Publications
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Frequency-dependent seismic attenuation in the eastern United States as observed from the 2011 central Virginia earthquake and aftershock sequence
Ground shaking due to earthquakes in the eastern United States (EUS) is felt at significantly greater distances than in the western United States (WUS) and for some earthquakes it has been shown to display a strong preferential direction. Shaking intensity variation can be due to propagation path effects, source directivity, and/or site amplification. In this paper, we use S and Lg waves recorded
Authors
Daniel E. McNamara, Lind Gee, Harley M. Benz, Martin Chapman
Strong ground motions generated by earthquakes on creeping faults
A tenet of earthquake science is that faults are locked in position until they abruptly slip during the sudden strain-relieving events that are earthquakes. Whereas it is expected that locked faults when they finally do slip will produce noticeable ground shaking, what is uncertain is how the ground shakes during earthquakes on creeping faults. Creeping faults are rare throughout much of the Earth
Authors
Ruth A. Harris, Norman A. Abrahamson
Finite-fault slip model of the 2011 Mw 5.6 Prague, Oklahoma earthquake from regional waveforms
The slip model for the 2011 Mw 5.6 Prague, Oklahoma, earthquake is inferred using a linear least squares methodology. Waveforms of six aftershocks recorded at 21 regional stations are used as empirical Green's functions (EGFs). The solution indicates two large slip patches: one located around the hypocenter with a depth range of 3–5.5 km; the other located to the southwest of the epicenter with a
Authors
Xiaodan Sun, Stephen H. Hartzell
The UCERF3 grand inversion: Solving for the long‐term rate of ruptures in a fault system
We present implementation details, testing, and results from a new inversion‐based methodology, known colloquially as the “grand inversion,” developed for the Uniform California Earthquake Rupture Forecast (UCERF3). We employ a parallel simulated annealing algorithm to solve for the long‐term rate of all ruptures that extend through the seismogenic thickness on major mapped faults in California wh
Authors
Morgan T. Page, Edward H. Field, Kevin Milner, Peter M. Powers
Tsunami forecast by joint inversion of real-time tsunami waveforms and seismic of GPS data: application to the Tohoku 2011 tsunami
Correctly characterizing tsunami source generation is the most critical component of modern tsunami forecasting. Although difficult to quantify directly, a tsunami source can be modeled via different methods using a variety of measurements from deep-ocean tsunameters, seismometers, GPS, and other advanced instruments, some of which in or near real time. Here we assess the performance of different
Authors
Wei Yong, Andrew V. Newman, Gavin P. Hayes, Vasily V. Titov, Liujuan Tang
Post-earthquake relaxation using a spectral element method: 2.5-D case
The computation of quasi-static deformation for axisymmetric viscoelastic structures on a gravitating spherical earth is addressed using the spectral element method (SEM). A 2-D spectral element domain is defined with respect to spherical coordinates of radius and angular distance from a pole of symmetry, and 3-D viscoelastic structure is assumed to be azimuthally symmetric with respect to this po
Authors
Fred Pollitz
Earthquake catalog for estimation of maximum earthquake magnitude, Central and Eastern United States: Part A, Prehistoric earthquakes
Computation of probabilistic earthquake hazard requires an estimate of Mmax, the maximum earthquake magnitude thought to be possible within a specified geographic region. This report is Part A of an Open-File Report that describes the construction of a global catalog of moderate to large earthquakes, from which one can estimate Mmax for most of the Central and Eastern United States and adjacent Ca
Authors
Russell L. Wheeler
Unified facilities criteria 3-301-01: structural engineering
This Unified Facility Criteria (UFC) provides requirements for structures designed and
constructed for the Department of Defense (DoD). These technical requirements are
based on the 2012 International Building Code (IBC 2012), as modified by UFC 1-200-
01. This information shall be used by structural engineers to develop design
calculations, specifications, plans, and design-build Requests for
Authors
Sean M. McGowan, Sanaz Rezaeian, Nicolas Luco
Technical implementation plan for the ShakeAlert production system: an Earthquake Early Warning system for the West Coast of the United States
Earthquake Early Warning (EEW) systems can provide as much as tens of seconds of warning to people and automated systems before strong shaking arrives. The United States Geological Survey (USGS) and its partners are developing such an EEW system, called ShakeAlert, for the West Coast of the United States. This document describes the technical implementation of that system, which leverages existing
Authors
Douglas D. Given, Elizabeth S. Cochran, Thomas Heaton, Egill Hauksson, Richard Allen, Peggy Hellweg, John Vidale, Paul Bodin
Geodesy- and geology-based slip-rate models for the Western United States (excluding California) national seismic hazard maps
The 2014 National Seismic Hazard Maps for the conterminous United States incorporate additional uncertainty in fault slip-rate parameter that controls the earthquake-activity rates than was applied in previous versions of the hazard maps. This additional uncertainty is accounted for by new geodesy- and geology-based slip-rate models for the Western United States. Models that were considered includ
Authors
Mark D. Petersen, Yuehua Zeng, Kathleen M. Haller, Robert McCaffrey, William C. Hammond, Peter Bird, Morgan Moschetti, Zhengkang Shen, Jayne Bormann, Wayne Thatcher
Intraplate seismic hazard: evidence for distributed strain and implications for seismic hazard
No abstract available.
Authors
Susan E. Hough
Modeling the effects of source and path heterogeneity on ground motions of great earthquakes on the Cascadia Subduction Zone Using 3D simulations
We ran finite‐difference earthquake simulations for great subduction zone earthquakes in Cascadia to model the effects of source and path heterogeneity for the purpose of improving strong‐motion predictions. We developed a rupture model for large subduction zone earthquakes based on a k−2 slip spectrum and scale‐dependent rise times by representing the slip distribution as the sum of normal modes
Authors
Andrew Delorey, Arthur Frankel, Pengcheng Liu, William J. Stephenson