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 .
link to ADGGS website with GIS files for download 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].
chapter PDF and spreadsheets on USGS website The Middle Scoria sequence: A Holocene violent strombolian, subplinian, and phreatomagmatic eruption of Okmok volcano, Alaska, 2010
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.
The role of water in generating the calc-alkaline trend: new volatile data for Aleutian magmas and a new tholeiitic index, 2010
Zimmer, 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 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
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: Eos, Transactions, American Geophysical Union, v. 90, n. 20, p. 173-174.
Deciphering the role of H2O and fO2 during calc-alkaline differentiation, 2009
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.
Rapid water exsolution, degassing, and bubble collapse observed experimentally in K-phonolite melts, 2008
Mongrain, 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.
Comparison of eruptive and intrusive samples from Unzen Volcano, Japan: Effects of contrasting pressure-temperature-time paths, 2008
Almberg, 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 Magmatic differentiation at an island-arc caldera: Okmok Volcano, Aleutian Islands, Alaska, 2008
Finney, 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 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.
Water under-saturated phase equilibria of basaltic andesites from Westdahl Volcano, Alaska, 2008
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.
Late Pleistocene and Holocene caldera-forming eruptions of Okmok Caldera, Aleutian Islands, Alaska, 2007
Larsen, 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.
Rhyodacite magma storage conditions prior to the 3430 yBP caldera-forming eruption of Aniakchak volcano, Alaska, 2006
Larsen, 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 Variations of glass composition at the start of the 2006 eruption, Augustine volcano, Alaska, 2006
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.
Degassing and microlite crystallization of basaltic andesite magma erupting at Arenal Volcano, Costa Rica, 2006
Szramek, 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 Preliminary volcano-hazard assessment for Okmok Volcano, Umnak Island, Alaska, 2005
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.
full text of report : 3.4 MB
map sheet : 53.2 MB
link to all files for this report on DGGS website The petrology and geochemistry of the Aniakchak caldera-forming ignimbrite, Aleutian Arc, Alaska, 2005
Dreher, 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 Experimental study of bubble coalescence in rhyolitic and phonolitic melts, 2004
Larsen, 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.
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.
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.
Analysis of composition and chronology of dome emplacement at Black Peak, Alaska utilizing ASTER remote sensing data and field-based studies, 2004
Adleman, 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.
full-text PDF : 60 KB
Analysis of composition and chronology of dome emplacement at Black Peak, Alaska utilizing ASTER remote sensing data and field-based studies, 2004
Adleman, 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.
full-text PDF : 16 KB
Constraints on the speciation of hydrogen in the Earth’s transition zone, 2003
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.
Amphibole reaction rims in response to decompression compared to heating: An experimental approach, 2003
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.
Analysis of composition and chronology of dome emplacement at Black Peak, Alaska utilizing ASTER remote sensing data and field-based studies, 2003
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.
website with full text Preliminary investigations of the ~4600 BP caldera-forming eruption and subsequent post-caldera activity, 2003
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.
website with full text Deciphering silicic dome emplacement processes in the northern Pacific: Quantitative analyses of high resolution satellite and field-based data, 2003
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.
website with full text Intra-caldera events: a look at the hydrovolcanic deposit stratigraphically located between two caldera-forming eruptions of Okmok Volcano, Umnak Island, Alaska, 2002
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.
The 2050 BP Okmok Caldera forming event: evidence for magma mixing as an eruption trigger, 2000
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.
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.
Larsen, 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 .
Larsen, J. F., 2005, Experimental study of plagioclase rim growth around anorthite seed crystals in rhyodacitic melt: American Mineralogist, v. 90, p. 417-427.
Larsen, 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.
@alaska_avo
Receive volcano updates by email: USGS VNS