Publications
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Processing and review interface for strong motion data (PRISM) software, version 1.0.0—Methodology and automated processing Processing and review interface for strong motion data (PRISM) software, version 1.0.0—Methodology and automated processing
A continually increasing number of high-quality digital strong-motion records from stations of the National Strong-Motion Project (NSMP) of the U.S. Geological Survey (USGS), as well as data from regional seismic networks within the United States, call for automated processing of strong-motion records with human review limited to selected significant or flagged records. The NSMP has...
Authors
Jeanne Jones, Erol Kalkan, Christopher Stephens
Landslide kinematics and their potential controls from hourly to decadal timescales: Insights from integrating ground-based InSAR measurements with structural maps and long-term monitoring data Landslide kinematics and their potential controls from hourly to decadal timescales: Insights from integrating ground-based InSAR measurements with structural maps and long-term monitoring data
Knowledge of kinematics is rudimentary for understanding landslide controls and is increasingly valuable with greater spatiotemporal coverage. However, characterizing landslide-wide kinematics is rare, especially at broadly ranging timescales. We used highly detailed kinematic data obtained using photogrammetry and field mapping during the 1980s and 1990s and our 4.3-day ground-based...
Authors
William H. Schulz, Jeffrey A. Coe, P.P Ricci, Gregory M. Smoczyk, Brett L Shurtleff, J Panosky
Tsunamis: Bayesian probabilistic hazard analysis Tsunamis: Bayesian probabilistic hazard analysis
No abstract available.
Authors
Anita Grezio, Stefano Lorito, Tom Parsons, Jacopo Selva
Gravitational body forces focus North American intraplate earthquakes Gravitational body forces focus North American intraplate earthquakes
Earthquakes far from tectonic plate boundaries generally exploit ancient faults, but not all intraplate faults are equally active. The North American Great Plains exemplify such intraplate earthquake localization, with both natural and induced seismicity generally clustered in discrete zones. Here we use seismic velocity, gravity and topography to generate a 3D lithospheric density model...
Authors
William Brower Levandowski, Mark Zellman, Richard W. Briggs
Lithospheric density structure beneath the Tarim basin and surroundings, northwestern China, from the joint inversion of gravity and topography Lithospheric density structure beneath the Tarim basin and surroundings, northwestern China, from the joint inversion of gravity and topography
Intraplate strain generally focuses in discrete zones, but despite the profound impact of this partitioning on global tectonics, geodynamics, and seismic hazard, the processes by which deformation becomes localized are not well understood. Such heterogeneous intraplate strain is exemplified in central Asia, where the Indo-Eurasian collision has caused widespread deformation while the...
Authors
Yangfan Deng, William Brower Levandowski, Tim Kusky
Source modeling of the 2015 Mw 7.8 Nepal (Gorkha) earthquake sequence: Implications for geodynamics and earthquake hazards Source modeling of the 2015 Mw 7.8 Nepal (Gorkha) earthquake sequence: Implications for geodynamics and earthquake hazards
The Gorkha earthquake on April 25th, 2015 was a long anticipated, low-angle thrust-faulting event on the shallow décollement between the India and Eurasia plates. We present a detailed multiple-event hypocenter relocation analysis of the Mw 7.8 Gorkha Nepal earthquake sequence, constrained by local seismic stations, and a geodetic rupture model based on InSAR and GPS data. We integrate...
Authors
Daniel E. McNamara, William L. Yeck, William D. Barnhart, V. Schulte-Pelkum, E. Bergman, L. B. Adhikari, Amod Dixit, S. E. Hough, Harley M. Benz, Paul S. Earle
Chemistry of diagenetic features analyzed by ChemCam at Pahrump Hills, Gale crater, Mars Chemistry of diagenetic features analyzed by ChemCam at Pahrump Hills, Gale crater, Mars
The Curiosity rover's campaign at Pahrump Hills provides the first analyses of lower Mount Sharp strata. Here we report ChemCam elemental composition of a diverse assemblage of post-depositional features embedded in, or cross-cutting, the host rock. ChemCam results demonstrate their compositional diversity, especially compared to the surrounding host rock: (i) Dendritic aggregates and...
Authors
Marion Nachon, Nicolas Mangold, Olivier Forni, Linda C. Kah, Agnes Cousin, Roger C. Wiens, Ryan B. Anderson, Diana L. Blaney, Jen G. Blank, Fred J. Calef, Samuel M. Clegg, Cecile Fabre, Martin R. Fisk, Olivier Gasnault, John P. Grotzinger, Rachel Kronyak, Nina L. Lanza, Jeremie Lasue, Laetitia Le Deit, Stephane Le Mouelic, Sylvestre Maurice, Pierre-Yves Meslin, D. Z. Oehler, Valerie Payre, William Rapin, Susanne Schroder, Katherine M. Stack, Dawn Sumner
Improved accuracy in quantitative laser-induced breakdown spectroscopy using sub-models Improved accuracy in quantitative laser-induced breakdown spectroscopy using sub-models
Accurate quantitative analysis of diverse geologic materials is one of the primary challenges faced by the Laser-Induced Breakdown Spectroscopy (LIBS)-based ChemCam instrument on the Mars Science Laboratory (MSL) rover. The SuperCam instrument on the Mars 2020 rover, as well as other LIBS instruments developed for geochemical analysis on Earth or other planets, will face the same...
Authors
Ryan B. Anderson, Samuel M. Clegg, Jens Frydenvang, Roger C. Wiens, Scott M. McLennan, Richard V. Morris, Bethany L. Ehlmann, M. Darby Dyar
Electrical resistivity investigation of fluvial geomorphology to evaluate potential seepage conduits to agricultural lands along the San Joaquin River, Merced County, California, 2012–13 Electrical resistivity investigation of fluvial geomorphology to evaluate potential seepage conduits to agricultural lands along the San Joaquin River, Merced County, California, 2012–13
Increased flows in the San Joaquin River, part of the San Joaquin River Restoration Program, are designed to help restore fish populations. However, increased seepage losses could result from these higher restoration flows, which could exacerbate existing drainage problems in neighboring agricultural lands and potentially damage crops. Channel deposits of abandoned river meanders that...
Authors
Krishangi D. Groover, Matthew K. Burgess, James F. Howle, Steven P. Phillips
Relations between some horizontal‐component ground‐motion intensity measures used in practice Relations between some horizontal‐component ground‐motion intensity measures used in practice
Various measures using the two horizontal components of recorded ground motions have been used in a number of studies that derive ground‐motion prediction equations and construct maps of shaking intensity. We update relations between a number of these measures, including those in Boore et al. (2006) and Boore (2010), using the large and carefully constructed global database of ground...
Authors
David Boore, Tadahiro Kishida
Ground motion in the presence of complex Topography II: Earthquake sources and 3D simulations Ground motion in the presence of complex Topography II: Earthquake sources and 3D simulations
Eight seismic stations were placed in a linear array with a topographic relief of 222 m over Mission Peak in the east San Francisco Bay region for a period of one year to study topographic effects. Seventy‐two well‐recorded local earthquakes are used to calculate spectral amplitude ratios relative to a reference site. A well‐defined fundamental resonance peak is observed with individual...
Authors
Stephen H. Hartzell, Leonardo Ramirez-Guzman, Mark Meremonte, Alena L. Leeds
Paleoseismic potential of sublacustrine landslide records in a high-seismicity setting (south-central Alaska) Paleoseismic potential of sublacustrine landslide records in a high-seismicity setting (south-central Alaska)
Sublacustrine landslide stratigraphy is considered useful for quantitative paleoseismology in low-seismicity settings. However, as the recharging of underwater slopes with sediments is one of the factors that governs the recurrence of slope failures, it is not clear if landslide deposits can provide continuous paleoseismic records in settings of frequent strong shaking. To test this, we...
Authors
Nore Praet, Jasper Moernaut, Maarten Van Daele, Evelien Boes, Peter J. Haeussler, Michael Strupler, Sabine Schmidt, Michael G. Loso, Marc De Batist