Publications
Filter Total Items: 1848
Photomosaics and logs of trenches on the San Andreas Fault at Arano Flat near Watsonville, California
We present photomosaics and logs of the walls of trenches excavated for a paleoseismic
study at Arano Flat, one of two sites along the San Andreas fault in the Santa Cruz Mountains
on the Kelley-Thompson Ranch. At this location, the fault consists of a narrow
zone along the northeast side of a low ridge adjacent to a possible sag pond and extends about
60-70 meters across a broad alluvial flat
Authors
Thomas E. Fumal, Gordon F. Heingartner, Laura Samrad, Timothy E. Dawson, John C. Hamilton, John N. Baldwin
Photomosaics and logs of trenches on the San Andreas Fault, Thousand Palms Oasis, California
We present photomosaics and logs of the walls of trenches excavated for a paleoseismic study at Thousand Palms Oasis (Fig. 1). The site
is located on the Mission Creek strand of the San Andreas fault zone, one of two major active strands of the fault in the Indio Hills along the
northeast margin of the Coachella Valley (Fig. 2). The Coachella Valley section is the most poorly understood major pa
Authors
Thomas E. Fumal, William T. Frost, Christopher Garvin, John C. Hamilton, Monique Jaasma, Michael J. Rymer
Thermal and chemical variations in subcrustal cratonic lithosphere: Evidence from crustal isostasy
The Earth's topography at short wavelengths results from active tectonic processes, whereas at long wavelengths it is largely determined by isostatic adjustment for the density and thickness of the crust. Using a global crustal model, we estimate the long-wavelength topography that is not due to crustal isostasy. Our most important finding is that cratons are generally depressed by 300 to 1500 m i
Authors
Walter D. Mooney, John E. Vidale
Location and age database for selected foraminifer samples collected by Exxon Petroleum geologists in California
Most of the geologic maps published for central California before 1960 were made without the benefit of age determinations from microfossils. The ages of Cretaceous and Tertiary rocks in the mostly poorly exposed and structurally complex sedimentary rocks represented in the Coast Ranges are critical in determining stratigraphic succession or lack of it, and in determining whether the juxtaposition
Authors
Earl E. Brabb, John M. Parker
Station corrections for the Katmai Region Seismic Network
Most procedures for routinely locating earthquake hypocenters within a local network are constrained to using laterally homogeneous velocity models to represent the Earth's crustal velocity structure. As a result, earthquake location errors may arise due to actual lateral variations in the Earth's velocity structure. Station corrections can be used to compensate for heterogeneous velocity structur
Authors
Cheryl K. Searcy
Consequences of viscous drag beneath a transform fault
A transform fault is modeled as a vertical cut through an elastic layer (schizosphere) of thickness overlying a viscous substrate (plastosphere). We consider a steady transform motion accommodated in the schizosphere wholly by slip on the fault and in the plastosphere, insofar as possible, by viscous flow. For the case where the viscosity in the plastosphere is strain rate dependent but independen
Authors
James C. Savage, A. H. Lachenbruch
Glossary of interest to earthquake and engineering seismologists
No abstract available.
Authors
K. Aki, William H. K. Lee
Data report for the main line of the PSINE seismic survey across the San Andreas Fault and SAFOD Site near Parkfield, California
In October and November 1998, the U.S. Geological Survey, Virginia Polytechnic
Institute, Stanford University, and Geometrics Corporation jointly acquired a highresolution
seismic reflection/refraction profile across the San Andreas Fault Zone (SAFZ)
and the proposed San-Andreas-Fault-Observatory-at-Depth (SAFOD) drill site located
near Parkfield, California (Fig. 1a). We refer to this seismic sur
Authors
R. D. Catchings, M. R. Goldman, M. J. Rymer, G. Gandhok, G. S. Fuis
Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2002
The Alaska Volcano Observatory (AVO), a cooperative program of the U.S. Geological Survey, the Geophysical Institute of the University of Alaska Fairbanks, and the Alaska Division of Geological and Geophysical Surveys, has maintained seismic monitoring networks at historically active volcanoes in Alaska since 1988 (Power and others, 1993; Jolly and others, 1996; Jolly and others, 2001; Dixon and o
Authors
James P. Dixon, Scott D. Stihler, John A. Power, Guy Tytgat, Seth C. Moran, John Sánchez, Steve Estes, Stephen R. McNutt, John Paskievitch
Geologic map and digital database of the Redlands 7.5' quadrangle, San Bernardino and Riverside Counties, California
This geologic database of the Redlands 7.5' quadrangle was prepared by the Southern California Areal Mapping Project (SCAMP), a regional geologic-mapping project sponsored jointly by the U.S. Geological Survey and the California Geological Survey. The database was developed as a contribution to the National Cooperative Geologic Mapping Program's National Geologic Map Database, and is intended to p
Authors
Jonathan C. Matti, Douglas M. Morton, Brett F. Cox, Katherine J. Kendrick, Pamela M. Cossette, Bradley Jones, Stephen A. Kennedy
By
Natural Hazards Mission Area, Energy and Minerals Mission Area, Earthquake Hazards Program, Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Groundwater and Streamflow Information Program, Earthquake Science Center, Geology, Minerals, Energy, and Geophysics Science Center
Empirical modified Mercalli intensity site corrections for towns in eastern North America
Modified Mercalli intensity (MMI) assignments for earthquakes in eastern North America (ENA) were used by Bakun et al. (2003) and Bakun and Hopper (in press) to develop models for estimating the location and moment magnitude M of earthquakes in ENA from MMI observations. The MMI empirical site corrections developed and used by Bakun et al. (2003) and Bakun and Hopper (in press) are listed in this
Authors
W. H. Bakun, M. G. Hopper
The Sidebar Computer Program, a seismic-shaking intensity meter: users' manual and software description
The SideBar computer program provides a visual display of seismic shaking intensity as recorded at one specific seismograph. This software allows a user to tap into the seismic data recorded on that specific seismograph and to display the overall level of shaking at the single location where that seismograph resides (usually the same place the user is). From this shaking level, SideBar also estima
Authors
John R. Evans