Publications
Filter Total Items: 2585
Data for Quaternary faults in western Montana
The "World Map of Major Active Faults" Task Group is compiling published fault data, developing a digital
database of the fault data, and preparing a series of maps for the United States and other countries in the western
Hemisphere. The data is intended to portray the locations, ages, and activity rates of major earthquake-related
features such as faults, folds, and liquefaction features that hav
Authors
Kathleen M. Haller, Richard L. Dart, Michael N. Machette, Michael C. Stickney
Methane hydrate dissociation rates at 0.1 MPa and temperatures above 272 K
We performed rapid depressurization experiments on methane hydrate under isothermal conditions above 272 K to determine the amount and rate of methane evolution. Sample temperatures rapidly drop below 273 K and stabilize near 272.5 K during dissociation. This thermal anomaly and the persistence of methane hydrate are consistent with the reported recovery of partially dissociated methane hydrate fr
Authors
S. Circone, Laura A. Stern, Stephen H. Kirby, John C. Pinkston, William B Durham
Duration of sedimentation of Creede Formation from 40Ar/39Ar ages
The Oligocene Creede Formation was deposited in the moat of the Creede caldera, which formed as a result of eruption of ythe Snowshoe Mountains Tuff. The Creede Formation in the two moat drill holes contains ash layers that are considered fallout tuffs derived from Fisher Dacite volcanoes that were erupting during accumulation of the Creede Formation. The duration of sedimentation of the Creede Fo
Authors
Marvin A. Lanphere
Variability of site response in Seattle, Washington
Ground motion from local earthquakes and the SHIPS (Seismic Hazards Investigation in Puget Sound) experiment is used to estimate site amplification factors in Seattle. Earthquake and SHIPS records are analyzed by two methods: (1) spectral ratios relative to a nearby site on Tertiary sandstone, and (2) a source/site spectral inversion technique. Our results show site amplifications between 3 and 4
Authors
S. Hartzell, D. Carver, E. Cranswick, A. Frankel
Potential seismic hazards and tectonics of the upper Cook Inlet basin, Alaska, based on analysis of Pliocene and younger deformation
The Cook Inlet basin is a northeast-trending forearc basin above the Aleutian subduction zone in southern Alaska. Folds in Cook Inlet are complex, discontinuous structures with variable shape and vergence that probably developed by right-transpressional deformation on oblique-slip faults extending downward into Mesozoic basement beneath the Tertiary basin. The most recent episode of deformation ma
Authors
Peter J. Haeussler, Ronald L. Bruhn, Thomas L. Pratt
Hydrogen defects in α-Al2O3 and water weakening of sapphire and alumina ceramics between 600°C and 1000°C: II. Mechanical properties
Hydrogen impurities in alumina have been introduced by hydrothermal annealing (see part I). In this paper, we report on reductions in the flow strength of α-Al2O3 single crystals and polycrystals associated with hydrogen incorporation. Prior to deformation, α-Al2O3 single crystal and ceramic specimens were annealed in the presence of supercritical water at 850° or 900°C, under 1500 MPa pressure. S
Authors
J. Castaing, A. K. Kronenberg, S. H. Kirby, T. E. Mitchell
Archive report for most USGS seismic refraction investigations conducted between 1978 and 1991
In 1978, the U.S. Geological Survey (USGS) began acquiring seismic refraction data throughout the U.S. and Saudi Arabia. Numerous professional papers have been published in the literature and the technical details and goals for most of these surveys have been described in USGS Open-file reports (Table 1). This report describes the archiving of the data.
Authors
Janice M. Murphy
Taking the Earth's Pulse
During the past 35 years, scientists have developed a vast network of seismometers that record earthquakes, volcanic eruptions, and nuclear explosions throughout the world. Seismographic data support disaster response, scientific research, and global security. With this network, the United States maintains world leadership in monitoring the greatest natural and technological events that threaten o
Authors
Robert L. Woodward, Harley Mitchell Benz, Kaye M. Shedlock, William M. Brown
A filter circuit board for the Earthworm Seismic Data Acquisition System
The Earthworm system is a seismic network data acquisition and processing system used by the Northern California Seismic Network as well as many other seismic networks. The input to the system is comprised of many realtime electronic waveforms fed to a multi-channel digitizer on a PC platform. The digitizer consists of one or more National Instruments Corp. AMUX–64T multiplexer boards attached to
Authors
Edward Gray Jensen
Report for explosion and earthquake data acquired in the 1999 Seismic Hazards Investigation of Puget Sound (SHIPS), Washington
This report describes the acquisition, processing, and quality of seismic reflection and refraction data obtained in the Seattle basin, central Puget Lowland, western Washington, in September 1999 during the Seismic Hazards Investigation of Puget Sound (SHIPS). As a sequel to the 1998 SHIPS air gun experiment (also known as 'Wet SHIPS'), the 1999 experiment, nicknamed 'Dry SHIPS,' acquired a 112-k
Authors
Thomas M. Brocher, Thomas L. Pratt, Kate C. Miller, Anne M. Tréhu, Catherine M. Snelson, Craig S. Weaver, Ken C. Creager, Robert S. Crosson, Uri S. ten Brink, Marcos G. Alvarez, Steven H. Harder, Isa Asudeh
SMSIM--Fortran programs for simulating ground motions from earthquakes: Version 2.0.--a revision of OFR 96-80-A
A simple and powerful method for simulating ground motions is based on the assumption that the amplitude of ground motion at a site can be specified in a deterministic way, with a random phase spectrum modified such that the motion is distributed over a duration related to the earthquake magnitude and to distance from the source. This method of simulating ground motions often goes by the name "the
Authors
David M. Boore