Publications
Filter Total Items: 2585
Prediction of spectral acceleration response ordinates based on PGA attenuation
Developed herein is a new peak ground acceleration (PGA)-based predictive model for 5% damped pseudospectral acceleration (SA) ordinates of free-field horizontal component of ground motion from shallow-crustal earthquakes. The predictive model of ground motion spectral shape (i.e., normalized spectrum) is generated as a continuous function of few parameters. The proposed model eliminates the class
Authors
V. Graizer, E. Kalkan
Possible deep fault slip preceding the 2004 Parkfield earthquake, inferred from detailed observations of tectonic tremor
Earthquake predictability depends, in part, on the degree to which sudden slip is preceded by slow aseismic slip. Recently, observations of deep tremor have enabled inferences of deep slow slip even when detection by other means is not possible, but these data are limited to certain areas and mostly the last decade. The region near Parkfield, California, provides a unique convergence of several ye
Authors
David R. Shelly
OxCal: Versatile tool for developing paleoearthquake chronologies: A primer
Ages of paleoearthquakes (events), i.e., evidence of earthquakes inferred from the geologic record, provide a critical constraint on estimation of the seismic hazard posed by an active fault. The radiocarbon calibration program OxCal (4.0.3 and above; Bronk Ramsey 2007, 2001) provides paleoseismologists with a straightforward but rigorous means of estimating these event ages and their uncertaintie
Authors
J. J. Lienkaemper, C.B. Ramsey
A Viscoelastic earthquake simulator with application to the San Francisco Bay region
Earthquake simulation on synthetic fault networks carries great potential for characterizing the statistical patterns of earthquake occurrence. I present an earthquake simulator based on elastic dislocation theory. It accounts for the effects of interseismic tectonic loading, static stress steps at the time of earthquakes, and postearthquake stress readjustment through viscoelastic relaxation of t
Authors
Fred F. Pollitz
On baseline corrections and uncertainty in response spectrafor baseline variations commonly encountered in digital accelerograph records
Most digital accelerograph recordings are plagued by long-period drifts, best seen in the velocity and displacement time series obtained from integration of the acceleration time series. These drifts often result in velocity values that are nonzero near the end of the record. This is clearly unphysical and can lead to inaccurate estimates of peak ground displacement and long-period spectral respon
Authors
Sinan Akkar, David M. Boore
Validation of the rupture properties of the 2001 Kunlun, China (Ms = 8.1), earthquake from seismological and geological observations
We determine the finite-fault slip distribution of the 2001 Kunlun earthquake (Ms = 8.1) by inverting teleseismic waveforms, as constrained by geological and remote sensing field observations. The spatial slip distribution along the 400-km-long fault was divided into five segments in accordance with geological observations. Forward modelling of regional surface waves was performed to estimate the
Authors
Yi-Ying Wen, Ma Kuo-Fong, Teh-Ru Alex Song, Walter D. Mooney
Developing framework to constrain the geometry of the seismic rupture plane on subduction interfaces a priori - A probabilistic approach
A key step in many earthquake source inversions requires knowledge of the geometry of the fault surface on which the earthquake occurred. Our knowledge of this surface is often uncertain, however, and as a result fault geometry misinterpretation can map into significant error in the final temporal and spatial slip patterns of these inversions. Relying solely on an initial hypocentre and CMT mechan
Authors
G.P. Hayes, D. J. Wald
Data from theodolite measurements of creep rates on San Francisco Bay region faults, California
IntroductionOur purpose is to annually update our creep-data archive on San Francisco Bay region active faults for use by the scientific research community. Earlier data (1979-2001) were reported in Galehouse (2002) and were analyzed and described in detail in a summary report (Galehouse and Lienkaemper, 2003). A complete analysis of our earlier results obtained on the Hayward Fault was presented
Authors
Forrest S. McFarland, James J. Lienkaemper, S. John Caskey
Diffusion-equation representations of landform evolution in the simplest circumstances: Appendix C
The diffusion equation is one of the three great partial differential equations of classical physics. It describes the flow or diffusion of heat in the presence of temperature gradients, fluid flow in porous media in the presence of pressure gradients, and the diffusion of molecules in the presence of chemical gradients. [The other two equations are the wave equation, which describes the propagati
Authors
Thomas C. Hanks
Software for inference of dynamic ground strains and rotations and their errors from short baseline array observations of ground motions
In two previous articles we presented a formulation for inferring the strains and rotations of the ground beneath a seismic array having a finite footprint. In this article we derive expressions for the error covariance matrices of the inferred strains and rotations, and we present software for the calculation of ground strains, rotations, and their variances from short baseline array ground-motio
Authors
Paul Spudich, Jon B. Fletcher
Logs of paleoseismic excavations across the Central Range Fault, Trinidad
This publication makes available maps and trench logs associated with studies of the Central Range Fault, part of the South American-Caribbean plate boundary in Trinidad. Our studies were conducted in 2001 and 2002.
We mapped geomorphic features indicative of active faulting along the right-lateral, Central Range Fault, part of the South American-Caribbean plate boundary in Trinidad. We excava
Authors
Christopher J. Crosby, Carol S. Prentice, John Weber, Daniel Ragona
Extension of Gutenberg‐Richter distribution to MW −1.3, no lower limit in sight
With twelve years of seismic data from TauTona Gold Mine, South Africa, we show that mining‐induced earthquakes follow the Gutenberg‐Richter relation with no scale break down to the completeness level of the catalog, at moment magnitude MW −1.3. Events recorded during relatively quiet hours in 2006 indicate that catalog detection limitations, not earthquake source physics, controlled the previousl
Authors
Margaret S. Boettcher, Arthur F. McGarr, Malcolm J. S. Johnston