Publications
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Taming of a wild research well in Yellowstone National Park during November 1992 Taming of a wild research well in Yellowstone National Park during November 1992
Much of our current understanding of Yellowstone's geothermal areas comes from research drilling by the USGS during 1967 and 1968. Thirteen wells were drilled in thermal areas around the park. Scientists collected waters and rocks, measured temperatures and pressures and performed other tests to characterize the shallow subsurface at Yellowstone. Most wells were plugged and abandoned...
Authors
Robert O. Fournier, Michael M. Moore
Database of the geology and thermal activity of Norris Geyser Basin, Yellowstone National Park Database of the geology and thermal activity of Norris Geyser Basin, Yellowstone National Park
This dataset contains contacts, geologic units and map boundaries from Plate 1 of USGS Professional Paper 1456, 'The Geology and Remarkable Thermal Activity of Norris Geyser Basin, Yellowstone National Park, Wyoming.' The features are contained in the Annotation, basins_poly, contours, geology_arc, geology_poly, point_features, and stream_arc feature classes as well as a table of...
Authors
Kathryn Flynn, Brita Graham Wall, Donald E. White, Roderick A. Hutchinson, Terry E.C. Keith, Laura Clor, Joel E. Robinson
Introduction to planetary and space science special issue: Mars polar processes Introduction to planetary and space science special issue: Mars polar processes
No abstract available.
Authors
Timothy N. Titus, Anthony Colaprete, Thomas H. Prettyman
2005 volcanic activity in Alaska, Kamchatka, and the Kurile Islands: Summary of events and response of the Alaska Volcano Observatory 2005 volcanic activity in Alaska, Kamchatka, and the Kurile Islands: Summary of events and response of the Alaska Volcano Observatory
The Alaska Volcano Observatory (AVO) responded to eruptive activity or suspected volcanic activity at or near 16 volcanoes in Alaska during 2005, including the high profile precursory activity associated with the 2005–06 eruption of Augustine Volcano. AVO continues to participate in distributing information about eruptive activity on the Kamchatka Peninsula, Russia, and in the Kurile...
Authors
R. G. McGimsey, C.A. Neal, J. P. Dixon, Sergey Ushakov
Maximum spectral demands in the near-fault region Maximum spectral demands in the near-fault region
The Next Generation Attenuation (NGA) relationships for shallow crustal earthquakes in the western United States predict a rotated geometric mean of horizontal spectral demand, termed GMRotI50, and not maximum spectral demand. Differences between strike-normal, strike-parallel, geometric-mean, and maximum spectral demands in the near-fault region are investigated using 147 pairs of...
Authors
Yin-Nan Huang, Andrew S. Whittaker, Nicolas Luco
Shear wave structure of Umbria and Marche, Italy, strong motion seismometer sites Affected by the 1997-98 Umbria-Marche, Italy, earthquake sequence Shear wave structure of Umbria and Marche, Italy, strong motion seismometer sites Affected by the 1997-98 Umbria-Marche, Italy, earthquake sequence
A long sequence of earthquakes, eight with magnitudes between 5 and 6, struck the Umbria and Marche regions of central Italy between September 26, 1997 and July 1998. The earthquake swarm caused severe structural damage, particularly to masonry buildings, and resulted in the loss of twelve lives and about 150 injuries. The source of the events was a single seismogenic structure that...
Authors
Robert Kayen, Giuseppe Scasserra, Jonathan P. Stewart, Giuseppe Lanzo
Converting NAD83 GPS Heights Into NAVD88 Elevations With LVGEOID, a Hybrid Geoid Height Model for the Long Valley Volcanic Region, California Converting NAD83 GPS Heights Into NAVD88 Elevations With LVGEOID, a Hybrid Geoid Height Model for the Long Valley Volcanic Region, California
A GPS survey of leveling benchmarks done in Long Valley Caldera in 1999 showed that the application of the National Geodetic Survey (NGS) geoid model GEOID99 to tie GPS heights to historical leveling measurements would significantly underestimate the caldera ground deformation (known from other geodetic measurements). The NGS geoid model was able to correctly reproduce the shape of the...
Authors
Maurizio Battaglia, Daniel Dzurisin, John O. Langbein, Jerry Svarc, David P. Hill
Volcan Baru: Eruptive History and Volcano-Hazards Assessment Volcan Baru: Eruptive History and Volcano-Hazards Assessment
Volcan Baru is a potentially active volcano in western Panama, about 35 km east of the Costa Rican border. The volcano has had four eruptive episodes during the past 1,600 years, including its most recent eruption about 400?500 years ago. Several other eruptions occurred in the prior 10,000 years. Several seismic swarms in the 20th century and a recent swarm in 2006 serve as reminders of...
Authors
David R. Sherrod, James W. Vallance, Arkin Tapia Espinosa, John P. McGeehin
Post-Wildfire Hydrologic Hazards in the Wildland Urban Interface of Colorado and the Western United States Post-Wildfire Hydrologic Hazards in the Wildland Urban Interface of Colorado and the Western United States
Following a wildfire, such as the 2002 Missionary Ridge fire, a number of hydrologic hazards may develop that can have an important impact on water resources, businesses, homes, reservoirs, roads, and utilities in the wildland urban interface (areas where homes and commercial developments are interspersed with wildlands) in mountainous areas of the Western United States. This fact sheet...
Authors
M. R. Stevens, C. R. Bossong, M.G. Rupert, A.J. Ranalli, E.W. Cassidy, A.D. Druliner
A slab fragment wedged under Tokyo and its tectonic and seismic implications A slab fragment wedged under Tokyo and its tectonic and seismic implications
The Philippine Sea and Pacific plate slabs both subduct beneath Tokyo, and so their configuration and seismic potential have been subject to intensive study. Previous work suggests that the Philippine Sea slab extends up to 100 km northwest of Tokyo and subducts to a depth of 90 km beneath the Kanto basin, where it is folded against the underlying Pacific slab. Here we evaluate seismic...
Authors
Shinji Toda, Ross Stein, Stephen H. Kirby, S.B. Bozkurt
Timing of degassing and plagioclase growth in lavas erupted from Mount St. Helens, 2004-2005, from 210Po-210Pb-226Ra disequilibria Timing of degassing and plagioclase growth in lavas erupted from Mount St. Helens, 2004-2005, from 210Po-210Pb-226Ra disequilibria
Disequilibrium between 210Po, 210Pb, and 226Ra was measured on rocks and plagioclase mineral separates erupted during the first year of the ongoing eruption of Mount St. Helens. The purpose of this study was to monitor the volatile fluxing and crystal growth that occurred in the weeks, years, and decades leading up to eruption. Whole-rock samples were leached in dilute HCl to remove...
Authors
Mark K. Reagan, Kari M. Cooper, John S. Pallister, Carl R. Thornber, Matthew Wortel
Constraints and conundrums resulting from ground-deformation measurements made during the 2004-2005 dome-building eruption of Mount St. Helens, Washington Constraints and conundrums resulting from ground-deformation measurements made during the 2004-2005 dome-building eruption of Mount St. Helens, Washington
A prolonged period of dome growth at Mount St. Helens starting in September-October 2004 provides an opportunity to study how the volcano deforms before, during, and after an eruption by using modern instruments and techniques, such as global positioning system (GPS) receivers and interferometric synthetic aperture radar (InSAR), together with more traditional ones, including tiltmeters
Authors
Daniel Dzurisin, Michael Lisowski, Michael P. Poland, David R. Sherrod, Richard G. LaHusen