Alaska Volcano Observatory

Jim Beget

Department:	Geophysical Institute and Dept. of Geology and Geophysics
Institute:	UAF/GI
Address:	Fairbanks, AK 99775-5780
Discipline(s):	Geology Tephra

send email message

Jim has been involved with AVO since its founding in 1988, and also receives research support from the National Science Foundation, NASA, and the National Park system. He is a past president of the Commission on Tephrochronology and Volcanology of the International Quaternary Association (INQUA-COTAV), and is a current member of the Leader's Group of the Past Global Climate Change Program of the International Geosphere-Biosphere Project (IGBP-PAGES), researching Volcano-Climate Interactions and the U.S. National Quaternary Committee, sponsored by the National Research Council. His AVO research program emphasizes volcanic hazards, and includes tephra studes, reconstructions of volcano eruption histories, and volcanic tsunamis. His fieldwork has included projects at Augustine, Redoubt, Spurr, Iliamna, Douglass, Katmai, Shishaldin Makushin, Okmok, and other volcanoes in the eastern Aleutian arc, as well as volcanoes in Japan, Kamchatka, Iceland, Italy and other areas.

[Show Publications]

Volcanic processes and geology of Augustine Volcano, Alaska 4559

Waitt, R.B., and Beget, J.E., 2009, Volcanic processes and geology of Augustine Volcano, Alaska: U.S. Geological Survey Professional Paper 1762, 78 p., 2 plates, scale 1:25,000, available at http://pubs.usgs.gov/pp/1762/ .

link to USGS website with links to PDFs of text and sheets

Volcanic tsunamis and prehistoric cultural transitions in Cook Inlet, Alaska 4482

Beget, James, Gardner, Cynthia, and Davis, Kathleen, 2008, Volcanic tsunamis and prehistoric cultural transitions in Cook Inlet, Alaska: Journal of Volcanology and Geothermal Research v, 176, p. 377-386, doi:10.1016/j.jvolgeores.2008.01.034 .

Late Pleistocene and Holocene caldera-forming eruptions of Okmok Caldera, Aleutian Islands, Alaska 4464

Okmok volcano, in the central Aleutian arc, Alaska, produced two caldera-forming eruptions within the last ~12,000 years. This study describes the stratigraphy, composition, and petrology of those two eruptions. Both eruptions initially produced small volumes of felsic magmas, followed by voluminous andesite and basaltic andesite. The Okmok I eruption produced >30 km3 DRE of material on Umnak Island, and Okmok II ~15 km3.

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.

Confirmation and calibration of computer modeling of tsunamis produced by Augustine Volcano, Alaska 4148

Augustine Volcano is the most active volcano in the Cook Inlet region of Alaska. It erupted at least five times during the 20th century, and began erupting again in December 2005. The activity in early 2006 has included multiple episodes of explosive ash and pyroclastic flow eruptions, as well as lava dome eruptions at the summit of the volcano. The steep summit edifice of Augustine Volcano repeatedly collapsed in giant debris avalanches into the sea around Augustine Island during the last 2000 years, most recently in 1883 (Beget and Kienle, 1992; Siebert et al., 1995). Volcanic debris avalanches into the sea are an important cause of tsunamis (Beget, 2000).

Beget, J.E., and Kowalik, Zygmunt, 2006, Confirmation and calibration of computer modeling of tsunamis produced by Augustine Volcano, Alaska: Science of Tsunami Hazards, v. 24, n. 4, p. 257-267, available for download at http://www.sthjournal.org/244/beget.pdf.
full-text PDF : 832 KB

Proximal tsunami deposits produced during the 1883 eruption of Augustine Volcano, Alaska 4416

Keskinen, M.J., and Beget, J., 2006, Proximal tsunami deposits produced during the 1883 eruption of Augustine Volcano, Alaska [abs.]: Eos, Joint Assembly Supplement, v. 87, abstract PP43B-1245.

Preliminary volcano-hazard assessment for Okmok Volcano, Umnak Island, Alaska 4029

"Okmok Volcano is an active volcano located on the northeast end of Umnak Island, about 100 kilometers southwest of Dutch Harbor. The volcano is capped by a large, circular caldera, 10 kilometers in diameter and 500 to 800 meters deep, that formed during catastrophic eruptions about 12,000 and 2,000 years ago. Since then, more than a dozen separate vents within the caldera have erupted, some of them multiple times, to produce lava flows and widespread tephra (volcanic ash) deposits, with the most recent eruption occurring in 1997. Very large floods and lahars also have accompanied past eruptions, one of which destroyed an Aleut village in 1817. Multiple eruptions of lava and ash also have occurred from vents on the volcano's flanks. The volcano's long-term pattern of frequent eruptions, and dramatic intra-caldera deformation and accompanying seismicity since 1997 show that it remains active, and almost certainly will be the site of explosive and nonexplosive eruptions in the future. Understanding the variety of potential hazards associated with different types of volcanic processes typical of Okmok Volcano can help minimize the impacts of future eruptions."

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

Holocene tephrochronology of Sanak Island, Alaska 4134

Odorczuk, Diana, Finney, Bruce, and Beget, James, 2005, Holocene tephrochronology of Sanak Island, Alaska [abs.]: Abstracts with Programs - Geological Society of America, v. 37, n. 7, p. 38.

Preliminary results for interbasin correlation of tephra deposits in Lake Clark National Park, Alaska 4136

Bowes, M.J., Heiser, P.A., Beget, James, and Wallace, Kristi, 2005, Preliminary results for interbasin correlation of tephra deposits in Lake Clark National Park, Alaska [abs.]: Abstracts with Programs - Geological Society of America, v. 37, n. 7, p. 38.

Eruptive history of Fisher Caldera, Alaska, USA 3771

"New field, compositional, and geochronologic data from Fisher Caldera, the largest of 12 Holocene calderas in Alaska, provide insights into the eruptive history and formation of this volcanic system. Prior to the caldera-forming eruption (CFE) 9400 years ago, the volcanic system consisted of a cluster of several small (~3 km3) stratocones, which were independently active between 66F144 and 9.4F0.2 ka. Fisher Caldera formed through a single eruption, which produced a thick dacitic fall deposit and two pyroclastic-flow deposits, a small dacitic flow and a compositionally mixed basaltic-dacitic flow. Thickness and grain-size data indicate that the fall deposit was dispersed primarily to the northeast, whereas the two flows were oppositely directed to the south and north. After the cataclysmic eruption, a lake filled much of the caldera during what may have been a significant quiescent period."

Stelling, P., Gardner, J. E., and Beget, J., 2005, Eruptive history of Fisher Caldera, Alaska, USA: Journal of Volcanology and Geothermal Research, v. 139, no. 3-4, p. 163-183.

Trace-element geochemistry of individual glass shards of the Old Crow Tephra and the age of the Delta glaciation, central Alaska 3618

Beget, J. E., and Keskinen, M. J., 2003, Trace-element geochemistry of individual glass shards of the Old Crow Tephra and the age of the Delta glaciation, central Alaska: in Westgate, J. A., (ed.), Special issue dedicated to Troy Pewe, Quaternary Research, v. 60, n. 1, p. 63-69.

Late Pliocene to late Pleistocene environments preserved at the Palisades Site, central Yukon River, Alaska 3619

Matheus, Paul, Beget, J. E., Mason, O. K., and Gelvin-Reymiller, Carol, 2003, Late Pliocene to late Pleistocene environments preserved at the Palisades Site, central Yukon River, Alaska: in Westgate, J. A., (ed.), Special issue dedicated to Troy Pewe, Quaternary Research, v. 60, n. 1, p. 33-43.

Preliminary volcano-hazard assessment for Shishaldin Volcano, Alaska 3380

"Shishaldin Volcano is a 2,857-meter-high stratovolcano on Unimak Island, the most easterly of the Aleutian Islands. It is located about 45 kilometers west of False Pass, a small, permanently inhabited fishing village on Unimak Island that has a summer population of about 100. Shishaldin Volcano is historically one of the most active volcanoes in the Aleutian Islands. Eruptive events have occurred on at least 39 occasions since the late 1700s, when Russian traders and explorers began keeping written records. The most recent eruptive episode occurred from February to July of 1999, when the volcano produced tephra plumes on several occasions and extensive scoria blankets, and lahars on two occasions. The largest explosive eruption, on April 19, 1999, sent ash higher than 16 kilometers above sea level. The ash cloud drifted southward with the wind over the North Pacific Ocean, causing local disruptions in air traffic."

Beget, 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.
full-text PDF : 2.25 MB

Destruction of an Aleut village by a catastrophic flood release from Okmok caldera, Umnak Island, Alaska 3512

Wolfe, B. A., and Beget, J. E., 2002, Destruction of an Aleut village by a catastrophic flood release from Okmok caldera, Umnak Island, Alaska [abs.]: Abstracts with Programs - Geological Society of America, v. 34, n. 6, p. unknown.

Geology and petrology of ejecta from the 1999 eruption of Shishaldin Volcano, Alaska 3487

Stelling, P., Beget, J., Nye, C., Gardner, J., Devine, J. D., and George, R. M. M., 2002, Geology and petrology of ejecta from the 1999 eruption of Shishaldin Volcano, Alaska: Bulletin of Volcanology, v. 64, n. 8, p. 548-561.

Continuous late Quaternary proxy climate records from loess in Beringia 3654

Beget, J. E., 2001, Continuous late Quaternary proxy climate records from loess in Beringia: Quaternary Science Reviews, v. 20, n. 1-3, p. 499-507.

Record of Late Holocene debris avalanches and lahars at Iliamna Volcano, Alaska 184

Waythomas, C. F., Miller, T. P., and Beget, J. E., 2000, Record of Late Holocene debris avalanches and lahars at Iliamna Volcano, Alaska: Journal of Volcanology and Geothermal Research, v. 104, n. 1, p. 97-130.

Preliminary volcano-hazard assessment for Makushin Volcano, Alaska 656

"Makushin Volcano is a 2,036-meter-high stratovolcano on Unalaska Island. The volcano is located 28 kilometers west of the towns of Dutch Harbor and Unalaska, the largest population centers in the Aleutian Islands and the principal fishing, shipping, and air-transportation hub for westernmost Alaska. Explosive eruptions of Makushin Volcano have occurred at least 17 times since the late 1700s, when written records began. These historic eruptions have been relatively small, sending ash 3 to 10 kilometers above the volcano summit and depositing ash mainly on the flanks of the volcano. Geologic studies show that larger explosive eruptions occurred more than two dozen times during the last several thousand years, generating more widespread ash layers. In addition, a series of very large eruptions about 8,800 to 8,000 years ago produced a 4-kilometer-diameter crater at the summit of the volcano and generated not only numerous pyroclastic flows and surges that traveled down valleys to the sea on the east, west, and north flanks of the volcano, but a debris avalanche and lateral blast that entered the sea on the north flank of Makushin Volcano."

Beget, J. E., Nye, C. J., and Bean, K. W., 2000, Preliminary volcano-hazard assessment for Makushin Volcano, Alaska: Alaska Division of Geological & Geophysical Surveys Report of Investigations RI 2000-4, 22 p., 1 sheet, scale 1:100,000.
full-text PDF : .87 MB
map sheet plate : 7.68 MB

(super 40) Ar/ (super 39) Ar dating of Quaternary low-potassium hornblende from a fine-grained Alaskan tephra by total laser-fusion 3698

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.

Late Pleistocene environments of the western Noatak basin, northwestern Alaska 2131

Elias, S. E., Hamilton, T. D., Edwards, M. E., Beget, J. E., Krumhardt, A. P., and Lavoie, C., 1999, Late Pleistocene environments of the western Noatak basin, northwestern Alaska: Geological Society of America Bulletin, v. 111, p. 769-789.

Giant landslides and coeval tsunamis in lower Cook Inlet, Alaska 941

Anders, A. M., and Beget, J. E., 1999, Giant landslides and coeval tsunamis in lower Cook Inlet, Alaska [abs.]: Abstracts with Programs - Geological Society of America, v. 31, n. 7, p. 48.

Deposits of the 1999 eruptions of Shishaldin Volcano, Unimak Island, Alaska 853

Beget, James, Nye, C. J., Gardner, James, Devine, Joe, and Stelling, Peter, 1999, Deposits of the 1999 eruptions of Shishaldin Volcano, Unimak Island, Alaska [abs.]: Eos, v. 80, n. 46, p. 1147.

New dates on Late Pleistocene dacitic tephra from the Mount Edgecumbe volcanic field, southeastern Alaska 310

Beget, J. E., and Motyka, R. J., 1998, New dates on Late Pleistocene dacitic tephra from the Mount Edgecumbe volcanic field, southeastern Alaska: Quaternary Research, v. 49, n. 1, p. 123-125.

Postglacial collapse and regrowth of Shishaldin Volcano, Alaska, requires sustained high eruption rates 978

Beget, J. E., Nye, C., and Stelling, P., 1998, Postglacial collapse and regrowth of Shishaldin Volcano, Alaska, requires sustained high eruption rates [abs.]: in Eos, v. 79, n. 17, p. 359.

Geologic map of the Makushin volcanic field, Unalaska Island, Alaska 2105

McConnell, V. S., Beget, J. E., Roach, A. L., Bean, K. W., and Nye, C. J., 1998, Geologic map of the Makushin volcanic field, Unalaska Island, Alaska: Alaska Division of Geological & Geophysical Surveys Report of Investigations RI 97-20, unpaged, 2 sheets, scale 1:63,360.

website with links to sheets in MrSID format

Tephrochronology and geochronology of the largest maars on earth, northern Alaska 2838

Beget, J. E., Layer, P. W., and Flowers, B., 1997, Tephrochronology and geochronology of the largest maars on earth, northern Alaska [abs.]: in IAVCEI General Assembly, Abstracts, p. 21.

The largest known maars on earth, Seward Peninsula, northwest Alaska 309

Beget, J. E., Hopkins, D. M., and Charron, S. D., 1996, The largest known maars on earth, Seward Peninsula, northwest Alaska: Arctic, v. 49, n. 1, Calgary, AB, Canada, Arctic Institute of North America, p. 62-69.

Geology and hazards of Iliamna Volcano, Alaska 2158

Miller, T. P., Beget, J. E., Stephens, C. D., and Moore, R. B., 1996, Geology and hazards of Iliamna Volcano, Alaska [abs.]: Eos, v. 77, n. 46, p. 815.

Frequent Holocene explosive eruptions at Makushin Volcano, Aleutian Islands, Alaska 2181

Bean, K. W., and Beget, J. E., 1996, Frequent Holocene explosive eruptions at Makushin Volcano, Aleutian Islands, Alaska [abs.]: Eos, v. 77, n. 46, p. 771.

Provisional geologic map of Augustine Volcano, Alaska 641

Waitt, R. B., and Beget, J. E., 1996, Provisional geologic map of Augustine Volcano, Alaska: U.S. Geological Survey Open-File Report OF 96-0516, 44 p., 1 plate, scale 1:25,000.
website with links to HTML text, PDF
PDF, missing figures : 340 KB
map in GIF format : 21 KB
full-text PDF : 2.6 MB
map sheet : 295 MB!

Dendrochronologic, archeologic, and radiocarbon data on Recent eruptions of Iliamna and Augustine volcanoes, Alaska 2154

Beget, James, 1996, Dendrochronologic, archeologic, and radiocarbon data on Recent eruptions of Iliamna and Augustine volcanoes, Alaska [abs.]: Eos, v. 77, n. 46, p. 814.

Tephrochronologic correlations between Quaternary loess and glacial sequences, Alaska 2725

Beget, J. E., 1995, Tephrochronologic correlations between Quaternary loess and glacial sequences, Alaska [abs.]: Geological Society of America - Abstracts with Programs, v. 27, n. 6, p. 61.

The 1883 and late-prehistoric eruptions of Augustine volcano, Alaska 167

The eruptive history of Augustine volcano has been characterized by cycles of growth and destruction of the volcano. Repeated failure of 5-10% of the edifice has produced mobile debris avalanches that reached the sea on all sides. High lava extrusion rates rapidly restore the volcano to its pre-failure configuration.

Siebert, Lee, Beget, J. E., and Glicken, Harry, 1995, The 1883 and late-prehistoric eruptions of Augustine volcano, Alaska: Journal of Volcanology and Geothermal Research, v. 66, n. 1, p. 367-395.

Multiple Quaternary eruptive centers and widespread tephras in Alaska 2214

Beget, J. E., 1995, Multiple Quaternary eruptive centers and widespread tephras in Alaska: Abstracts with Programs - Geological Society of America, v. 27, n. 5, p. 5.

Volcanic eruptions and tsunami generation in the eastern Aleutian arc: the geologic record 1898

Beget, J. E., 1994, Volcanic eruptions and tsunami generation in the eastern Aleutian arc: the geologic record [abs.]: Abstracts with Programs - Geological Society of America, v. 26, n. 7, p. A138.

Tsunamis from Mt. St. Augustine: genesis, hazards, travel-times, amplitudes and recurrence rates 1917

Kienle, J., Kowalik, Z., and Beget, J. E., 1994, Tsunamis from Mt. St. Augustine: genesis, hazards, travel-times, amplitudes and recurrence rates [abs.]: in Middle East Technical University, Dept. of Geological Engineering Special Publication 0002, IAVCEI, International Volcanological Congress, Abstracts, Ankara, Turkey, 1994, unpaged.

A 500-year-long record of tephra falls from Redoubt volcano and other volcanoes in upper Cook Inlet, Alaska 89

Volcanic ash layers preserved in glacial-lacustrine sediments at Skilak Lake on the Kenai Peninsula of southcentral Alaska constitute a record of eruptions at Redoubt Volcano and other Alaskan volcanoes which affected the upper Cook Inlet area during the last 500 years. High-resolution magnetic susceptibility profiling delineates similar sequences of tephra layers in several 1-m-long lake sediment cores. Electron microprobe analyses of glass shards from the tephras indicate correlation of some ash layers with known reference tephras from the source volcanoes, while other ash layers record previously unknown prehistoric eruptions. Skilak Lake cores contain ash from the historic 1912 Katmai eruption, the 1902 Redoubt eruption, and the 1883 Mount St. Augustine eruption as well as prehistoric ash layers erupted from Crater Peak at Mr. Spurr ca. 250-350 years ago, from Redoubt Volcano at ca. 300-400 years ago and again at ca. 350-450 years ago, and a 500-year-old ash from Mount St. Augustine.

Beget, J. E., Stihler, S. D., and Stone, D. B., 1994, A 500-year-long record of tephra falls from Redoubt volcano and other volcanoes in upper Cook Inlet, Alaska: in Miller, T. P. and Chouet, B. A., (eds.), The 1989-1990 eruptions of Redoubt Volcano, Alaska, Journal of Volcanology and Geothermal Research, v. 62, n. 1-4, p. 55-67.

Postglacial eruption history of Redoubt volcano, Alaska 90

Volcaniclastic deposits preserved in valleys on the flanks of Redoubt Volcano comprise a record of the volcano's postglacial eruption history. The oldest and largest deposit is the Harriet Point debris avalanche, emplaced more than 10,500 yr B.P. This debris avalanche travelled more than 30 km down the Redoubt Creek valley to Cook Inlet. About 3600 yr B.P., a massive slope failure of Redoubt Volcano produced at least two lahars that travelled 30 km down the Crescent River valley (Riehle et al., 1981 ). A series of smaller eruptions between ca. 3600-1800 yr B.P. generated additional lahars and floods that affected the upper Crescent River valley. A pyroclastic fan on the south flank of Redoubt Volcano probably also formed during this time interval.

Beget, J. E., and Nye, C. J., 1994, Postglacial eruption history of Redoubt volcano, Alaska: in Miller, T. P. and Chouet, B. A., (eds.), The 1989-1990 eruptions of Redoubt Volcano, Alaska, Journal of Volcanology and Geothermal Research, v. 62, n. 1, p. 31-54.

Tephrochronology of Late Quaternary glacial moraines in the Valley of Ten Thousand Smokes, Katmai, Alaska 312

Beget, J. E., and Pinney, DeAnne, 1994, Tephrochronology of Late Quaternary glacial moraines in the Valley of Ten Thousand Smokes, Katmai, Alaska [abs.]: Abstracts with Programs - Geological Society of America, v. 26, n. 7, p. A513.

Melting properties of volcanic ash 2267

"Volcanic ash is a widespread product of eruptions of volcanoes that are located around rim of the Pacific Ocean. Ash is formed by explosive fragmentation and quenching of magma (crystals +melt + gas) during an eruption. Melt in the magma is quenched to a glass when the temperature is rapidly lowered upon exposure to atmospheric conditions. The explosive character of these volcanoes is caused by the silica-rich melt, which often contains dissolved volatile components, such as H20 or SO2. Crystallization of mineral phases (e.g., plagioclase, pyroxene, hornblende, Fe-Ti oxides, etc.) gradually enriches non-crystallizing components in the melt."

Swanson, S. E., and Beget, J. E., 1994, Melting properties of volcanic ash: in Casadevall, T. J., (ed.), Volcanic ash and aviation safety: proceedings of the First international symposium on Volcanic ash and aviation safety, U.S. Geological Survey Bulletin B 2047, p. 87-92.
full-text PDF : 210 KB

Reply to the comment by Jirikowic, J.L. and Sonett, C.P. on Varve counting vs. tephrochronology, Cs-137, and Pb-210 dating: A comparative test at Skilak Lake, Alaska 803

Stihler, S. D., Stone, D. B., and Beget, J. E., 1993, Reply to the comment by Jirikowic, J.L. and Sonett, C.P. on Varve counting vs. tephrochronology, Cs-137, and Pb-210 dating: A comparative test at Skilak Lake, Alaska: Geology, v. 21, p. 763-764.

Calderas produced by hydromagmatic eruptions through permafrost in Northwest Alaska 2324

Beget, J. E., 1993, Calderas produced by hydromagmatic eruptions through permafrost in Northwest Alaska [abs.]: in Kargel, J. S., Moore, Jeffrey, and Parker, Timothy, (eds.), Workshop on the Martian northern plains; Sedimentological, periglacial, and paleoclimatic evolution, Lunar and Planetary Institute Technical Report 93-04, Fairbanks, AK, Aug. 12-14, 1993, Part 1, p. 3.

Cyclic formation of debris avalanches at Mount St Augustine volcano 91

Volcanic debris avalanches have been seen at many volcanoes since the 1980 eruption of Mount St. Helens, but typically only one or two avalanche deposits are identified at each eruptive centre, suggesting that catastrophic slope failures are rare or even unique events in the lifetime of a volcano.

Beget, J. E., and Kienle, J., 1992, Cyclic formation of debris avalanches at Mount St Augustine volcano: Nature, v. 356, n. 6371, p. 701-704.

Tephrochronology of Mt. St. Augustine Volcano, southern Cook Inlet, Alaska 306

Beget, J. E., 1992, Tephrochronology of Mt. St. Augustine Volcano, southern Cook Inlet, Alaska [abs.]: Eos, v. 73, n. 43, p. 613.

Dynamics and kinematics of recent pyroclastic flows in Alaska: Katmai 1912/Mt. St. Augustine 1986/Mt. Redoubt 1990 307

Beget, J. E., 1992, Dynamics and kinematics of recent pyroclastic flows in Alaska: Katmai 1912/Mt. St. Augustine 1986/Mt. Redoubt 1990 [abs.]: in International Geological Congress, 29, Abstracts, v. 2, Kyoto, Japan, Aug. 24-Sept. 3, 1992, p. 486.

"Varve" counting vs. tephrochronology, Cs-137,and Pb-210 dating: A comparative test at Skilak Lake, Alaska 804

Stihler, S. D., Stone, D. B., and Beget, J. E., 1992, "Varve" counting vs. tephrochronology, Cs-137,and Pb-210 dating: A comparative test at Skilak Lake, Alaska: Geology, v. 20, p. 1019-1022.

Possible climatic impact of large Alaskan and Kamchatkan tephra eruptions 1515

Beget, J. E., and Keskinen, M., 1992, Possible climatic impact of large Alaskan and Kamchatkan tephra eruptions [abs.]: in International Geological Congress, 29, Abstracts, Kyoto, Japan, Aug. 24-Sept. 3, 1992, p. 500.

Geology and geochemistry of Mt. Douglas volcano, eastern Aleutian arc, Alaska 2001

Nye, C. J., Beget, J. E., Motyka, R. J., and Layer, P. W., 1992, Geology and geochemistry of Mt. Douglas volcano, eastern Aleutian arc, Alaska [abs.]: Eos, v. 73, p. 634.

"Caldera" formation by unusually large phreatomagmatic eruptions through permafrost in arctic Alaska 2610

Beget, J. E., and Mann, D., 1992, "Caldera" formation by unusually large phreatomagmatic eruptions through permafrost in arctic Alaska [abs.]: Eos, v. 73, n. 43, p. 636.

Age, extent and climatic significance of the c. 3400 BP Aniakchak tephra, western Alaska, USA 1477

Beget, J. E., Mason, O. K., and Anderson, P. M., 1992, Age, extent and climatic significance of the c. 3400 BP Aniakchak tephra, western Alaska, USA: The Holocene, v. 2, n. 1, p. 51-56.

Compositional equivalence of tephra and lava groundmass glasses in the 1989-90 eruption of Mount Redoubt, Alaska: implication for eruption monitoring 469

Swanson, S. E., Beget, J. E., and McGimsey, R. G., 1991, Compositional equivalence of tephra and lava groundmass glasses in the 1989-90 eruption of Mount Redoubt, Alaska: implication for eruption monitoring [abs.]: Abstracts with Programs - Geological Society of America, v. 23, n. 5, p. A396.

Tsunami hazard from debris avalanches off Augustine Volcano, Alaska 2674

Waitt, R. B., and Beget, J. E., 1991, Tsunami hazard from debris avalanches off Augustine Volcano, Alaska [abs.]: Eos, v. 72, n. 44, p. 227-228.

Thermal properties of volcanic ash 2788

Swanson, S. E., and Beget, J. E., 1991, Thermal properties of volcanic ash [abs.]: in Casadevall, T. J., (ed.), First international symposium on volcanic ash and aviation safety, U.S. Geological Survey Circular C 1065, p. 43-44.

Correlation of the Holocene Jarvis Creek, Tangle Lakes, Cantwell, and Hayes tephras in south-central and central Alaska 92

Beget, J. E., Reger, R. D., Pinney, DeAnne, Gillispie, Tom, and Campbell, Kathy, 1991, Correlation of the Holocene Jarvis Creek, Tangle Lakes, Cantwell, and Hayes tephras in south-central and central Alaska: Quaternary Research, v. 35, n. 2, p. 174-189.

Old Crow Tephra found at the Palisades of the Yukon, Alaska 1525

Beget, J. E., Edwards, Mary, Hopkins, David, Keskinen, Mary, and Kukla, G. J., 1991, Old Crow Tephra found at the Palisades of the Yukon, Alaska: Quaternary Research, v. 35, n. 2, p. 291-297.

Frequency and regional extent of ash eruptions from Alaskan volcanoes 1527

Beget, J. E., Swanson, S. E., and Stone, D. B., 1991, Frequency and regional extent of ash eruptions from Alaskan volcanoes [abs.]: in Casadevall, T. J., (ed.), First international symposium on volcanic ash and aviation safety, U.S. Geological Survey Circular C 1065, p. 13.

The Stampede Tephra: a middle Pleistocene marker bed in glacial and eolian deposits of central Alaska 1558

Beget, J. E., and Keskinen, Mary, 1991, The Stampede Tephra: a middle Pleistocene marker bed in glacial and eolian deposits of central Alaska: Canadian Journal of Earth Sciences [Journal Canadien des Sciences de la Terre], v. 28, n. 7, p. 991-1002.

Late Pleistocene volcanic deposits near the Valley of Ten Thousand Smokes, Katmai National Park, Alaska 1576

Pinney, D. S., and Beget, J. E., 1991, Late Pleistocene volcanic deposits near the Valley of Ten Thousand Smokes, Katmai National Park, Alaska: in Reger, R. D., (ed.), Short notes on Alaskan geology 1991, Alaska Division of Geological & Geophysical Surveys Professional Report PR 0111, p. 45-53.

Extent of prehistoric debris avalanche and lahars from Mt. Redoubt, Alaska 311

Beget, J. E., and Nye, C. J., 1990, Extent of prehistoric debris avalanche and lahars from Mt. Redoubt, Alaska [abs.]: Eos, v. 71, n. 43, p. 1706.

Quaternary tephrochronology near the Valley of Ten Thousand Smokes, Katmai National Park, Alaska 1615

Pinney, D. S., and Beget, J. E., 1990, Quaternary tephrochronology near the Valley of Ten Thousand Smokes, Katmai National Park, Alaska [abs.]: Eos, v. 71, n. 43, p. 1721.

Paleoclimatic forcing of magentic susceptiblity variations in Alaskan loess during the late Quaternary 2726

Beget, J. E., Stone, D. B., and Hawkins, D. B., 1990, Paleoclimatic forcing of magentic susceptiblity variations in Alaskan loess during the late Quaternary: Geology, v. 18, p. 40-43.

Volcanic activity in the Cook Inlet region, Alaska, recorded by tephra in sediment cores from Skilak Lake 1593

Stone, D. B., Stihler, S. D., and Beget, J., 1990, Volcanic activity in the Cook Inlet region, Alaska, recorded by tephra in sediment cores from Skilak Lake [abs.]: Eos, v. 71, n. 17, p. 647.

Postglacial eruption history of Mt. St. Augustine, southern Cook Inlet, Alaska 1678

Beget, J. E., 1989, Postglacial eruption history of Mt. St. Augustine, southern Cook Inlet, Alaska [abs.]: in Continental magmatism: abstracts, New Mexico Bureau of Mines and Mineral Resources Bulletin 0131, p. 19.

Late-Quaternary volcanic and glacial stratigraphy at Windy Creek, Katmai National Monument, Alaska 1662

Pinney, D. S., and Beget, J. E., 1989, Late-Quaternary volcanic and glacial stratigraphy at Windy Creek, Katmai National Monument, Alaska [abs.]: Abstracts with Programs - Geological Society of America, v. 21, n. 5, p. 129.

Rheological and kinematic characteristics of the 1986 pyroclastic flows at Mt. St. Augustine, Alaska 1681

Limke, A. J., and Beget, J. E., 1989, Rheological and kinematic characteristics of the 1986 pyroclastic flows at Mt. St. Augustine, Alaska [abs.]: in Continental magmatism: abstracts, New Mexico Bureau of Mines and Mineral Resources Bulletin 0131, p. 163.

Density and void ratio on emplacement of a small pyroclastic flow, Mount St. Augustine, Alaska 1687

Beget, J. E., and Limke, A. J., 1989, Density and void ratio on emplacement of a small pyroclastic flow, Mount St. Augustine, Alaska: Journal of Volcanology and Geothermal Research, v. 39, n. 4, p. 349-353.

Two-dimensional kinematic and rheological modeling of the 1912 pyroclastic flow, Katmai, Alaska 1708

Beget, J. E., and Limke, A. J., 1988, Two-dimensional kinematic and rheological modeling of the 1912 pyroclastic flow, Katmai, Alaska: Bulletin of Volcanology, v. 50, n. 3, p. 148-160.

Tephras and sedimentology of frozen Alaskan loess 1720

Beget, J. E., 1988, Tephras and sedimentology of frozen Alaskan loess: in Senneset, Kaare, (ed.), International Conference on Permafrost, 5, Proceedings, v. 1, Trondheim, Norway, Aug. 2-5, 1988, p. 672-677.

AVO Staff Directory: