Publications
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Amplification of earthquake ground motions in Washington, DC, and implications for hazard assessments in central and eastern North America
The extent of damage in Washington, DC, from the 2011 Mw 5.8 Mineral, VA, earthquake was surprising for an epicenter 130 km away; U.S. Geological Survey “Did-You-Feel-It” reports suggest that Atlantic Coastal Plain and other unconsolidated sediments amplified ground motions in the city. We measure this amplification relative to bedrock sites using earthquake signals recorded on a temporary seismom
Authors
Thomas L. Pratt, J. Wright Horton, Jessica Munoz, Susan E. Hough, Martin C. Chapman, C. Guney Olgun
Investigation of input reduction techniques for morphodynamic modeling of complex inlets with baroclinic forcing
The Mouth of the Columbia River (MCR) is a complex estuary inlet system characterized by a buoyant plume created
by high freshwater flows from the Columbia River into the Pacific Ocean. Data obtained during two major field
campaigns have resulted in a comprehensive dataset of hydrodynamics and sediment transport under high (2013) and
low (2005) river flow conditions. Through the analysis of this d
Authors
Guy R. Gelfenbaum, Edwin Elias, Andrew W. Stevens
A 600-year-long stratigraphic record of tsunamis in south-central Chile
The stratigraphy within coastal river valleys in south-central Chile clarifies and extends the region’s history of large, earthquakes and accompanying tsunamis. Our site at Quidico (38.1°S, 73.3°W) is located in an overlap zone between ruptures of magnitude 8–9 earthquakes in 1960 and 2010, and, therefore, records tsunamis originating from subduction-zone ruptures north and south of the city of Co
Authors
Isabel Hong, Tina Dura, Lisa L. Ely, Benajamin P. Horton, Alan R. Nelson, Marco Cisternas, Daria Nikitina, Robert L. Wesson
Implications of the earthquake cycle for inferring fault locking on the Cascadia megathrust
GPS velocity fields in the Western US have been interpreted with various physical models of the lithosphere-asthenosphere system: (1) time-independent block models; (2) time-dependent viscoelastic-cycle models, where deformation is driven by viscoelastic relaxation of the lower crust and upper mantle from past faulting events; (3) viscoelastic block models, a time-dependent variation of the block
Authors
Fred Pollitz, Eileen Evans
New techniques to measure cliff change from historical oblique aerial photographs and structure-from-motion photogrammetry
Oblique aerial photograph surveys are commonly used to document coastal landscapes. Here it is shown that adequate overlap may exist in these photographic records to develop topographic models with Structure-from-Motion (SfM) photogrammetric techniques. Using photographs of Fort Funston, California, from the California Coastal Records Project, imagery were combined with ground control points in a
Authors
Jonathan Warrick, Andy Ritchie, Gabrielle Adelman, Ken Adelman, Patrick W. Limber
Geologic setting of the proposed West Flank Forge Site, California: Suitability for EGS research and development
The proposed West Flank FORGE site is within the China Lake Naval Air Weapons Station (NAWS), China Lake, CA. The West Flank is west of the Coso geothermal field, an area of China Lake NAWS dominated by the Quaternary Coso volcanic field largely comprised of rhyolite domes and their volcaniclastic and epiclastic horizons. The largest dome flow complex, Sugarloaf Mountain, marks the northwestern ma
Authors
Andrew Sabin, Kelly Blake, Mike Lazaro, Douglas Blankenship, Mack Kennedy, Jess McCullough, S.B. DeOreo, Stephen H. Hickman, Jonathan M.G. Glen, J. Ole Kaven, Colin F. Williams, Geoffrey Phelps, James E. Faulds, Nicholas H. Hinz, Wendy M. Calvin, Drew Siler, Ann Robertson-Tait
Effects of topographic data quality on estimates of shallow slope stability using different regolith depth models
Thickness of colluvium or regolith overlying bedrock or other consolidated materials is a major factor in determining stability of unconsolidated earth materials on steep slopes. Many efforts to model spatially distributed slope stability, for example to assess susceptibility to shallow landslides, have relied on estimates of constant thickness, constant depth, or simple models of thickness (or de
Authors
Rex L. Baum
Thumbnail‐based questionnaires for the rapid and efficient collection of macroseismic data from global earthquakes
The collection of earthquake testimonies (i.e., qualitative descriptions of felt shaking) is essential for macroseismic studies (i.e., studies gathering information on how strongly an earthquake was felt in different places), and when done rapidly and systematically, improves situational awareness and in turn can contribute to efficient emergency response. In this study, we present advances made i
Authors
Remy Bossu, Matthieu Landes, Frederic Roussel, Robert Steed, Gilles Mazet-Roux, Stacey S. Martin, Susan E. Hough
Reexamination of the magnitudes for the 1906 and 1922 Chilean earthquakes using Japanese tsunami amplitudes: Implications for source depth constraints
Far-field tsunami records from the Japanese tide gauge network allow the reexamination of the moment magnitudes (Mw) for the 1906 and 1922 Chilean earthquakes, which to date rely on limited information mainly from seismological observations alone. Tide gauges along the Japanese coast provide extensive records of tsunamis triggered by six great (Mw >8) Chilean earthquakes with instrumentally determ
Authors
M. Carvajal, M. Cisternas, A. Gubler, P. A. Catalan, P. Winckler, Robert L. Wesson
Extreme geomagnetic storms: Probabilistic forecasts and their uncertainties
Extreme space weather events are low-frequency, high-risk phenomena. Estimating their rates of occurrence, as well as their associated uncertainties, is difficult. In this study, we derive statistical estimates and uncertainties for the occurrence rate of an extreme geomagnetic storm on the scale of the Carrington event (or worse) occurring within the next decade. We model the distribution of even
Authors
Pete Riley, Jeffrey J. Love
The history of late holocene surface-faulting earthquakes on the central segments of the Wasatch fault zone, Utah
The Wasatch fault (WFZ)—Utah’s longest and most active normal fault—forms a prominent eastern boundary to the Basin and Range Province in northern Utah. To provide paleoseismic data for a Wasatch Front regional earthquake forecast, we synthesized paleoseismic data to define the timing and displacements of late Holocene surface-faulting earthquakes on the central five segments of the WFZ. Our analy
Authors
Christopher DuRoss, Stephen Personius, Susan S Olig, Anthony J. Crone, Michael D. Hylland, William R. Lund, David P. Schwartz
Imaging of earthquake faults using small UAVs as a pathfinder for air and space observations
Large earthquakes cause billions of dollars in damage and extensive loss of life and property. Geodetic and topographic imaging provide measurements of transient and long-term crustal deformation needed to monitor fault zones and understand earthquakes. Earthquake-induced strain and rupture characteristics are expressed in topographic features imprinted on the landscapes of fault zones. Small UAVs
Authors
Andrea Donnellan, Joseph Green, Adnan Ansar, Joseph Aletky, Margaret Glasscoe, Yehuda Ben-Zion, J. Ramón Arrowsmith, Stephen B. DeLong