Publications
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Chemical Analyses of Pre-Holocene Rocks from Medicine Lake Volcano and Vicinity, Northern California
Chemical analyses are presented in an accompanying table (Table 1) for more than 600 pre-Holocene rocks collected at and near Medicine Lake Volcano, northern California. The data include major-element X-ray fluorescence (XRF) analyses for all of the rocks plus XRF trace element data for most samples, and instrumental neutron activation analysis (INAA) trace element data for many samples. In additi
Authors
Julie M. Donnelly-Nolan
Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2006
Between January 1 and December 31, 2006, AVO located 8,666 earthquakes of which 7,783 occurred on or near the 33 volcanoes monitored within Alaska. Monitoring highlights in 2006 include: an eruption of Augustine Volcano, a volcanic-tectonic earthquake swarm at Mount Martin, elevated seismicity and volcanic unrest at Fourpeaked Mountain, and elevated seismicity and low-level tremor at Mount Veniami
Authors
James P. Dixon, Scott D. Stihler, John A. Power, Cheryl Searcy
Monitoring the Earth's dynamic magnetic field
The mission of the U.S. Geological Survey's Geomagnetism Program is to monitor the Earth's magnetic field. Using ground-based observatories, the Program provides continuous records of magnetic field variations covering long timescales; disseminates magnetic data to various governmental, academic, and private institutions; and conducts research into the nature of geomagnetic variations for purposes
Authors
Jeffrey J. Love, David Applegate, John B. Townshend
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, but a few
Authors
Robert O. Fournier, Michael M. Moore
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 geologic units an
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
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
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 Islands of th
Authors
R. G. McGimsey, C. A. Neal, J. P. Dixon, Sergey Ushakov
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 records selecte
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
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 consists of se
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
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 deformation
Authors
Maurizio Battaglia, Daniel Dzurisin, John Langbein, Jerry Svarc, David P. Hill
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 a restles
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
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 describes
Authors
M. R. Stevens, C. R. Bossong, M.G. Rupert, A.J. Ranalli, E.W. Cassidy, A.D. Druliner