Publications
Filter Total Items: 7241
Compaction and gas loss in welded pyroclastic deposits as revealed by porosity, permeability, and electrical conductivity measurements of the Shevlin Park Tuff
Pyroclastic flows produced by large volcanic eruptions commonly densify after emplacement. Processes of gas escape, compaction, and welding in pyroclastic-flow deposits are controlled by the physical and thermal properties of constituent material. Through measurements of matrix porosity, permeability, and electrical conductivity, we provide a framework for understanding the evolution of pore struc
Authors
Heather M. Wright, Katharine V. Cashman
The Mw 5.8 Mineral, Virginia, earthquake of August 2011 and aftershock sequence: constraints on earthquake source parameters and fault geometry
The Mw 5.8 earthquake of 23 August 2011 (17:51:04 UTC) (moment, M0 5.7×1017 N·m) occurred near Mineral, Virginia, within the central Virginia seismic zone and was felt by more people than any other earthquake in United States history. The U.S. Geological Survey (USGS) received 148,638 felt reports from 31 states and 4 Canadian provinces. The USGS PAGER system estimates as many as 120,000 people w
Authors
Daniel E. McNamara, H. M. Benz, Robert B. Herrmann, Eric A. Bergman, Paul Earle, Anne Meltzer, Mitch Withers, Martin Chapman
HiRISE observations of new impact craters exposing Martian ground ice
Twenty small new impact craters or clusters have been observed to excavate bright material inferred to be ice at mid and high latitudes on Mars. In the northern hemisphere, the craters are widely distributed geographically and occur at latitudes as low as 39°N. Stability modeling suggests that this ice distribution requires a long-term average atmospheric water vapor content around 25 precipitable
Authors
Colin M. Dundas, Shane Byrne, Alfred S. McEwen, Michael T. Mellon, Megan R. Kennedy, Ingrid J. Daubar, Lee Saper
A scenario study of seismically induced landsliding in Seattle using broadband synthetic seismograms
We demonstrate the value of utilizing broadband synthetic seismograms to assess regional seismically induced landslide hazard. Focusing on a case study of an Mw 7.0 Seattle fault earthquake in Seattle, Washington, we computed broadband synthetic seismograms that account for rupture directivity and 3D basin amplification. We then adjusted the computed motions on a fine grid for 1D amplifications ba
Authors
Kate E. Allstadt, John E. Vidale, Arthur D. Frankel
Modeling earthquake rate changes in Oklahoma and Arkansas: possible signatures of induced seismicity
The rate of ML≥3 earthquakes in the central and eastern United States increased beginning in 2009, particularly in Oklahoma and central Arkansas, where fluid injection has occurred. We find evidence that suggests these rate increases are man‐made by examining the rate changes in a catalog of ML≥3 earthquakes in Oklahoma, which had a low background seismicity rate before 2009, as well as rate chang
Authors
Andrea L. Llenos, Andrew J. Michael
The attenuation of Fourier amplitudes for rock sites in eastern North America
We develop an empirical model of the decay of Fourier amplitudes for earthquakes of M 3–6 recorded on rock sites in eastern North America and discuss its implications for source parameters. Attenuation at distances from 10 to 500 km may be adequately described using a bilinear model with a geometric spreading of 1/R1.3 to a transition distance of 50 km, with a geometric spreading of 1/R0.5 at grea
Authors
Gail M. Atkinson, David M. Boore
Extreme ground motions and Yucca Mountain
Yucca Mountain is the designated site of the underground repository for the United States' high-level radioactive waste (HLW), consisting of commercial and military spent nuclear fuel, HLW derived from reprocessing of uranium and plutonium, surplus plutonium, and other nuclear-weapons materials. Yucca Mountain straddles the western boundary of the Nevada Test Site, where the United States has test
Authors
Thomas C. Hanks, Norman A. Abrahamson, Jack W. Baker, David M. Boore, Mark Board, James N. Brune, C. Allin Cornell, John W. Whitney
Mechanical properties of simulated Mars materials: gypsum-rich sandstones and lapilli tuff
Observations by the Mars Exploration Rover (MER) Opportunity, and other recent studies on diagenesis in the extensive equatorial layered deposits on Mars, suggest that the likely lithologies of these deposits are gypsum-rich sandstones and tuffaceous sediments (for example, Murchie and others, 2009; Squyres and others, 2012; Zimbelman and Scheidt, 2012). Of particular interest is how the diagenesi
Authors
Carolyn Morrow, David Lockner, Chris Okubo
Borehole-explosion and air-gun data acquired in the 2011 Salton Seismic Imaging Project (SSIP), southern California: description of the survey
The Imperial and Coachella Valleys are being formed by active plate-tectonic processes. From the Imperial Valley southward into the Gulf of California, plate motions are rifting the continent apart. In the Coachella Valley, the plates are sliding past one another along the San Andreas and related faults (fig. 1). These processes build the stunning landscapes of the region, but also produce damagin
Authors
Elizabeth J. Rose, Gary S. Fuis, Joann M. Stock, John A. Hole, Annie M. Kell, Graham Kent, Neal W. Driscoll, Mark Goldman, Angela M. Reusch, Liang Han, Robert R. Sickler, Rufus D. Catchings, Michael J. Rymer, Coyn J. Criley, Daniel S. Scheirer, Steven M. Skinner, Coye J. Slayday-Criley, Janice M. Murphy, Edward G. Jensen, Robert McClearn, Alex J. Ferguson, Lesley A. Butcher, Max A. Gardner, Iain D. Emmons, Caleb L. Loughran, Joseph R. Svitek, Patrick C. Bastien, Joseph A. Cotton, David S. Croker, Alistair J. Harding, Jeffrey M. Babcock, Steven H. Harder, Carla M. Rosa
Post-fire debris-flow hazard assessment of the area burned by the 2013 Beaver Creek Fire near Hailey, central Idaho
A preliminary hazard assessment was developed for debris-flow hazards in the 465 square-kilometer (115,000 acres) area burned by the 2013 Beaver Creek fire near Hailey in central Idaho. The burn area covers all or part of six watersheds and selected basins draining to the Big Wood River and is at risk of substantial post-fire erosion, such as that caused by debris flows. Empirical models derived f
Authors
Kenneth D. Skinner
Rupture model of the 2011 Mineral, Virginia, earthquake from teleseismic and regional waveforms
We independently invert teleseismic P waveforms and regional crustal phases to examine the finite fault slip model for the 2011 Mw 5.8 Mineral, Virginia, earthquake. Theoretical and empirical Green's functions are used for the teleseismic and regional models, respectively. Both solutions show two distinct sources each about 2 km across and separated by 2.5 km. The source at the hypocenter is more
Authors
Stephen H. Hartzell, Carlos Mendoza, Yuehua Zeng
Uniform California earthquake rupture forecast, version 3 (UCERF3): the time-independent model
In this report we present the time-independent component of the Uniform California Earthquake Rupture Forecast, Version 3 (UCERF3), which provides authoritative estimates of the magnitude, location, and time-averaged frequency of potentially damaging earthquakes in California. The primary achievements have been to relax fault segmentation assumptions and to include multifault ruptures, both limita
Authors
Edward H. Field, Glenn P. Biasi, Peter Bird, Timothy E. Dawson, Karen R. Felzer, David D. Jackson, Kaj M. Johnson, Thomas H. Jordan, Christopher Madden, Andrew J. Michael, Kevin R. Milner, Morgan T. Page, Thomas Parsons, Peter M. Powers, Bruce E. Shaw, Wayne R. Thatcher, Ray J. Weldon, Yuehua Zeng