Publications
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Maps and documentation of seismic CPT soundings in the central, eastern, and western United States
Nine hundred twenty seven seismic cone penetration tests (CPT) in a variety of geologic deposits and geographic locations were conducted by the U.S. Geological Survey (USGS) primarily between 1998 and 2008 for the purpose of collecting penetration test data to evaluate the liquefaction potential of different types of surficial geologic deposits (table 1). The evaluation is described in Holzer and
Authors
Thomas L. Holzer, Thomas E. Noce, Michael J. Bennett
Preliminary atlas of active shallow tectonic deformation in the Puget Lowland, Washington
This atlas presents an up-to-date map compilation of the geological and geophysical observations that underpin interpretations of active, surface-deforming faults in the Puget Lowland, Washington. Shallow lowland faults are mapped where observations of deformation from paleoseismic, seismic-reflection, and potential-field investigations converge. Together, results from these studies strengthen the
Authors
Elizabeth A. Barnett, Ralph A. Haugerud, Brian L. Sherrod, Craig S. Weaver, Thomas L. Pratt, Richard J. Blakely
Postseismic relaxation following the 1989 MS7.1 Loma Prieta earthquake, central California
The postseismic relaxation (postseismic displacement less displacement that would have occurred at the preseismic rate) measured by GPS and leveling following the 1989 MS7.1 Loma Prieta earthquake is reexamined. The temporal dependence of the relaxation over the first 1200 days postseismic is well described by 1 − e−t/τ, where τ = 414 ± 92 days. (Quoted uncertainties are standard deviations.) Tha
Authors
James C. Savage, Jerry L. Svarc
The 2007 M5.4 Alum Rock, California, earthquake: Implications for future earthquakes on the central and southern Calaveras Fault
[1] The similarity of seismograms recorded by two seismic stations demonstrate that the 31 October 2007 moment magnitude M5.4 Alum Rock earthquake is a repeat of a 1955 ML5.5 earthquake. Both occurred on Oppenheimer et al.'s (1990) Zone V “stuck patch” on the central Calaveras fault, providing new support for their model of Calaveras fault earthquake activity. We suggest that Zone V fails only in
Authors
David H. Oppenheimer, William H. Bakun, Tom Parsons, Robert W. Simpson, John Boatwright, R. A. Uhrhammer
Kiholo Bay, Hawaii, earthquake sequence of 2006: Relationship of the main shock slip with locations and source parameters of aftershocks
We study the source process of the Kīholo Bay earthquake (MW 6.7), which occurred beneath the northwest part of the Island of Hawai‘i on 15 October 2006, and static stress drops of small earthquakes that occurred in 2006 and 2007 around the main shock including aftershocks. We relocate the aftershocks to determine the fault plane from the two nodal planes. The relocated aftershocks define an E‐W t
Authors
Takuji Yamada, Paul G. Okubo, Cecily Wolfe
Golden Gate Bridge response: a preliminary study with low amplitude earthquake data
No abstract available.
Authors
Mehmet Çelebi, Christopher Stephens, Erol Kalkan
Program and abstracts of the Second Tsunami Source Workshop; July 19-20, 2010
In response to a request by the National Oceanic and Atmospheric Administration (NOAA) for computing tsunami propagations in the western Pacific, Eric Geist asked Willie Lee for assistance in providing parameters of earthquakes which may be future tsunami sources. The U.S. Geological Survey (USGS) Tsunami Source Working Group (TSWG) was initiated in August 2005. An ad hoc group of diverse expertis
Authors
W.H.K. Lee, S. H. Kirby, M. F. Diggles
Practical guidelines to select and scale earthquake records for nonlinear response history analysis of structures
Earthquake engineering practice is increasingly using nonlinear response history analysis (RHA) to demonstrate performance of structures. This rigorous method of analysis requires selection and scaling of ground motions appropriate to design hazard levels. Presented herein is a modal-pushover-based scaling (MPS) method to scale ground motions for use in nonlinear RHA of buildings and bridges. In
Authors
Erol Kalkan, Anil K. Chopra
Proceedings of the 25th Himalaya-Karakoram-Tibet Workshop
For a quarter of a century the Himalayan-Karakoram-Tibet (HKT) Workshop has provided scientists studying the India-Asia collision system a wonderful opportunity for workshop-style discussion with colleagues working in this region. In 2010, HKT returns to North America for the first time since 1996. The 25th international workshop is held from June 7 to10 at San Francisco State University, Californ
Authors
Mary L. Leech, Simon L. Klemperer, Walter D. Mooney
Locations and magnitudes of historical earthquakes in the Sierra of Ecuador (1587–1996)
The whole territory of Ecuador is exposed to seismic hazard. Great earthquakes can occur in the subduction zone (e.g. Esmeraldas, 1906, Mw8.8), whereas lower magnitude but shallower and potentially more destructive earthquakes can occur in the highlands. This study focuses on the historical crustal earthquakes of the Andean Cordillera. Several large cities are located in the Interandean Valley, am
Authors
Celine Beauval, Hugo Yepes, William H. Bakun, Jose Egred, Alexandra Alvarado, Juan-Carlos Singaucho
Periodic, chaotic, and doubled earthquake recurrence intervals on the deep San Andreas Fault
Earthquake recurrence histories may provide clues to the timing of future events, but long intervals between large events obscure full recurrence variability. In contrast, small earthquakes occur frequently, and recurrence intervals are quantifiable on a much shorter time scale. In this work, I examine an 8.5-year sequence of more than 900 recurring low-frequency earthquake bursts composing tremor
Authors
David R. Shelly
A magnitude 7.1 earthquake in the Tacoma Fault Zone— A plausible scenario for the southern Puget Sound region, Washington
The U.S. Geological Survey and cooperating scientists have recently assessed the effects of a magnitude 7.1 earthquake on the Tacoma Fault Zone in Pierce County, Washington. A quake of comparable magnitude struck the southern Puget Sound region about 1,100 years ago, and similar earthquakes are almost certain to occur in the future. The region is now home to hundreds of thousands of people, who wo
Authors
Joan Gomberg, Brian L. Sherrod, Craig Weaver, Art Frankel