Publications
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Volcanic processes and geology of Augustine Volcano, Alaska
Augustine Island (volcano) in lower Cook Inlet, Alaska, has erupted repeatedly in late-Holocene and historical times. Eruptions typically beget high-energy volcanic processes. Most notable are bouldery debris avalanches containing immense angular clasts shed from summit domes. Coarse deposits of these avalanches form much of Augustine's lower flanks. A new geologic map at 1:25,000 scale depicts th
Authors
Richard B. Waitt, James E. Beget
Modified Mercalli Intensity Assignments for the May 16, 1909, Northern Plains Earthquake
We combine newspaper accounts and Nuttli's (1976) isoseismal map to assign modified Mercalli intensity (MMI) at 76 towns for the May 16, 1909 Northern Plains earthquake. The earthquake was felt across more than 1,500,000 km2 in the States of Minnesota, Montana, North Dakota, South Dakota, and Wyoming and the Provinces of Alberta, Manitoba, Ontario, and Saskatchewan.
Authors
W. H. Bakun, M. C. Stickney, G. Rogers
Transport slopes, sediment cover, and bedrock channel incision in the Henry Mountains, Utah
[1] Field data from channels in the Henry Mountains of Utah demonstrate that abundant coarse sediment can inhibit fluvial incision into bedrock by armoring channel beds (the cover effect). We compare several small channels that share tributary junctions and have incised into the same sedimentary bedrock unit (Navajo Sandstone) but contain differing amounts of coarse diorite clasts owing to the spa
Authors
Joel P. L. Johnson, Kelin X. Whipple, Leonard Sklar, Thomas C. Hanks
Science-Based Strategies for Sustaining Coral Ecosystems
Coral ecosystems and their natural capital are at risk. Greenhouse gas emissions, overfishing, and harmful land-use practices are damaging our coral reefs. Overwhelming scientific evidence indicates that the threats are serious, and if they are left unchecked, the ecological and social consequences will be significant and widespread. Although the primary stressors to coral ecosystems are known, sc
Authors
San Andreas array failure is only a temporary setback
No abstract available.
Authors
Mark D. Zoback, William L. Ellsworth, Stephen H. Hickman
Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2008
Between January 1 and December 31, 2008, the Alaska Volcano Observatory (AVO) located 7,097 earthquakes of which 5,318 occurred within 20 kilometers of the 33 volcanoes monitored by the AVO. Monitoring highlights in 2008 include the eruptions of Okmok Caldera, and Kasatochi Volcano, as well as increased unrest at Mount Veniaminof and Redoubt Volcano. This catalog includes descriptions of: (1) loca
Authors
James P. Dixon, Scott D. Stihler
The crowbar chronicles and other tales
The analysis of historical earthquakes often relies heavily on archival accounts describing the effects of shaking on structures and people. Newspaper articles are among the most common, useful, and easily found sources of information. Dramatic earthquake effects are almost certain to have made the news during historic times; the challenge for modern seismologists is not to be overly swayed by art
Authors
Susan E. Hough
A deployment of broadband seismic stations in two deep gold mines, South Africa
In-mine seismic networks throughout the TauTona and Mponeng gold mines provide precise locations and seismic source parameters of earthquakes. They also support small-scale experimental projects, including NELSAM (Natural Earthquake Laboratory in South African Mines), which is intended to record, at close hand, seismic rupture of a geologic fault that traverses the project region near the deepest
Authors
Arthur F. McGarr, Margaret S. Boettcher, Jon Peter B. Fletcher, Malcolm J. S. Johnston, R. Durrheim, S. Spottiswoode, A. Milev
Finding Trapped Miners by Using a Prototype Seismic Recording System Made from Music-Recording Hardware
The goal of this project was to use off-the-shelf music recording equipment to build and test a prototype seismic system to listen for people trapped in underground chambers (mines, caves, collapsed buildings). Previous workers found that an array of geophones is effective in locating trapped miners; displaying the data graphically, as well as playing it back into an audio device (headphones) at h
Authors
Thomas L. Pratt
Estimating Casualties for Large Earthquakes Worldwide Using an Empirical Approach
We developed an empirical country- and region-specific earthquake vulnerability model to be used as a candidate for post-earthquake fatality estimation by the U.S. Geological Survey's Prompt Assessment of Global Earthquakes for Response (PAGER) system. The earthquake fatality rate is based on past fatal earthquakes (earthquakes causing one or more deaths) in individual countries where at least fou
Authors
Kishor Jaiswal, David J. Wald, Mike Hearne
The January 2006 volcanic-tectonic earthquake swarm at Mount Martin, Alaska
On January 8, 2006, a swarm of volcanic-tectonic earthquakes began beneath Mount Martin at the southern end of the Katmai volcanic cluster. This was the first recorded swarm at Mount Martin since continuous seismic monitoring began in 1996. The number of located earthquakes increased during the next four days, reaching a peak on January 11. For the next two days, the seismic activity decreased, an
Authors
James P. Dixon, John A. Power