ramsey, M.S., 2010, High-resolution satellite and airborne thermal infrared imaging of the 2006 eruption of Augustine Volcano, chapter 22 of Power, J.A., Coombs, M.L., and Freymueller, J.T., eds., The 2006 eruption of Augustine Volcano, Alaska: U.S. Geological Survey Professional Paper 1769, p. 527-552 [http://pubs.usgs.gov/pp/1769/chapters/p1769_chapter22.pdf].

Petrology and geochemistry of the 2006 eruption of Augustine Volcano, 2010

Larsen, J.F., Nye, C.J., Coombs, M.L., Tilman, Mariah, Izbekov, Pavel, and Cameron, Cheryl, 2010, Petrology and geochemistry of the 2006 eruption of Augustine Volcano, chapter 15 of Power, J.A., Coombs, M.L., and Freymueller, J.T., eds., The 2006 eruption of Augustine Volcano, Alaska: U.S. Geological Survey Professional Paper 1769, p. 335-382 and spreadsheets [http://pubs.usgs.gov/pp/1769/chapters/p1769_chapter15].

Pyroclastic flows, lahars, and mixed avalanches generated during the 2006 eruption of Augustine Volcano, 2010

Vallance, J.W., Bull, K.F., and Coombs, M.L., 2010, Pyroclastic flows, lahars, and mixed avalanches generated during the 2006 eruption of Augustine Volcano, chapter 10 of Power, J.A., Coombs, M.L., and Freymueller, J.T., eds., The 2006 eruption of Augustine Volcano, Alaska: U.S. Geological Survey Professional Paper 1769, p. 219-267 [http://pubs.usgs.gov/pp/1769/chapters/p1769_chapter10.pdf].

The 2006 eruption of Augustine Volcano, Alaska, 2010

Power, J.A., Coombs, M.L., and Freymueller, J.T., eds., 2010, The 2006 eruption of Augustine Volcano, Alaska: U.S. Geological Survey Professional Paper 1769, 667 p., 1 plate, scale 1:20,000, and data files. Available online at http://pubs.usgs.gov/pp/1769/ .

Timing, distribution, and volume of proximal products of the 2006 eruption of Augustine Volcano, 2010

Coombs, M.L., Bull, K.F., Vallance, J.W., Schneider, D.J., Thoms, E.E., Wessels, R.L., and McGimsey, R.G., 2010, Timing, distribution, and volume of proximal products of the 2006 Eruption of Augustine Volcano, chapter 8 of Power, J.A., Coombs, M.L., and Freymueller, J.T., eds., The 2006 eruption of Augustine Volcano, Alaska: U.S. Geological Survey Professional Paper 1769, p. 145-185, 1 plate, scale 1:20,000, and GIS data [http://pubs.usgs.gov/pp/1769/chapters/p1769_chapter08].

Augustine Volcano: Mg, Cr, and Ni-rich: LILE, REE, and HFSE-poor, 2008

Nye, C.J., Coombs, M.L., Larsen, J., Izbekov, P., Tilman, M., and Cameron, C., 2008, Augustine Volcano: Mg, Cr, and Ni-rich: LILE, REE, and HFSE-poor [abs.]: in Abstracts of the 18th Annual V.M. Goldschmidt Conference, Geochimica et Cosmochimica Acta, v. 72, n. 12S, p. A692.

Preliminary volcano-hazard assessment for Gareloi Volcano, Gareloi Island, Alaska, 2008

Coombs, M.L., McGimsey, R.G., and Browne, B.L., 2008, Preliminary volcano-hazard assessment for Gareloi Volcano, Gareloi Island, Alaska: U.S. Geological Survey Scientific Investigations Report 2008-5159, 29 p., 1 sheet, available at https://pubs.usgs.gov/sir/2008/5159/.

Massive edifice failure at Aleutian arc volcanoes, 2007

Coombs, M.L., White, S.M., and Scholl, D.W., 2007, Massive edifice failure at Aleutian arc volcanoes: Earth and Planetary Science Letters, v. 256, p. 403-418, doi: 10.1016/j.epsl.2007.01.030.

Preliminary volcano-hazard assessment for the Tanaga Volcanic Cluster, Tanaga Island, Alaska, 2007

Coombs, M.L., McGimsey, R.G., and Browne, B.L., 2007, Preliminary volcano-hazard assessment for the Tanaga Volcanic Cluster, Tanaga Island, Alaska: U.S. Geological Survey Scientific Investigations Report 2007-5094, 36 p., available online at: http://pubs.usgs.gov/sir/2007/5094/ .

Geothermal disruption of summit glaciers at Mount Spurr Volcano, 2004-6: an unusual manifestation of volcanic unrest, 2006

Coombs, M.L., Neal, C.A., Wessels, R.L., and McGimsey, R.G., 2006, Geothermal disruption of summit glaciers at Mount Spurr Volcano, 2004-6: an unusual manifestation of volcanic unrest: U.S. Geological Survey Professional Paper 1732-B, 33 p., available at http://pubs.usgs.gov/pp/pp1732/pp1732b/index.html .

The reawakening of Alaska's Augustine Volcano, 2006

Power, J.A., Nye, C.J., Coombs, M.L., Wessels, R.L., Cervelli, P.F., Dehn, J., Wallace, K.L., Freymueller, J.T., and Doukas, M.P., 2006, The reawakening of Alaska's Augustine Volcano: Eos, v. 87, n. 37, p. 373, 377.

Headless debris flows from Mount Spurr volcano, Alaska, 2004

McGimsey, R., Neal, C., Waythomas, C., Wessels, R., Coombs, M., Wallace, K., 2004, Headless debris flows from Mount Spurr Volcano, Alaska [abs.]: Transactions, American Geophysical Union, v. 85, n. 47, Abstract V43B-1430.

Preliminary geology of Gareloi Volcano, western Aleutian Islands (Alaska), 2004

Browne, B. L., Coombs, M. L., and Larsen, J. F., 2004, Preliminary geology of Gareloi Volcano, western Aleutian Islands (Alaska) [abs.]: Eos, AGU Fall Meeting Supplement, v. 85, n. 47, p. V43E-1454.

Preliminary geology of the Tanaga Island volcanic cluster, western Aleutians (Alaska), 2004

Coombs, M. L., Browne, B. L., and Larsen, J. F., 2004, Preliminary geology of the Tanaga Island volcanic cluster, western Aleutians (Alaska) [abs.]: Eos, AGU Fall Meeting Supplement, v. 85, n. 47, p. V43E-1457.

The 1929 eruption of Mount Gareloi, Alaska: A compositionally zoned, explosive fissure eruption of a predominantly mafic stratocone, 2004

Coombs M., and Browne, B., 2004, The 1929 eruption of Mount Gareloi, Alaska: A compositionally zoned, explosive fissure eruption of a predominantly mafic stratocone [abs.]: in Abstracts, IAVCEI General Assembly, Pucon, Chile, 2004, Abstract 3a-24.

Experimental and textural constraints on mafic enclave formation in volcanic rocks, 2003

Coombs, M. L., Eichelberger, J. C., and Rutherford, M. J., 2003, Experimental and textural constraints on mafic enclave formation in volcanic rocks: Journal of Volcanology and Geothermal Research, v. 119, n. 1-4, p. 125-144.

Experimental and petrologic constraints on magma movement, storage, and interactions at two volcanoes in Katmai National Park, Alaska, 2001

Coombs, M. L., 2001, Experimental and petrologic constraints on magma movement, storage, and interactions at two volcanoes in Katmai National Park, Alaska: University of Alaska Fairbanks unpublished Ph.D. dissertation, Fairbanks, Alaska, 214 p.

Shallow-storage conditions for the rhyolite of the 1912 eruption at Novarupta, Alaska, 2001

Coombs, M. L., and Gardner, J. E., 2001, Shallow-storage conditions for the rhyolite of the 1912 eruption at Novarupta, Alaska: Geology, v. 29, n. 9, p. 775-778.

Magma storage and mixing conditions for the 1953-1974 eruptions of Southwest Trident volcano, Katmai National Park, Alaska, 2000

Coombs, M. L., Eichelberger, J. C., and Rutherford, M. J., 2000, Magma storage and mixing conditions for the 1953-1974 eruptions of Southwest Trident volcano, Katmai National Park, Alaska: Contributions to Mineralogy and Petrology, v. 140, n. 1, p. 99-118, 1 sheet, scale unknown.

Magma storage and mixing conditions for the 1953-74 eruption of southwest Trident Volcano, Katmai National Park, Alaska, 2000

Coombs, M. L., Eichelberger, J. C., and Rutherford, M. J., 2000, Magma storage and mixing conditions for the 1953-74 eruption of southwest Trident Volcano, Katmai National Park, Alaska [abs.]: in Arctic Forum 2000, Abstracts from the Arctic Forum, Washington, DC, May 16-20, 2000, Fairbanks, AK, Arctic Research Consortium of the U.S. (ARCUS), p. 20.

Experimental constraints on mafic enclave formation in volcanic rocks, 1999

Coombs, M. L., Eichelberger, J. C., and Rutherford, M. J., 1999, Experimental constraints on mafic enclave formation in volcanic rocks [abs.]: Eos, v. 80, n. 46, p. 1165.

Magma storage conditions for the rhyolite of the 1912 eruption of Novarupta, Katmai National Park, Alaska, 1999

Gardner, J.E., and Coombs, M.L., 1999, Magma storage conditions for the rhyolite of the 1912 eruption of Novarupta, Katmai National Park, Alaska [abs.]: Transactions, American Geophysical Union, v. 80, n. 46, p. F1105.

Mount Dutton volcano, Alaska: Aleutian arc analog to Unzen volcano, Japan, 1999

Miller, T. P., Chertkoff, D. G., Eichelberger, J. C., and Coombs, M. L., 1999, Mount Dutton volcano, Alaska: Aleutian arc analog to Unzen volcano, Japan: in Nakada, S., Eichelberger, J. C., and Shimizu, H., (eds.), Unzen eruption: Magma ascent and dome growth, Journal of Volcanology and Geothermal Research, v. 89, n. 1, p. 275-301.

Preliminary investigation of the eruptive cycles of Okmok Volcano, Alaska, 1999

Burgisser, Alain, Larsen, J. F., Hazlett, R. W., Coombs, Michelle, Campbell, Matthew, and Eichelberger, John, 1999, Preliminary investigation of the eruptive cycles of Okmok Volcano, Alaska [abs.]: Eos, v. 80, n. 46, p. 1188.

The stratigraphy and petrology of the 3400 BP caldera-forming eruption of Aniakchak Volcano, Alaska, 1999

Dreher, S., Coombs, M., Larsen, J., and Eichelberger, J., 1999, The stratigraphy and petrology of the 3400 BP caldera-forming eruption of Aniakchak Volcano, Alaska [abs.]: Transactions, American Geophysical Union, v. 80, n. 17, p. S353.

Mafic enclave formation and effusive eruption at two Aleutian arc volcanoes, 1997

Coombs, M. L., Chertkoff, D. G., and Eichelberger, J. C., 1997, Mafic enclave formation and effusive eruption at two Aleutian arc volcanoes [abs.]: Eos, v. 78, n. 46, p. 828.

Seismicity in the vicinity of the Katmai Group of volcanoes, Katmai National Park, Alaska: July 1995-March 1997, 1997

Jolly, A. D., McNutt, S. R., Coombs, M. L., Stihler, S. D., and Paskievitch, J. F., 1997, Seismicity in the vicinity of the Katmai Group of volcanoes, Katmai National Park, Alaska: July 1995-March 1997 [abs.]: Eos, v. 78, n. 46, p. 442.

The mysterious and alluring cognate xenoliths of the New Trident andesite flows, Katmai National Park, Alaska, 1996

Coombs, M. L., 1996, The mysterious and alluring cognate xenoliths of the New Trident andesite flows, Katmai National Park, Alaska [abs.]: Eos, v. 77, n. 46, p. 770.