Publications
Filter Total Items: 2573
Hundreds of earthquakes per day: The 2014 Guthrie, Oklahoma, Earthquake Sequence
A remarkable increase in seismic activity in Oklahoma since 2009 has been shown
to correlate closely with enhanced hydrocarbon extraction and associated
wastewater disposal; 99% of this recent Oklahoma earthquake activity has
occurred within 15 km of a call II injection well (Ellsworth, 2013). In response
to this increase in seismic activity, the U.S. Geological Survey (USGS) partnered
with the
Authors
Harley M. Benz, Nicole D McMahon, R Aster, Daniel E. McNamara, David J. Harris
Pore-pressure sensitivities to dynamic strains: observations in active tectonic regions
Triggered seismicity arising from dynamic stresses is often explained by the Mohr-Coulomb failure criterion, where elevated pore pressures reduce the effective strength of faults in fluid-saturated rock. The seismic response of a fluid-rock system naturally depends on its hydro-mechanical properties, but accurately assessing how pore-fluid pressure responds to applied stress over large scales in s
Authors
Andrew J. Barbour
A long-term earthquake rate model for the central and eastern United States from smoothed seismicity
I present a long-term earthquake rate model for the central and eastern United States from adaptive smoothed seismicity. By employing pseudoprospective likelihood testing (L-test), I examined the effects of fixed and adaptive smoothing methods and the effects of catalog duration and composition on the ability of the models to forecast the spatial distribution of recent earthquakes. To stabilize th
Authors
Morgan P. Moschetti
Aftershock collapse vulnerability assessment of reinforced concrete frame structures
In a seismically active region, structures may be subjected to multiple earthquakes, due to mainshock–aftershock phenomena or other sequences, leaving no time for repair or retrofit between the events. This study quantifies the aftershock vulnerability of four modern ductile reinforced concrete (RC) framed buildings in California by conducting incremental dynamic analysis of nonlinear MDOF analyti
Authors
Meera Raghunandan, Abbie B. Liel, Nicolas Luco
Decay of S‐wave amplitudes with distance for earthquakes in the Charlevoix, Quebec, area: Effects of radiation pattern and directivity
The decay of the Fourier spectral amplitudes of S waves over distances of 10–80 km near Charlevoix, Quebec, was determined using waveforms from seven earthquakes with MN 3.3–5.4. The S‐wave spectral amplitudes were corrected for site response and source amplitude by normalizing the coda‐wave spectrum at a fixed time after the origin time. The amplitude decay with distance was found to be less stee
Authors
Arthur Frankel
Simulation of earthquake ground motions in the eastern U.S. using deterministic physics-based and stochastic approaches
No abstract available.
Authors
Sanaz Rezaeian, Stephen H. Hartzell, S. Xiaodan, C. Mendoza
Optimal interpolation of spatially discretized geodetic data
No abstract available.
Authors
Zheng-Kang Shen, Min Wang, Yuehua Zeng, Fan Wang
Southern San Andreas Fault seismicity is consistent with the Gutenberg-Richter magnitude-frequency distribution
The magnitudes of any collection of earthquakes nucleating in a region are generally observed to follow the Gutenberg-Richter (G-R) distribution. On some major faults, however, paleoseismic rates are higher than a G-R extrapolation from the modern rate of small earthquakes would predict. This, along with other observations, led to formulation of the characteristic earthquake hypothesis, which hold
Authors
Morgan T. Page, Karen Felzer
Trench logs, terrestrial lidar system imagery, and radiocarbon data from the kilometer-62 site on the Greenville Fault, southeastern Alameda County, California, 2014
In 2014, we investigated an abrupt 8.5-meter (m), right-laterally deflected stream channel located near the Greenville Fault in southeastern Alameda County, California (-121.56224° E, 37.53430° N) that we discovered using 0.5-m resolution, 2011 aerial lidar imagery flown along the active fault trace. Prior to trenching we surveyed the site using a terrestrial lidar system (TLS) to document the exa
Authors
James J. Lienkaemper, Stephen B. DeLong, Nikita N. Avdievitch, Alexandra J. Pickering, Thomas P. Guilderson
Tsunami recurrence in the eastern Alaska-Aleutian arc: A Holocene stratigraphic record from Chirikof Island, Alaska
Despite the role of the Alaska-Aleutian megathrust as the source of some of the largest earthquakes and tsunamis, the history of its pre–twentieth century tsunamis is largely unknown west of the rupture zone of the great (magnitude, M 9.2) 1964 earthquake. Stratigraphy in core transects at two boggy lowland sites on Chirikof Island’s southwest coast preserves tsunami deposits dating from the postg
Authors
Alan R. Nelson, Richard W. Briggs, Tina Dura, Simon E. Engelhart, Guy Gelfenbaum, Lee-Ann Bradley, S.L. Forman, Christopher H. Vane, K.A. Kelley
NGA-West 2 GMPE average site coefficients for use in earthquake-resistant design
Site coefficients corresponding to those in tables 11.4–1 and 11.4–2 of Minimum Design Loads for Buildings and Other Structures published by the American Society of Civil Engineers (Standard ASCE/SEI 7-10) are derived from four of the Next Generation Attenuation West2 (NGA-W2) Ground-Motion Prediction Equations (GMPEs). The resulting coefficients are compared with those derived by other researcher
Authors
Roger D. Borcherdt
Chance findings about early holocene tidal marshes of Grays Harbor, Washington, in relation to rapidly rising seas and great subduction earthquakes
Tidal marshes commonly build upward apace with gradual rise in the level of the sea. It is expected, however, that few tidal marshes will keep up with accelerated sea-level rise later in this century. Tidal marshes have been drowned, moreover, after subsiding during earthquakes.
This report tells of ancient marshes that endured rapid sea-level rise in a region that subsides during earthquakes. The
Authors
James B. Phipps, Eileen Hemphill-Haley, Brian F. Atwater