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AVO STAFF DIRECTORY
AVO is a very extended family. Some people work full time for the observatory, others well under half time. Others perform essential work, but only draw operating expenses. Several agencies contribute personnel at several locations. A wide variety of disciplines are represented, including geophysics, geology, glaciology, hydrology, geochemistry, remote sensing, computing, electronics, and administration. The following people are the paid staff, and share among themselves about 22 Full Time Equivalent positions.

[List staff by discipline] [List staff alphabetically] [List staff by office location]
* When listing staff by discipline, some individuals may be listed more than once.

Janet Schaefer
Department: Alaska State Geological and Geophysical Surveys
Institute: ADGGS
Address: Fairbanks, AK 99709
Discipline(s):
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Peccia, A., Moussallam, Y., Plank, T., DallaSanta, K., Polvani, L., Burgisser, A., Larsen, J., and Schaefer, J., 2023, A new multi-method assessment of stratospheric sulfur load from the Okmok II caldera-forming eruption of 43 BCE: Geophysical Research Letters v. 50, no. 21, e2023GL103334. https://doi.org/10.1029/2023GL103334.
http://dx.doi.org/10.1029/2023GL103334


Larsen, J.F., Schaefer, J.R., and Cameron, C.E., 2022, Electron probe microanalytical data of minerals and glass from rock samples from Okmok volcano, Alaska: Alaska Division of Geological & Geophysical Surveys Raw Data File 2022-6, 13 p. https://doi.org/10.14509/30853.
http://dx.doi.org/10.14509/30853
Download publication on DGGS website


Schaefer, J.R.G., Perreault, J.M., Larsen, J.F., and Vallance, J.W., 2020, Makushin Volcano ash hazards: Alaska Division of Geological & Geophysical Surveys Information Circular 86, 2 p., http://doi.org/10.14509/30411.
http://dx.doi.org/10.14509/30411
Download reference on DGGS website


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
http://dx.doi.org/10.14509/30426
Download download publication from ADGGS website


Bergfeld, Deborah, Evans, W.C., Hunt, A.G., Lopez, Taryn, and Schaefer, J.R., 2020, A post-eruption study of gases and thermal waters at Okmok volcano, Alaska: Journal of Volcanology and Geothermal Research, v, 396, doi:10.1016/j.jvolgeores.2020.106853.
http://dx.doi.org/10.1016/j.jvolgeores.2020.106853
Download article on JVGR website


McConnell, J.R., Sigl, Michael, Plunkett, Gil, Burke, Andrea, Kim, W.M., Raible, C.C., Wilson, A.I., Manning, J.G., Ludlow, Francis, Chellman, N.J., Innes, H.M., Yang, Zhen, Larsen, J.F., Schaefer, J.R., Kipfstuhl, Sepp, Mojtabavi, Seyedhamidreza, Wilhelms, Frank, Opel, Thomas, Meyer, Hanno, and Steffensen, J.P., 2020, Extreme climate after massive eruption of Alaska's Okmok volcano in 43 BCE and effects on the late Roman Republic and Ptolemaic Kingdom: Proceedings of the National Academy of Science of the United States of America, 7 p., www.pnas.org/cgi/doi/10.1073/pnas.2002722117.
http://dx.doi.org/10.1073/pnas.2002722117
Download article on PNAS website


Larsen, J.F., Schaefer, Janet, Vallance, J.W., and Neill, O.K., 2020, Petrology and geochemistry of three Early Holocene eruptions from Makushin Volcano, Alaska: Bulletin of Volcanology, v. 82, n. 72, 17 p., doi:10.1007/s00445-020-01412-5.
http://dx.doi.org/10.1007/s00445-020-01412-5


Cameron, C.E., Mulliken, K.M., Crass, S.W., Schaefer, J.R., and Wallace, K.L., 2019, Alaska Volcano Observatory geochemical database, version 2: Alaska Division of Geological & Geophysical Surveys Digital Data Series 8 v. 2, 22 p., https://www.avo.alaska.edu/geochem/. Http://doi.org/10.14509/30058
http://dx.doi.org/10.14509/30058
Download application on AVO page
Download citation on DGGS page


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 .
http://dx.doi.org/10.3389/feart.2018.00122
Download open-access on publisher website


Worden, A.K., Schaefer, J.R., and Mulliken, K.M., 2018, Tephra occurrence in Alaska: a map-based compilation of stratigraphic tephra data: Alaska Division of Geological and Geophysical Surveys Miscellaneous Publication 165, 19 p., http://doi.org/10.14509/30059
http://dx.doi.org/10.14509/30059
Download publication for download on DGGS website


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
http://dx.doi.org/10.14509/30142
Download download from DGGS website


Mulliken, K.M., Schaefer, J.R., and Cameron, C.E., 2018, Geospatial distribution of tephra fall in Alaska: a geodatabase compilation of published tephra fall occurrences from the Pleistocene to the present: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 164, 46 p. http://doi.org/10.14509/29847
Download Link to DGGS publication page


Schaefer, J.R., Scott, W.E., and Layer, P.W., 2017, Geologic map of Mount Chiginagak volcano, Alaska: Alaska Division of Geological & Geophysical Surveys Report of Investigation 2017-10, 32 p., 1 sheet, scale 1:25,000. http://doi.org/10.14509/29769
http://dx.doi.org/10.14509/29769
Download Citation page and downloads on DGGS website


Cameron, C.E., Dixon, J.P., Neal, C.A., Waythomas, C.F., Schaefer, J.R., and McGimsey, R.G., 2017, 2014 Volcanic activity in Alaska - Summary of events and response of the Alaska Volcano Observatory: U.S. Geological Survey Scientific Investigations Report 2017-5077, 81 p., https://doi.org/10.3133/sir20175077.
Download PDF full-text PDF : 6.8 MB


citation imageUnema, J.A., Ort, M.H., Larsen, J.F., Neal, C.A., and Schaefer, J.R., 2016, Water-magma interaction and plume processes in the 2008 Okmok eruption, Alaska: GSA Bulletin, 15 p., doi:10.1130/B31360.1
http://dx.doi.org/10.1130/B31360.1


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
http://dx.doi.org/10.14509/20181
Download publication on ADGGS website


Larsen, J.F., Neal, C.A., Schaefer, J.R., Kaufman, A.M., and Lu, Zhong, 2015, The 2008 phreatomagmatic eruption of Okmok Volcano, Aleutian Islands, Alaska: Chronology, deposits, and landform changes: Alaska Division of Geological & Geophysical Surveys Report of Investigation 2015-2, 53 p. doi:10.14509/29405
http://dx.doi.org/10.14509/29405
Download link to PDF on DGGS website


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
http://dx.doi.org/10.5066/F74X55VB
Download data tables (.xlsx) : 101 KB
Download PDF text and figures to accompany data release, originally hosted on USGS water resources website : 1.9 MB


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 .
Download PDF files on DGGS's web site


citation imageStelling, P.L., Beget, J.E., Gardner, J.E., and Schaefer, J.R., 2014, Preliminary volcano-hazard assessment for Fisher volcano, Unimak Island, Alaska: Alaska Division of Geological & Geophysical Surveys Report of Investigation 2014-5, 32 p., 1 sheet, scale 1:500,000. doi:10.14509/29146 .
http://dx.doi.org/10.14509/29146
Download link to PDF and associated files on DGGS website
Download PDF full-text PDF : 25 MB
Download PDF map sheet : 79 MB


Schaefer, J.R., Scott, W.E., Evans, W.C., Wang, Bronwen, and McGimsey, R.G., 2013, Summit crater lake observations, and the location, chemistry, and pH of water samples near Mount Chiginagak volcano, Alaska: 2004-2012: Alaska Division of Geological & Geophysical Surveys Report of Investigation 2011-6 v. 2, 25 p., available online at www.dggs.gov/pubs/id/25602 .
Download link to publication on ADGGS website


citation imageWallace, 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
http://dx.doi.org/10.1016/j.jvolgeores.2012.09.015
Download PDF full-text pdf : 6.3 MB


citation imageMastin, L.G., Schwaiger, Hans, Schneider, D.J., Wallace, K.L., Schaefer, Janet, and Denlinger, R.P., 2013, Injection, transport, and deposition of tephra during event 5 at Redoubt Volcano, 23 March, 2009: Journal of Volcanology and Geothermal Research, v. 259, p. 201-213, doi:10.1016/j.jvolgeores.2012.04.025
http://dx.doi.org/10.1016/j.jvolgeores.2012.04.025
Download PDF full-text pdf : 5.6 MB


citation imageLarsen, J.F., Sliwinski, M.G., Nye, Christopher, Cameron, Cheryl, and Schaefer, J.R., 2013, The 2008 eruption of Okmok Volcano, Alaska: Petrological and geochemical constraints on the subsurface magma plumbing system: Journal of Volcanology and Geothermal Research, v. 264, p. 85-106, doi:10.1016/j.jvolgeores.2013.07.003 .
http://dx.doi.org/10.1016/j.jvolgeores.2013.07.003


Schaefer, J.R., and Wallace, K.L., 2012, Ash fall contour map of the 2009 eruption of Redoubt Volcano, Alaska: Digital shapefiles of contours and sample locations: Alaska Division of Geological and Geophysical Surveys Miscellaneous Publication 143, 1 DVD. Available free online at http://www.dggs.alaska.gov/pubs/id/23463 .
Download link to download of publication on DGGS website


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.
Download link to PDF on ADGGS website


Schaefer, J.R., Larsen, J.F., and Unema, J.A., 2011, Digital elevation model (DEM) and shaded relief image of Okmok Caldera, 2010: Alaska Division of Geological & Geophysical Surveys Raw Data File 2011-6, 1 DVD, available online at http://www.dggs.dnr.state.ak.us/pubs/id/23223 .
Download link to ADGGS website with GIS files for download


citation imageJensen, B.J.L., Preece, S.J., Lamothe, Michel, Pearce, N.J.G., Froese, D.G., Westgate, J.A., Schaefer, Janet, and Beget, Jim, 2011, The variegated (VT) tephra: A new regional marker for middle to late marine isotope stage 5 across Yukon and Alaska: Quaternary International, v. 246, p. 312-323, doi: 10.1016/j.quaint.2011.06.028.
http://dx.doi.org/10.1016/j.quaint.2011.06.028


Neal, C.A., Larsen, J.F., and Schaefer, Janet, 2009, The July-August 2008 hydrovolcanic eruption of Okmok Volcano, Umnak Island, Alaska: Alaska Geological Society Newsletter, v. 39, n. 5, p. 1-3.


citation imageLarsen, J., Neal, C., Webley, P., Freymueller, J., Haney, M., McNutt, S., Schneider, D., Prejean, S., Schaefer, J., and Wessels, R., 2009, Eruption of Alaska volcano breaks historic pattern: Eos, Transactions, American Geophysical Union, v. 90, n. 20, p. 173-174.


citation imageSchaefer, 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 .
Download ADGGS website with link to PDF
Download PDF full-text PDF on AVO's server : 5.68 MB


Schaefer, J.R., Wallace, K.L., and Kassel, C.M., 2008, Preliminary bathymetric map of Mother Goose Lake, Alaska Peninsula: Alaska Division of Geological & Geophysical Surveys Raw Data File 2008-3, 1 disc, available at http://www.dggs.dnr.state.ak.us/pubs/id/16301 .
Download DGGS site with links to data, GIS, and metadata files


citation imageSchaefer, J. R., W. E. Scott, W. C. Evans, J. Jorgenson, R. G. McGimsey, and B. Wang, 2008, The 2005 catastrophic acid crater lake drainage, lahar, and acidic aerosol formation at Mount Chiginagak volcano, Alaska, USA: Field observations and preliminary water and vegetation chemistry results: Geochemistry Geophysics Geosystems, v. 9, n. 7, 29 p., Q07018, doi:10.1029/2007GC001900.
http://dx.doi.org/10.1029/2007GC001900


Pfeffer, Melissa, and Schaefer, Janet, 2008, A phytotoxic dense gas flow produced during the crater lake breakout at Chiginagak Volcano, Alaska [abs.]: 33rd International Geological Congress, Oslo, Norway.


citation imageLarsen, J. F., Neal, Christina, Schaefer, Janet, Beget, Jim, and Nye, Chris, 2007, Late Pleistocene and Holocene caldera-forming eruptions of Okmok Caldera, Aleutian Islands, Alaska, in Eichelberger, John, Gordeev, Evgenii, Izbekov, Pavel, Kasahara, Minoru, and Lees, Jonathan, eds., Volcanism and Subduction: The Kamchatka Region: Geophysical Monograph 172, American Geophysical Union, p. 343-364.


Ramsey, D. W., Robinson, J. E., Schilling, S. P., Schaefer, J. R., and Trusdell, F. A., 2007, Crisis GIS: Preparing for and responding to volcanic eruptions in the United States, in Thomas, C., ed., Standards for Success: GIS for Federal Progress and Accountability: Redlands, California, ESRI Press, p. 3-8.


Schaefer, J.R., Scott, W.E., McGimsey, R.G., and Jorgenson, Janet, 2006, The 2005 crater lake formation, lahar, acidic flood, and caustic aerosol and gas release from Chiginagak Volcano, Alaska [abs.]: Geological Society of America - Abstracts with Programs, v. 38, n. 5, p. 29.


citation imageSchaefer, J. R., 2005, 30-meter shaded relief image of Okmok Volcano, Umnak Island, Alaska: Alaska Division of Geological & Geophysical Surveys Raw Data File RDF 2005-01, 1 CD-ROM.
Download MapInfo .TAB file : 1 KB
Download .TFW file : 1 KB
Download Tiff TIFF image file : 17.4 MB
Download image of shaded relief TIFF file : 26 KB
Download Plaintext metadata for RDF 2005-01 : 23 KB


citation imageBeget, J.E., Larsen, J.F., Neal, C.A., Nye, C.J., and Schaefer, J.R., 2005, Preliminary volcano-hazard assessment for Okmok Volcano, Umnak Island, Alaska: Alaska Division of Geological & Geophysical Surveys Report of Investigation 2004-3, 32 p., 1 sheet, scale 1:150,000.
Download PDF full text of report : 3.4 MB
Download PDF map sheet : 53.2 MB
Download link to all files for this report on DGGS website


Schaefer, J.R., Scott, W.E., McGimsey, R.G., Jorgenson, Janet, 2005, The 2005 crater lake formation, lahar, acidic flood, and gas emission from Chiginagak volcano, Alaska, [abs.]: EOS, Transactions of the American Geophysical Union Fall Meeting Supplement, Abstract V21E-0675.


citation imageSchaefer, 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
Download link to PDF files on DGGS website of MP133, which updates MP123
Download
Download


citation imageNye, C. J., Keith, T. E. C., Eichelberger, J. C., Miller, T. P., McNutt, S. R., Moran, S., Schneider, D. J., Dehn, J., and Schaefer, J. R., 2002, The 1999 eruption of Shishaldin Volcano, Alaska: monitoring a distant eruption: Bulletin of Volcanology, v. 64, n. 8, p. 507-519.
http://dx.doi.org/10.1007/s00445-002-0225-2


citation imageBeget, J. E., Nye, C. J., Schaefer, J. R., and Stelling, P. L., 2002, Preliminary volcano-hazard assessment for Shishaldin Volcano, Alaska: Alaska Division of Geological & Geophysical Surveys Report of Investigation 2002-4, 28 p., 1 sheet, scale 1:500,000.
Download PDF full-text PDF : 2.25 MB


citation imageSchaefer, J. R. G., 2002, Stratigraphy, major oxide geochemistry, and 40Ar/39Ar geochronology of a tephra section near Tok, Alaska: University of Alaska Fairbanks unpublished M.S. thesis, 62 p.
Download PDF full-text PDF : 2.06 MB


Schaefer, J. R. G., Layer, P. W., Beget, J. E., and Drake, Jeff, 2000, (super 40) Ar/ (super 39) Ar dating of Quaternary low-potassium hornblende from a fine-grained Alaskan tephra by total laser-fusion [abs.]: Eos, v. 81, n. 48, p. 1375-1376.

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