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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.

Michelle Coombs
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Institute: USGS
Website: http://profile.usgs.gov/mcoomb
s
Address: Anchorage, AK 99508
Discipline(s):Geochemistry
Geochronology
Geology
Petrology
Stratigraphy
Tephra
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Michelle has been a Research Geologist for USGS-AVO in Anchorage since 2004. Her work includes research on a wide variety of topics in geology, petrology, and geochemistry, as well as geologic mapping and hazards assessment. Recent and current research interests include (1) timing and generation of explosive silicic eruptions at Alaskan volcanoes, especially Augustine and Hayes; (2) refined edifice mapping and eruptive history of Akutan, Spurr, and Redoubt volcanoes; and (3) combining petrologic study with detailed eruption chronologies to elucidate processes of magma generation and eruption triggering at dome-forming volcanoes such as Redoubt and Augustine.
Since March 2016, Michelle has been AVO's Scientist-in-Charge.
Prior to 2004, she worked for the USGS in Menlo Park, CA, where her research focused on the geochemistry, petrology, and submarine geology of Hawaiian volcanoes.


Benage, M.C., Wright, H.M.N., and Coombs, M.L., 2021, Eruption of compositionally heterogeneous andesites from a complex storage region during the 2006 eruption of Augustine Volcano: Bulletin of Volcanology, v. 83, n. 17, 23 p., doi:10.1007/s00445-020-01431-2.
http://dx.doi.org/10.1007/s00445-020-01431-2


Coombs, M.L., and Jicha, B.R., 2020, The eruptive history, magmatic evolution, and influence of glacial ice at long-lived Akutan volcano, eastern Aleutian Islands, Alaska: GSA Bulletin, 29 p., https://doi.org/10.1130/B35667.1.
http://dx.doi.org/10.1130/B35667.1
Download abstract at GSA Bulletin


Waters, L.E., Cottrell, Elizabeth, Coombs, M.L., and Kelley, K.A., 2020, Generation of calc-alkaline magmas during crystallization at high oxygen fugacity: an experimental and petrologic study of tephras from Buldir Volcano, western Aleutian arc, Alaska, USA: Journal of Petrology, p. 1-36, doi:10.1093/petrology/egaa104.
http://dx.doi.org/10.1093/petrology/egaa104


De Angelis, S.H., Larsen, J.F., Coombs, M.L., Utley, J.E.P., and Dunn, Andrew, 2020, Phase equilibrium of a high SiO2 andesite at fO2=RRO - Implications for Augustine Volcano and other high fO2 arc andesites: Contributions to Mineralogy and Petrology, v. 175, no. 24, 20 p., https://doi.org/10.1007/s00410-020-1663-6.
http://dx.doi.org/10.1007/s00410-020-1663-6


De Angelis, S.H., Larsen, J.F., Coombs, M.L., Utley, J.E.P., and Dunn, Andrew, 2020, Phase equlibrium of a high-SiO2 andesite at fO2=RRO: implications for Augustine Volcano and other high-fO2 arc andesites: Contributions to Mineralogy and Petrology, v. 175, n. 24, 21 p., doi: https://doi.org/10.1007/s00410-020-1663-6.
http://dx.doi.org/10.1007/s00410-020-1663-6


Loewen, M.L., Izbekov, Pavel, Moshrefzadeh, Jamshid, Coombs, Michelle, Larsen, Jessica, Graham, Nathan, Waythomas, Christopher, and Wallace, Kristi, 2019, Petrology of the 2016-2017 eruption of Bogoslof Island, Alaska: Bulletin of Volcanology v. 81, n. 72, 20 p., doi:10.1007/s00445-019-1333-6.
http://dx.doi.org/10.1007/s00445-019-1333-6


Coombs, Michelle, Wallace, Kristi, Cameron, Cheryl, Lyons, John, Wech, Aaron, Angeli, Kim, and Cervelli, Peter, 2019, Overview, chronology, and impacts of the 2016-2017 eruption of Bogoslof volcano, Alaska: Bulletin of Volcanology, v, 81, n. 62, doi:10.1007/s00445-019-1322-9.
http://dx.doi.org/10.1007/s00445-019-1322-9


Cameron, C.E., Prejean, S.G., Coombs, M.L., Wallace, K.L., Power, J.A., and Roman, D.C., 2018, Alaska Volcano Observatory Alert and Forecasting Timeliness: 1989-2017: Frontiers in Earth Science, v. 6, https://doi.org/10.3389/feart.2018.00086.
http://dx.doi.org/10.3389/feart.2018.00086
Download open-access full text on publisher website


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


Coombs, M.L., Larsen, J.F., and Neal, C.A., 2018, Postglacial eruptive history and geochemistry of Semisopochnoi volcano, western Aleutian Islands, Alaska: U.S. Geological Survey Scientific Investigations Report 2017-5150, 32 p., https://doi.org/10.3133/sir20175150.
http://dx.doi.org/https://doi.org/10.3133/sir20175150
Download full text PDF on USGS website


citation imageDe Angelis, S.H., Larsen, J., Coombs, M., Dunn, A., and Hayden, L., 2015, Amphibole reaction rims as a record of pre-eruptive magmatic heating: an experimental approach: Earth and Planetary Science Letters, v. 426, p. 235-245, doi:10.1016/j.epsl.2015.06.051
http://dx.doi.org/10.1016/j.epsl.2015.06.051


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


citation imageWallace, K.L., Coombs, M.L., Hayden, L.A., and Waythomas, C.F., 2014, Significance of a near-source tephra-stratigraphic sequence to the eruptive history of Hayes Volcano, south-central Alaska: U.S. Geological Survey Scientific Investigations Report 2014-5133, 32 p., available online at: http://pubs.usgs.gov/sir/2014/5133/
Download pub page on USGS website
Download PDF full-text PDF : 864 KB
Download excel files : 1 MB


citation imageCoombs, M.L., and Vazquez, J.A., 2014, Cogenetic late Pleistocene rhyolite and cumulate diorites from Augustine Volcano revealed by SIMS 238U-230Th dating of zircon, and implications for silicic magma generation by extraction from mush: Geochemistry, Geophysics, Geosystems, v. 15, 20 p., doi:10.1002/2014GC005589
http://dx.doi.org/10.1002/2014GC005589 2014GC005589


citation imageCoombs, 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


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 imageWessels, R.L., Vaughan, R.G., Patrick, M.R., and Coombs, M.L., 2013, High-resolution satellite and airborne thermal infrared imaging of precursory unrest and 2009 eruption at Redoubt Volcano, Alaska: Journal of Volcanology and Geothermal Research, v. 259, p. 248-269, doi:10.1016/j.jvolgeores.2012.04.014
http://dx.doi.org/10.1016/j.jvolgeores.2012.04.014
Download PDF full-text pdf : 6.55 MB


citation imageBleick, H.A., Coombs, M.L., Cervelli, P.F., Bull, K.F., and Wessels, R.L., 2013, Volcano-ice interactions precursory to the 2009 eruption of Redoubt Volcano, Alaska: Journal of Volcanology and Geothermal Research, v. 259, p. 373-388, doi:10.1016/j.jvolgeores.2012.10.008
http://dx.doi.org/10.1016/j.jvolgeores.2012.10.008
Download PDF full-text pdf : 4.6 MB


citation imageDe 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., 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


citation imageJicha, B.R., Coombs, M.L., Calvert, A.T., and Singer, B.S., 2012, Geology and 40Ar/39Ar geochronology of the medium- to high-K Tanaga volcanic cluster, western Aleutians: Geological Society of America Bulletin, v. 124, n. 5/6, p. 842-856, doi:10.1130/B30472.1 .
http://dx.doi.org/10.1130/B30472.1


Coombs, M.L., McGimsey, R.G., and Browne, B.L., 2012, Geologic map of Mount Gareloi, Gareloi Island, Alaska: U.S. Geological Survey Scientific Investigations Map 3145, 18 p., 1 sheet, scale 1:24,000, available at http://pubs.usgs.gov/sim/3145/ .
Download PDFs on a USGS website


Coombs, M.L., and Bacon, C.R., 2012, Using rocks to reveal the inner workings of magma chambers below volcanoes in Alaska's National Parks: in Alaska: in Winfree, Robert (project lead), Katmai Science Studies: Alaska Park Science Journal, v. 11, n. 1, p. 26-33, available online at http://www.nps.gov/akso/nature/science/ak_park_science/volume_11_issue_1.cfm .
Download link to PDF on NPS website


Winfree, Robert, with contributions from Bacon, C.R., Bennett, A.J., Bennington, Ninfa, Berg, E.E., Brooks, Margi, Coletti, H.A., Coombs, M.L., Fierstein, Judy, Freeburg, Gary, Frost, G.V., Haney, Matthew, Jorgenson, M.T., Miller, A.E., Moran, Seth, Murphy, Rachel, Partnow, Patricia, Paskievitch, John, Stevens, D.P., Powell, Lee, Power, John, Prejean, S.G., Schaaf, Jeanne, Sherriff, R.L., Thurber, Clifford, and Welchman, R.A., 2012, Katmai science studies: Alaska Park Science Journal, v. 11, n. 1, 96 p., available online at http://www.nps.gov/akso/nature/science/ak_park_science/volume_11_issue_1.cfm .
Download link to NPS website with full PDFs


Coombs, Michelle, 2011, Volcano from space, in Cook Inlet volcanoes: Frontier Scientists, WonderVisions, video, available at http://frontierscientists.com/category/cook_inlet_volcanoes/
Download publishers website


Power, J.A., Coombs, M.L., and Freymueller, J.T., eds., 2010, The 2006 eruption of Augustine Volcano, Alaska: U.S. Geological Survey Professional Paper 1769, 667 p., 1 plate, scale 1:20,000, and data files. Available online at http://pubs.usgs.gov/pp/1769/ .
Download link to publication on USGS website


Coombs, M.L., Bull, K.F., Vallance, J.W., Schneider, D.J., Thoms, E.E., Wessels, R.L., and McGimsey, R.G., 2010, Timing, distribution, and volume of proximal products of the 2006 Eruption of Augustine Volcano, chapter 8 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. 145-185, 1 plate, scale 1:20,000, and GIS data [http://pubs.usgs.gov/pp/1769/chapters/p1769_chapter08].
Download PDF and GIS files for chapter on USGS website


Vallance, J.W., Bull, K.F., and Coombs, M.L., 2010, Pyroclastic flows, lahars, and mixed avalanches generated during the 2006 eruption of Augustine Volcano, chapter 10 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. 219-267 [http://pubs.usgs.gov/pp/1769/chapters/p1769_chapter10.pdf].
Download PDF USGS website of chapter PDF


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


Webster, J.D., Mandeville, C.W., Goldoff, Beth, Coombs, M.L., and Tappen, Christine, 2010, Augustine Volcano; the influence of volatile components in magmas erupted A.D. 2006 to 2,100 years before present, chapter 16 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. 383-423 [http://pubs.usgs.gov/pp/1769/chapters/p1769_chapter16.pdf].
Download PDF chapter PDF on USGS website


Wessels, R.L., Coombs, M.L., Schneider, D.J., Dehn, Jonathan, and Ramsey, M.S., 2010, High-resolution satellite and airborne thermal infrared imaging of the 2006 eruption of Augustine Volcano, chapter 22 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. 527-552 [http://pubs.usgs.gov/pp/1769/chapters/p1769_chapter22.pdf].
Download PDF chapter PDF on USGS website


citation imageSisson, T.W., Kimura, J.-I., and Coombs, M.L., 2009, Basanite-nepheline suite from early Kilauea: carbonated melts of phlogopite-garnet peridotite at Hawaii's leading magmatic edge: Contributions to Mineralogy and Petrology, v. 158, p. 803-829, doi:10.1007/s00410-009-0411-8 .
http://dx.doi.org/doi:10.1007/s00410-009-0411-8


citation imageCoombs, M.L., McGimsey, R.G., and Browne, B.L., 2008, Preliminary volcano-hazard assessment for Gareloi Volcano, Gareloi Island, Alaska: U.S. Geological Survey Scientific Investigations Report 2008-5159, 29 p., 1 sheet, available at https://pubs.usgs.gov/sir/2008/5159/.
Download link to USGS website containing PDFs of report and map


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.


citation imageCoombs, M.L., White, S.M., and Scholl, D.W., 2007, Massive edifice failure at Aleutian arc volcanoes: Earth and Planetary Science Letters, v. 256, p. 403-418, doi: 10.1016/j.epsl.2007.01.030.
http://dx.doi.org/10.1016/j.epsl.2007.01.030


citation imageCoombs, M.L., McGimsey, R.G., and Browne, B.L., 2007, Preliminary volcano-hazard assessment for the Tanaga Volcanic Cluster, Tanaga Island, Alaska: U.S. Geological Survey Scientific Investigations Report 2007-5094, 36 p., available online at: http://pubs.usgs.gov/sir/2007/5094/ .
Download USGS website with links to PDF of report and map sheet


Neal, C.A., Coombs, Michelle, Wessels, Rick, and McGimsey, R.G., 2007, Volcanic disruption of summit ice at Mount Spurr Volcano, Alaska, 2004-2007 [abs.]: Geological Society of America - Abstracts with Programs, v. 39, n. 4, p. 20.


citation imagePower, J.A., Nye, C.J., Coombs, M.L., Wessels, R.L., Cervelli, P.F., Dehn, J., Wallace, K.L., Freymueller, J.T., and Doukas, M.P., 2006, The reawakening of Alaska's Augustine Volcano: Eos, v. 87, n. 37, p. 373, 377.


citation imageCoombs, M.L., Neal, C.A., Wessels, R.L., and McGimsey, R.G., 2006, Geothermal disruption of summit glaciers at Mount Spurr Volcano, 2004-6: an unusual manifestation of volcanic unrest: U.S. Geological Survey Professional Paper 1732-B, 33 p., available at http://pubs.usgs.gov/pp/pp1732/pp1732b/index.html .
Download website with link to full-text PDF


Coombs, M. L., and Gardner, J. E., 2004, Reaction rim growth on olivine in silicic melts: implications for magma mixing: American Mineralogist, v. 89, n. 5-6, p. 748-759.


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.


Coombs, M., Sisson, T., and Kimura, J.-I., 2004, Ultra-high chlorine in submarine Kilauea glasses: Evidence for assimilation of brine by magma: Earth and Planetary Science Letters, v. 217, p. 297-313.


Coombs, M., Clague, D., Moore, G., and Cousens, B., 2004, The growth and collapse of Waianae volcano, Hawaii, as revealed by exploration of its submarine flanks: Geochemistry, Geophysics, Geosystems, v. 5, doi: 10.1029/2004GC000717.
http://dx.doi.org/10.1029/2004GC000717


citation imageCoombs, M., Sisson, T., and Lipman, P., 2004, Major-element, sulfur, and chlorine compositions of glasses from the submarine flank of Kilauea Volcano, Hawaii, collected during 1998-2002 Japan Marine Science and Technology Center cruises: U.S. Geological Survey Open-File Report 2004-1378, 7 p.
Download website with links to PDF and Excel


Coombs, M., Sisson, T., and Lipman, P., 2004, Growth history of Kilauea inferred from dissolved volatiles in alkalic through tholeiitic glasses [abs.]: Western Pacific Geophysics Meeting Abstract V41A-42.


Coombs M., and Browne, B., 2004, The 1929 eruption of Mount Gareloi, Alaska: A compositionally zoned, explosive fissure eruption of a predominantly mafic stratocone [abs.]: in Abstracts, IAVCEI General Assembly, Pucon, Chile, 2004, Abstract 3a-24.


McGimsey, R., Neal, C., Waythomas, C., Wessels, R., Coombs, M., Wallace, K., 2004, Headless debris flows from Mount Spurr Volcano, Alaska [abs.]: Transactions, American Geophysical Union, v. 85, n. 47, Abstract V43B-1430.


Coombs, M. L., Eichelberger, J. C., and Rutherford, M. J., 2003, Experimental and textural constraints on mafic enclave formation in volcanic rocks: Journal of Volcanology and Geothermal Research, v. 119, n. 1-4, p. 125-144.


Coombs, M., Clague, D., and Moore, G., 2003, Development of the Waianae slump and Kaena Ridge, Hawaii [abs.]: Transactions, American Geophysical Union, v. 84, n. 46, Abstract V11G-03.


Coombs, M.L., Sisson, T.W., and Lipman, P.W., 2002, Shallow eruption depths for ancestral Kilauea: implications for its growth [abs.]: Transactions, American Geophysical Union, v. 83, n. 47, p. F1443.


Kimura, J.-I., Sisson, T.W., Coombs, M.L., Lipman, P.W., 2002, In-place alkalic lavas recovered from Hilina Bench off-shore Kilauea, Hawaii: significance in reconstructing ancient Kilauea history [abs.]: Transactions, American Geophysical Union, v. 83, n. 47, p. F1433.


Lipman, P.W., Sisson, T.W., Coombs, M.L.,, and Lanphere, M., 2002, Piggyback tectonics: Long-term growth of Kilauea on the south flank of Mauna Loa [abs.]: Transactions, American Geophysical Union, v. 83, n. 47, p. F1443.


citation imageCoombs, M. L., and Gardner, J. E., 2001, Shallow-storage conditions for the rhyolite of the 1912 eruption at Novarupta, Alaska: Geology, v. 29, n. 9, p. 775-778.
Download HTML abstract


citation imageCoombs, M. L., 2001, Experimental and petrologic constraints on magma movement, storage, and interactions at two volcanoes in Katmai National Park, Alaska: University of Alaska Fairbanks unpublished Ph.D. dissertation, Fairbanks, Alaska, 214 p.


citation imageCoombs, M. L., Eichelberger, J. C., and Rutherford, M. J., 2000, Magma storage and mixing conditions for the 1953-1974 eruptions of Southwest Trident volcano, Katmai National Park, Alaska: Contributions to Mineralogy and Petrology, v. 140, n. 1, p. 99-118, 1 sheet, scale unknown.


Coombs, M. L., Eichelberger, J. C., and Rutherford, M. J., 2000, Magma storage and mixing conditions for the 1953-74 eruption of southwest Trident Volcano, Katmai National Park, Alaska [abs.]: in Arctic Forum 2000, Abstracts from the Arctic Forum, Washington, DC, May 16-20, 2000, Fairbanks, AK, Arctic Research Consortium of the U.S. (ARCUS), p. 20.


citation imageMiller, T. P., Chertkoff, D. G., Eichelberger, J. C., and Coombs, M. L., 1999, Mount Dutton volcano, Alaska: Aleutian arc analog to Unzen volcano, Japan: in Nakada, S., Eichelberger, J. C., and Shimizu, H., (eds.), Unzen eruption: Magma ascent and dome growth, Journal of Volcanology and Geothermal Research, v. 89, n. 1, p. 275-301.


Coombs, M. L., Eichelberger, J. C., and Rutherford, M. J., 1999, Experimental constraints on mafic enclave formation in volcanic rocks [abs.]: Eos, v. 80, n. 46, p. 1165.


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.


Gardner, J.E., and Coombs, M.L., 1999, Magma storage conditions for the rhyolite of the 1912 eruption of Novarupta, Katmai National Park, Alaska [abs.]: Transactions, American Geophysical Union, v. 80, n. 46, p. F1105.


Coombs, M. L., Chertkoff, D. G., and Eichelberger, J. C., 1997, Mafic enclave formation and effusive eruption at two Aleutian arc volcanoes [abs.]: Eos, v. 78, n. 46, p. 828.


Jolly, A. D., McNutt, S. R., Coombs, M. L., Stihler, S. D., and Paskievitch, J. F., 1997, Seismicity in the vicinity of the Katmai Group of volcanoes, Katmai National Park, Alaska: July 1995-March 1997 [abs.]: Eos, v. 78, n. 46, p. 442.


Coombs, M. L., 1996, The mysterious and alluring cognate xenoliths of the New Trident andesite flows, Katmai National Park, Alaska [abs.]: Eos, v. 77, n. 46, p. 770.

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