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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.

ADGGS
907-451-5010
3354 College Road
Fairbanks, AK 99709
Cameron, CherylNye, ChristopherSchaefer, Janet
UAF/GI
USGS
Jessica Larsen
Department: Geophysical Institute
Institute: UAF/GI
Discipline(s):Geology
Petrology
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Jessica is a Research Associate Professor with the Geophysical Institute. Research involvement includes volatiles in magmas, vesiculation kinetics, and magma mixing and mingling. Research sites include Okmok, Augustine, Westdahl, and Vesuvius volcanoes in Alaska and Italy.

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

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
http://dx.doi.org/10.1016/j.jvolgeores.2012.01.002

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
http://dx.doi.org/10.1093/petrology/egt037

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

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].
Download chapter PDF and spreadsheets on USGS website

Wong, L.J., and Larsen, J.F., 2010, The Middle Scoria sequence: A Holocene violent strombolian, subplinian, and phreatomagmatic eruption of Okmok volcano, Alaska: Bulletin of Volcanology, v. 71, p. 17-31.

citation imageZimmer, M.M., Plank, Terry, Hauri, E.H., Yogodzinski, G.M., Stelling, Peter, Larsen, Jessica, Singer, Brad, Jicha, Brian, Mandeville, Charles, and Nye, C.J., 2010, The role of water in generating the calc-alkaline trend: new volatile data for Aleutian magmas and a new tholeiitic index: Journal of Petrology, v. 5, n. 12, p. 2411, 2444, doi:10.1093/petrology/egq062 .
http://dx.doi.org/10.1093/petrology/egq062

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.

Zimmer, M.M., Plank, Terry, Hauri, E.H., Larsen, J.F., and Nye, C.J., 2009, Deciphering the role of H2O and fO2 during calc-alkaline differentiation [abs.]: in Abstracts of the 19th annual V.M. Goldschmidt conference, Geochimica et Cosmochimica Acta, v. 73, n. 13S, p. A1535.

citation imageMongrain, J., Larsen, J.F., and King, P.L., 2008, Rapid water exsolution, degassing, and bubble collapse observed experimentally in K-phonolite melts: Journal of Volcanology and Geothermal Research, v. 173, n. 3-4, p. 178-184.

citation imageLarsen, J.F., 2008, Heterogeneous bubble nucleation and disequilibrium H2O exsolution in Vesuvius K-phonolite melts: Journal of Volcanology and Geothermal Research, v. 175, p. 278-288, doi:10.1016/j.jvolgeores.2008.03.015 .
http://dx.doi.org/10.1016/j.jvolgeores.2008.03.015

citation imageAlmberg, LD., Larsen, J.F., Eichelberger, J.C., Vogel, T.A., and Patino, LC., 2008, Comparison of eruptive and intrusive samples from Unzen Volcano, Japan: Effects of contrasting pressure-temperature-time paths: Journal of Volcanology and Geothermal Research, v. 175, p. 60-70, doi:10.1016/j.jvolgeores.2008.03.020 .
http://dx.doi.org/doi:10.1016/j.jvolgeores.2008.03.020

citation imageFinney, Benjamin, Turner, Simon, Hawkesworth, Chris, Larsen, Jessica, Nye, Chris, George, Rhiannon, Bindeman, Ilya, and Eichelberger, John, 2008, Magmatic differentiation at an island-arc caldera: Okmok Volcano, Aleutian Islands, Alaska: Journal of Petrology, doi:10.1093/petrology/egn008 .
http://dx.doi.org/10.1093/petrology/egn008

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.

Rader, E.L., and Larsen, J., 2008, Water under-saturated phase equilibria of basaltic andesites from Westdahl Volcano, Alaska [abs.]: Eos, Transactions, American Geophysical Union, v. 89, n. 53, 1 p.

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.

citation imageLarsen, J.F., 2006, Rhyodacite magma storage conditions prior to the 3430 yBP caldera-forming eruption of Aniakchak volcano, Alaska: Contributions to Mineralogy and Petrology, v. 152, n. 4, p. 523-540, doi: 10.1007/s00410-006-0121-4.
http://dx.doi.org/10.1007/s00410-006-0121-4

Izbekov, Pavel, Wallace, Kristi, Larsen, Jessica, Nye, Chris, and Eichelberger, John, 2006, Variations of glass composition at the start of the 2006 eruption, Augustine volcano, Alaska [abs.]: Geological Society of America - Abstracts with Programs, v. 38, n. 5, p. 76-77.

citation imageSzramek, Lindsay, Gardner, J.E., and Larsen, Jessica, 2006, Degassing and microlite crystallization of basaltic andesite magma erupting at Arenal Volcano, Costa Rica: Journal of Volcanology and Geothermal Research, v. 157, p. 182-201, doi:10.1016/j.jvolgeores.2006.03.039 .
http://dx.doi.org/10.1016/j.jvolgeores.2006.03.039

citation imageLarsen, J. F., 2005, Experimental study of plagioclase rim growth around anorthite seed crystals in rhyodacitic melt: American Mineralogist, v. 90, p. 417-427.

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

citation imageDreher, S.T., Eichelberger, J.C., and Larsen, J.F., 2005, The petrology and geochemistry of the Aniakchak caldera-forming ignimbrite, Aleutian Arc, Alaska: Journal of Petrology, v. 46, n. 9, p. 1747-1768, doi: 10.1093/petrology/egi032.
http://dx.doi.org/10.1093/petrology/egi032

citation imageLarsen, J. F., and Gardner, J. E., 2004, Experimental study of water degassing from phonolite melts: implications for volatile oversaturation during magmatic ascent: Journal of Volcanology and Geothermal Research, v. 134, n. 1-2, p. 109-124.

citation imageLarsen, J. F., Denis, M. H., and Gardner, J. E., 2004, Experimental study of bubble coalescence in rhyolitic and phonolitic melts: Geochimica et Cosmochimica Acta, v. 68, p. 333-344.

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.

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.

citation imageAdleman, J.N., Larsen, J.F., Ramsey, M.S., McGimsey, R.G., and Neal, C.A., 2004, Analysis of composition and chronology of dome emplacement at Black Peak, Alaska utilizing ASTER remote sensing data and field-based studies [abs.]: in Abstract Volume, IAVCEI General Assembly, November 2004, Pucon, Chile, s08c_pf_165.
Download PDF full-text PDF : 60 KB

citation imageAdleman, J.N., Larsen, J.F., Ramsey, M.S., McGimsey, R.G., and Neal, C.A., 2004, Analysis of composition and chronology of dome emplacement at Black Peak, Alaska utilizing ASTER remote sensing data and field-based studies [abs.]: in Abstract Volume, IV International Biennial Workshop on Subduction Processes emphasizing the Japan-Kurile-Aleutain Arcs, August 2004, unpaged.
Download PDF full-text PDF : 16 KB

Larsen, J. F., Knittle, E., and Williams, Q., 2003, Constraints on the speciation of hydrogen in the Earth’s transition zone: Physics of Earth and Planetary Interiors, v. 136, p. 93-105.

Browne, B. L, Gardner, J. E., and Larsen, J. F., 2003, Amphibole reaction rims in response to decompression compared to heating: An experimental approach: Eos, AGU Fall Meeting Supplement, v. 84, n. 46, p. V12A-0551.

Adleman, J.N., Larsen, J.F., Ramsey, M.S., McGimsey, R.G., and Neal, C.A., 2003, Analysis of composition and chronology of dome emplacement at Black Peak, Alaska utilizing ASTER remote sensing data and field-based studies [abs.]: in Fall meeting supplementary, Eos, v. 84, n. 46, Abstract V31G-07.
Download Plaintext website with full text

McGimsey, R.G., Neal, C.A., Adleman, J.N., Larsen, J.F., and Ramsey, M.S., 2003, Preliminary investigations of the ~4600 BP caldera-forming eruption and subsequent post-caldera activity [abs.]: in Fall meeting supplement, Eos, v. 84, n. 46, V42B-0342.
Download Plaintext website with full text

Ramsey, M.S., Dehn, J., Adleman, J.N., Larsen, J.F., McGimsey, R.G., Neal, C.A., and Wessels, R., 2003, Deciphering silicic dome emplacement processes in the northern Pacific: Quantitative analyses of high resolution satellite and field-based data [abs.]: in Fall meeting supplement, Eos, v. 84, n. 46, V51F-0346.
Download website with full text

Larsen, J. F., 2002, Pre-eruptive dynamics of the 3400 vBP Aniakchak caldera forming eruption: a phase equilibria study [abs.]: Eos, v. 83, n. 47, p. V12C-04.

Wong, L. J., and Larsen, J. F., 2002, Intra-caldera events: a look at the hydrovolcanic deposit stratigraphically located between two caldera-forming eruptions of Okmok Volcano, Umnak Island, Alaska [abs.]: Eos, v. 83, n. 47, p. V11A-1378.

Larsen, J. F., Nye, C. J., and Ray, L. A., 2000, The 2050 BP Okmok Caldera forming event: evidence for magma mixing as an eruption trigger [abs.]: Eos, v. 81, n. 48, p. 1376.

Larsen, J. F., and Gardner, J., 2000, Experimental constraints on bubble interactions in rhyolite melts: implications for vesicle size distributions: Earth and Planetary Science Letters, v. 180, p. 201-214.

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.

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.

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