Publications
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Hazard information management during the autumn 2004 reawakening of Mount St. Helens volcano, Washington
The 2004 reawakening of Mount St. Helens quickly
caught the attention of government agencies as well as the
international news media and the public. Immediate concerns
focused on a repeat of the catastrophic landslide and blast
event of May 18, 1980, which remains a vivid memory for
many individuals. Within several days of the onset of accelerating seismicity, media inquiries increased expone
Authors
Carolyn L. Driedger, Christina A. Neal, Tom H. Knappenberger, Deborah H. Needham, Robert B. Harper, William P. Steele
Geology and Surface Processes on Titan
The surface of Titan has been revealed globally, if incompletely, by Cassini observations at infrared and radar wavelengths as well as locally by the instruments on the Huygens probe. Extended dune fields, lakes, mountainous terrain, dendritic erosion patterns and erosional remnants indicate dynamic surface processes. Valleys, small-scale gullies and rounded cobbles such as those observed at the H
Authors
Ralf Jaumann, Randolph L. Kirk, Ralph D. Lorenz, Rosaly M.C. Lopes, Ellen Stofan, Elizabeth P. Turtle, Horst Uwe Keller, Charles A. Wood, Christophe Sotin, Laurence A. Soderblom, Martin G. Tomasko
Geological and geophysical evaluation of the mechanisms of the great 1899 Yakutat Bay earthquakes
We have used tectonic, geologic, and seismologic observations to reevaluate the mechanisms and seismotectonic significance of the two great (Mw = 8.1 and 8.2) September 1899 Yakutat Bay earthquakes. In their comprehensive study of these earthquakes between 1905 and 1910, Tarr and Martin (1912) showed that these events were accompanied by shoreline changes in Yakutat Bay that ranged from 14.4 m eme
Authors
George Plafker, Wayne R. Thatcher
Overview of the 2004 to 2006, and continuing, eruption of Mount St. Helens, Washington
Rapid onset of unrest at Mount St. Helens on September 23, 2004, initiated an uninterrupted lava-dome-building eruption that continues to the time of writing this overview (spring 2006) for a volume of papers focused on this eruption. About three weeks of intense seismic unrest and localized surface uplift, punctuated by four brief explosions, constituted a ventclearing phase, during which there w
Authors
William E. Scott, David R. Sherrod, Cynthia A. Gardner
Paleoseismicity and neotectonics of the Aleutian subduction zone — An overview
The Aleutian subduction zone is one of the most seismically active plate boundaries and the source of several of the world’s largest historic earthquakes. The structural architecture of the subduction zone varies considerably along its length. At the eastern end is a tectonically complex collision zone where the allochthonous Yakutat terrane is moving northwest into mainland Alaska. West of the co
Authors
Gary A. Carver, George Plafker
Managing public and media response to a reawakening volcano: lessons from the 2004 eruptive activity of Mount St. Helens
Volcanic eruptions and other infrequent, large-scale
natural disturbances pose challenges and opportunities for
public-land managers. In the days and weeks preceding an
eruption, there can be considerable uncertainty surrounding
the magnitude and areal extent of eruptive effects. At the same
time, public and media interest in viewing developing events
is high and concern for public safety on
Authors
Peter M. Frenzen, Michael T. Matarrese
Toward a time-dependent probabilistic seismic hazard analysis for Alaska
We report on a time-dependent seismic hazard analysis for Alaska and the Aleutians to complement our recently completed time-independent map. Whereas the time-independent map treats all sources as statistically independent, the time-dependent analysis is based on calculations of the conditional probability of occurrence for the next 50 years by using a Brownian Passage Time model for the seismic s
Authors
Oliver S. Boyd, Yuehua Zeng, Charles G. Bufe, Robert L. Wesson, Fred Pollitz, Jeanne L. Hardebeck
Does a boundary of the Wrangell Block extend through southern Cook Inlet and Shelikof Strait, Alaska?
In southcentral Alaska, the boundaries of two different tectonic blocks extend southwestward from the Denali Fault toward Cook Inlet and Shelikof Strait. We use offshore multichannel seismic reflection data and oil-well stratigraphy to evaluate whether local geologic structures are compatible with boundaries of either tectonic block and with the relative motion expected across the block boundaries
Authors
Michael A. Fisher, Ray W. Sliter, Florence L. Wong
Note from the Hubbert Quorum
No abstract available.
Authors
Steven E. Ingebritsen, Shaul Hurwitz, E. E. Brodsky
Numerical modeling of rainfall thresholds for shallow landsliding in the Seattle, Washington, area
The temporal forecasting of landslide hazard has typically relied on empirical relations between rainfall characteristics and landslide occurrence to identify conditions that may cause shallow landslides. Here, we describe an alternate, deterministic approach to define rainfall thresholds for landslide occurrence in the Seattle, Washington, area. This approach combines an infinite slope-stability
Authors
Jonathan W. Godt, Jonathan P. McKenna
Variability of passive gas emissions, seismicity, and deformation during crater lake growth at White Island Volcano, New Zealand, 2002-2006
We report on 4 years of airborne measurements of CO2, SO2, and H2S emission rates during a quiescent period at White Island volcano, New Zealand, beginning in 2003. During this time a significant crater lake emerged, allowing scrubbig processes to be investigated. CO2 emissions varied from a baseline of 250 to >2000 t d-1 and demonstrated clear annual cycling that was consistent with numbers of ea
Authors
C. Werner, T. Hurst, B. Scott, S. Sherburn, B.W. Christenson, K. Britten, J. Cole-Baker, B. Mullan
Modeled tephra ages from lake sediments, base of Redoubt Volcano, Alaska
A 5.6-m-long lake sediment core from Bear Lake, Alaska, located 22 km southeast of Redoubt Volcano, contains 67 tephra layers deposited over the last 8750 cal yr, comprising 15% of the total thickness of recovered sediment. Using 12 AMS 14C ages, along with the 137Cs and 210Pb activities of recent sediment, we evaluated different models to determine the age-depth relation of the core, and to deter
Authors
C.J. Schiff, D. S. Kaufman, K.L. Wallace, A. Werner, T.-L. Ku, T. A. Brown