Publications
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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
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
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
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
Development and utilization of USGS ShakeCast for rapid post-earthquake assessment of critical facilities and infrastructure Development and utilization of USGS ShakeCast for rapid post-earthquake assessment of critical facilities and infrastructure
The ShakeCast system is an openly available, near real-time post-earthquake information management system. ShakeCast is widely used by public and private emergency planners and responders, lifeline utility operators and transportation engineers to automatically receive and process ShakeMap products for situational awareness, inspection priority, or damage assessment of their own...
Authors
David J. Wald, Kuo-wan Lin, C. A. Kircher, Kishor S. Jaiswal, Nico Luco, L. Turner, Daniel Slosky
The role of initial coherence and path materials in the dynamics of three rock avalanche case histories The role of initial coherence and path materials in the dynamics of three rock avalanche case histories
Background Rock avalanches are flow-like landslides that can travel at extremely rapid velocities and impact surprisingly large areas. The mechanisms that lead to the unexpected mobility of these flows are unknown and debated. Mechanisms proposed in the literature can be broadly classified into those that rely on intrinsic characteristics of the rock avalanche material, and those that...
Authors
Jordan Aaron, Scott McDougall, Jeffrey R. Moore, Jeffrey A. Coe, Oldrich Hungr
Modeling strong‐motion recordings of the 2010 Mw 8.8 Maule, Chile, earthquake with high stress‐drop subevents and background slip Modeling strong‐motion recordings of the 2010 Mw 8.8 Maule, Chile, earthquake with high stress‐drop subevents and background slip
Strong‐motion recordings of the Mw 8.8 Maule earthquake were modeled using a compound rupture model consisting of (1) a background slip distribution with large correlation lengths, relatively low slip velocity, and long peak rise time of slip of about 10 s and (2) high stress‐drop subevents (asperities) on the deeper portion of the rupture with moment magnitudes 7.9–8.2, high slip...
Authors
Arthur D. Frankel
Dynamic strains for earthquake source characterization Dynamic strains for earthquake source characterization
Strainmeters measure elastodynamic deformation associated with earthquakes over a broad frequency band, with detection characteristics that complement traditional instrumentation, but they are commonly used to study slow transient deformation along active faults and at subduction zones, for example. Here, we analyze dynamic strains at Plate Boundary Observatory (PBO) borehole...
Authors
Andrew J. Barbour, Brendan W. Crowell