Janet R. Schaefer

Janet R. Schaefer

Chief, Volcanology Section - Geologic mapping, volcano hazard assessment, GIS, crater lakes, tephra studies and eruption response

  • Position:

    Geologist, Volcanology
  • Address:

    3354 College Road Fairbanks, AK 99709-3707
  • Phone:

    (907)451-5005
  • Fax:

    (907)451-5050
  • Email:

    janet.schaefer@alaska.gov

Education and/or Training

M.S. 2002, University of Alaska Fairbanks, Geology
B.S. 1994, San Francisco State University, Geology

Projects and/or Research Interests

Geologic mapping and tephrochronology at Chiginagak volcano
Holocene eruptive history of Makushin volcano
Geologic mapping and recent eruptions at Okmok volcano
Alaska Tephra Database Project

Other Professional Activities

PROFESSIONAL SOCIETY MEMBERSHIPS
Geological Society of America
American Geophysical Union
International Association of Volcanology and Chemistry of the Earth's Interior

Selected Publications

  • Unema, 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: Geological Society of America Bulletin, v. 128, no. 1-2, 15 p. http://dx.doi.org/10.1130/B31360.1
  • 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. http://doi.org/10.14509/29405
  • Stelling, 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. http://doi.org/10.14509/29146
  • 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. http://dx.doi.org/10.1016/j.jvolgeores.2013.07.003
  • 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. http://dx.doi.org/10.1016/j.jvolgeores.2012.04.025
  • 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. http://doi.org/10.14509/25602
  • 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. http://dx.doi.org/10.1016/j.jvolgeores.2012.09.015
  • 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 & Geophysical Surveys Miscellaneous Publication 143, 1 DVD. http://doi.org/10.14509/23463
  • Schaefer, J.R., Larsen, J.F., and Unema, J.A., 2012, Digital elevation model (DEM) and shaded relief image of Okmok Caldera, 2010: Alaska Division of Geological & Geophysical Surveys Raw Data File 2011-6. http://doi.org/10.14509/23223
  • Schaefer, J.R., ed., 2011, The 2009 eruption of Redoubt Volcano, Alaska, with contributions by Bull, K.F., Cameron, C.E., Coombs, M.L., Diefenbach, A.K., Lopez, Taryn, McNutt, S.R., Neal, C.A., Payne, A.L., Power, J.A., Schneider, D.J., Scott, W.E., Snedigar, S.F., Thompson, Glenn, Wallace, K.L., Waythomas, C.F., Webley, P.W., and Werner, C.A.: Alaska Division of Geological & Geophysical Surveys Report of Investigation 2011-5, 45 p. http://doi.org/10.14509/23123
  • Jensen, B.J.L., Preece, S.J., Lamothe, Michel, Pearce, N.J.G., Froese, D.G., Westgate, J.A., Schaefer, Janet, and Begét, 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.
  • Larsen, 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: American Geophysical Union, Eos, Transactions v. 90, n. 20, p. 173-174.
  • 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.
  • Schaefer, J.R., Scott, W.E., Evans, W.C., Jorgenson, J., McGimsey, R.G., and Wang, B., 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.
  • 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. http://doi.org/10.14509/16301
  • DGGS Staff, Nye, C.J., and Schaefer, J.R., 2008, Alaska GeoSurvey News - The Alaska Volcano Observatory - 20 years of volcano research, monitoring, and eruption response: Alaska Division of Geological & Geophysical Surveys Newsletter 2008-1, 14 p. http://doi.org/10.14509/16061
  • Larsen, J.F., Neal, Christina, Schaefer, Janet, Begét, 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: American Geophysical Union, Geophysical Monograph 172, 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.
  • Beget, 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. http://doi.org/10.14509/7042
  • Schaefer, J.R., 2005, 30-meter shaded relief image of Okmok Volcano, Umnak Island, Alaska: Alaska Division of Geological & Geophysical Surveys Raw Data File 2005-1. http://doi.org/10.14509/7041
  • Schaefer, J.R., and Nye, C.J., 2002, Historically active volcanoes of the Aleutian Arc: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 123, 1 sheet, scale 1:3,000,000. http://doi.org/10.14509/2773
  • Nye, 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, no. 8, p. 507-519.
  • Schaefer, J.R.G., 2002, Stratigraphy, major oxide geochemistry, and 40Ar/39Ar geochronology of a tephra section near Tok, Alaska: University of Alaska Fairbanks, M.S. thesis, 62 p., illust., maps.
  • Miller, L.G., Connell, T.L., Guidetti, J.R., and Oremland, R.S., 1997, Bacterial oxidation of methyl bromide in fumigated agricultural soils: Applied and Environmental Microbiology, v. 61, no. 7, p. 4346-4354.

Selected Presentations

  • 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. http://dx.doi.org/10.1016/j.jvolgeores.2012.04.025
  • Jensen, B.J.L., Preece, S.J., Lamothe, Michel, Pearce, N.J.G., Froese, D.G., Westgate, J.A., Schaefer, Janet, and Begét, 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.
  • Larsen, 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: American Geophysical Union, Eos, Transactions v. 90, n. 20, p. 173-174.
  • 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.
  • Larsen, J.F., Neal, Christina, Schaefer, Janet, Begét, 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: American Geophysical Union, Geophysical Monograph 172, p. 343-364.
  • Schaefer, J.R.G., 2002, Stratigraphy, major oxide geochemistry, and 40Ar/39Ar geochronology of a tephra section near Tok, Alaska: University of Alaska Fairbanks, M.S. thesis, 62 p., illust., maps.
  • Miller, L.G., Connell, T.L., Guidetti, J.R., and Oremland, R.S., 1997, Bacterial oxidation of methyl bromide in fumigated agricultural soils: Applied and Environmental Microbiology, v. 61, no. 7, p. 4346-4354.