Publications
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Simulations of cataclysmic outburst floods from Pleistocene Glacial Lake Missoula
Using a flow domain that we constructed from 30 m digital-elevation model data of western United States and Canada and a two-dimensional numerical model for shallow-water flow over rugged terrain, we simulated outburst floods from Pleistocene Glacial Lake Missoula. We modeled a large, but not the largest, flood, using initial lake elevation at 1250 m instead of 1285 m. Rupture of the ice dam, cent
Authors
Roger P. Denlinger, D. R. H. O'Connell
Eruption of Alaska volcano breaks historic pattern
In the late morning of 12 July 2008, the Alaska Volcano Observatory (AVO) received an unexpected call from the U.S. Coast Guard, reporting an explosive volcanic eruption in the central Aleutians in the vicinity of Okmok volcano, a relatively young (~2000-year-old) caldera. The Coast Guard had received an emergency call requesting assistance from a family living at a cattle ranch on the flanks of t
Authors
Jessica Larsen, Christina A. Neal, Peter Webley, Jeff Freymueller, Matthew Haney, Stephen McNutt, David Schneider, Stephanie Prejean, Janet Schaefer, Rick L. Wessels
Three short videos by the Yellowstone Volcano Observatory
This is a collection of videos of unscripted interviews with Jake Lowenstern, who is the Scientist in Charge of the Yellowstone Volcano Observatory (YVO). YVO was created as a partnership among the U.S. Geological Survey (USGS), Yellowstone National Park, and University of Utah to strengthen the long-term monitoring of volcanic and earthquake unrest in the Yellowstone National Park region. Yellows
Authors
Stephen Wessells, Jake Lowenstern, Dina Venezky
Quaternary science reviews Pacific Basin tsunami hazards associated with mass flows in the Aleutian arc of Alaska
We analyze mass-flow tsunami generation for selected areas within the Aleutian arc of Alaska using results from numerical simulation of hypothetical but plausible mass-flow sources such as submarine landslides and volcanic debris avalanches. The Aleutian arc consists of a chain of volcanic mountains, volcanic islands, and submarine canyons, surrounded by a low-relief continental shelf above about
Authors
Christopher F. Waythomas, Philip Watts, Fengyan Shi, James T. Kirby
A field guide to Newberry Volcano, Oregon
Newberry Volcano is located in central Oregon at the intersection of the Cascade Range and the High Lava Plains. Its lavas range in age from ca. 0.5 Ma to late Holocene. Erupted products range in composition from basalt through rhyolite and cover ~3000 km2. The most recent caldera-forming eruption occurred ~80,000 years ago. This trip will highlight a revised understanding of the volcano's history
Authors
Robert A. Jenson, Julie M. Donnelly-Nolan, Daniele McKay
Improved constraints on the estimated size and volatile content of the Mount St. Helens magma system from the 2004–2008 history of dome growth and deformation
The history of dome growth and geodetic deflation during the 2004–2008 Mount St. Helens eruption can be fit to theoretical curves with parameters such as reservoir volume, bubble content, initial overpressure, and magma rheology, here assumed to be Newtonian viscous, with or without a solid plug in the conduit center. Data from 2004–2008 are consistent with eruption from a 10–25 km3 reservoir cont
Authors
Larry G. Mastin, Mike Lisowski, Evelyn Roeloffs, Nick Beeler
Precision leveling and geodetic GPS observations performed on Surtsey between 1967 and 2002
The load on the crust from the ~ 0.8 km3 of eruptive products of the Surtsey eruption is expected to lead to subsidence of the Surtsey island by sagging of the lithosphere, compaction of material, and slumping of the volcanic edifice. Immediately after the eruption ended in the summer of 1967 a levelling line was established across the island to monitor this expected subsidence. The line originall
Authors
Erik Sturkell, P. Einarsson, Halldor Geirsson, E. Tryggvason, James G. Moore, Rosa Ólafsdottir
The July-August 2008 hydrovolcanic eruption of Okmok Volcano, Umnak Island, Alaska
No abstract available
Authors
Christina A. Neal, Jessica F. Larsen, Janet Schaefer
A multidisciplinary effort to assign realistic source parameters to models of volcanic ash-cloud transport and dispersion during eruptions
During volcanic eruptions, volcanic ash transport and dispersion models (VATDs) are used to forecast the location and movement of ash clouds over hours to days in order to define hazards to aircraft and to communities downwind. Those models use input parameters, called “eruption source parameters”, such as plume height H, mass eruption rate Ṁ, duration D, and the mass fraction m63 of erupted debri
Authors
Larry G. Mastin, Marianne C. Guffanti, R. Servranckx, P. Webley, S. Barsotti, K. Dean, A. Durant, John W. Ewert, A. Neri, W.I. Rose, David J. Schneider, Lee Siebert, B. Stunder, G. Swanson, A. Tupper, A. Volentik, Christopher F. Waythomas
Modeling hazardous mass flows Geoflows09: Mathematical and computational aspects of modeling hazardous geophysical mass flows; Seattle, Washington, 9–11 March 2009
A recent workshop at the University of Washington focused on mathematical and computational aspects of modeling the dynamics of dense, gravity-driven mass movements such as rock avalanches and debris flows. About 30 participants came from seven countries and brought diverse backgrounds in geophysics; geology; physics; applied and computational mathematics; and civil, mechanical, and geotechnical e
Authors
Richard M. Iverson, Randall J. LeVeque
Laguna del Maule volcanic field: Eruptive history of a Quaternary basalt-to-rhyolite distributed volcanic field on the Andean rangecrest in central Chile
The Laguna del Maule (LdM) volcanic field, which surrounds the 54-km2 lake of that name, covers ~500 km2 of rugged glaciated terrain with Quaternary lavas and tuffs that extend for 40 km westward from the Argentine frontier and 30 km north-south from the Rio Campanario to Laguna Fea. The distributed rear-arc volcanic field is contiguous with the Tatara-San Pedro stratovolcano complex on the volcan
Authors
Wes Hildreth, Estanislao Godoy, Judy Fierstein, Brad Singer