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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):Geology
Tephra
Computer Systems/Database/GIS
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GIS, geologic mapping, volcano hazard assessments.
[Show Publications]

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, available at http://www.dggs.alaska.gov/pubs/id/20181 .
Download PDF files on DGGS's web site


The 2008 eruption of Okmok Volcano, Alaska: Petrological and geochemical constraints on the subsurface magma plumbing system, 2013
Larsen, 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


Summit crater lake observations, and the location, chemistry, and pH of water samples near Mount Chiginagak volcano, Alaska: 2004-2012, 2013
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


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


Injection, transport, and deposition of tephra during event 5 at Redoubt Volcano, 23 March, 2009, 2013
Mastin, 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


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, doi: 10.1016/j.jvolgeores.2012.09.015
http://dx.doi.org/10.1016/j.jvolgeores.2012.09.015


Ash fall contour map of the 2009 eruption of Redoubt Volcano, Alaska: Digital shapefiles of contours and sample locations, 2012
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 free download of publication on DGGS website


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.
Download link to PDF on ADGGS website


Digital elevation model (DEM) and shaded relief image of Okmok Caldera, 2010, 2011
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


The variegated (VT) tephra: A new regional marker for middle to late marine isotope stage 5 across Yukon and Alaska, 2011
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


The July-August 2008 hydrovolcanic eruption of Okmok Volcano, Umnak Island, Alaska, 2009
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.


Eruption of Alaska volcano breaks historic pattern, 2009
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.


The Alaska Volcano Observatory - 20 years of volcano research, monitoring, and eruption response, 2008
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 PDF full-text PDF on AVO's server : 5.68 MB
Download ADGGS website with link to PDF


Preliminary bathymetric map of Mother Goose Lake, Alaska Peninsula, 2008
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


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, 2008
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


A phytotoxic dense gas flow produced during the crater lake breakout at Chiginagak Volcano, Alaska, 2008
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.


Late Pleistocene and Holocene caldera-forming eruptions of Okmok Caldera, Aleutian Islands, Alaska, 2007
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.


Crisis GIS: Preparing for and responding to volcanic eruptions in the United States, 2007
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.


The 2005 crater lake formation, lahar, acidic flood, and caustic aerosol and gas release from Chiginagak Volcano, Alaska, 2006
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.


30-meter shaded relief image of Okmok Volcano, Umnak Island, Alaska, 2005
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


Preliminary volcano-hazard assessment for Okmok Volcano, Umnak Island, Alaska, 2005
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


The 2005 crater lake formation, lahar, acidic flood, and gas emission from Chiginagak volcano, Alaska, 2005
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.


Historically active volcanoes of the Aleutian Arc, 2002
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
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The 1999 eruption of Shishaldin Volcano, Alaska: monitoring a distant eruption, 2002
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


Preliminary volcano-hazard assessment for Shishaldin Volcano, Alaska, 2002
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 Investigations RI 2002-4, 28 p., 1 sheet, scale 1:500,000.
Download PDF full-text PDF : 2.25 MB


Stratigraphy, major oxide geochemistry, and 40Ar/39Ar geochronology of a tephra section near Tok, Alaska, 2002
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


(super 40) Ar/ (super 39) Ar dating of Quaternary low-potassium hornblende from a fine-grained Alaskan tephra by total laser-fusion, 2000
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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