Publications
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Seismic reflection imaging of the low-angle Panamint normal fault system, eastern California Seismic reflection imaging of the low-angle Panamint normal fault system, eastern California
Shallowly dipping (
Authors
Ryan D. Gold, William J. Stephenson, Richard W. Briggs, Christopher DuRoss, Eric Kirby, Edward W Woolery, Jaime Delano, Jackson K. Odum
Identifying the greatest earthquakes of the past 2000 years at the Nehalem River Estuary, Northern Oregon Coast, USA Identifying the greatest earthquakes of the past 2000 years at the Nehalem River Estuary, Northern Oregon Coast, USA
We infer a history of three great megathrust earthquakes during the past 2000 years at the Nehalem River estuary based on the lateral extent of sharp (≤3 mm) peat-mud stratigraphic contacts in cores and outcrops, coseismic subsidence as interpreted from fossil diatom assemblages and reconstructed with foraminiferal assemblages using a Bayesian transfer function, and regional correlation...
Authors
Alan R. Nelson, Andrea D. Hawkes, Yuki Sawai, Simon E. Engelhart, Robert C. Witter, Wendy C. Grant-Walter, Lee-Ann Bradley, Tina Dura, Niamh Cahill, Benajamin P. Horton
Extraformational sediment recycling on Mars Extraformational sediment recycling on Mars
Extraformational sediment recycling (old sedimentary rock to new sedimentary rock) is a fundamental aspect of Earth’s geological record; tectonism exposes sedimentary rock, whereupon it is weathered and eroded to form new sediment that later becomes lithified. On Mars, tectonism has been minor, but two decades of orbiter instrument–based studies show that some sedimentary rocks...
Authors
Kenneth S. Edgett, Steven Banham, Kristen A. Bennett, Lauren A. Edgar, Christopher S. Edwards, Alberto Fairen, Christopher M. Fedo, Deirdra M. Fey, James B. Garvin, John P. Grotzinger, Sanjeev Gupta, Marie Henderson, Christopher H House, Nicolas Mangold, Scott McLennan, Horton E. Newsom, Scott Rowland, Kirsten L. Siebach, Lucy Thompson, Scott VanBommel, Roger C. Wiens, Rebecca Williams, Aileen Yingst
VS30 and Dominant Site Frequency (fd) as Provisional Station ML Corrections (dML) in California VS30 and Dominant Site Frequency (fd) as Provisional Station ML Corrections (dML) in California
New seismic stations added to a regional seismic network cannot be used to calculate local magnitude (ML) until a revised regionwide amplitude decay function is developed. Each station must record a minimum number of local and regional earthquakes that meet specific amplitude requirements prior to recalibration of the amplitude decay function. Station component adjustments (dML...
Authors
Alan Yong, Elizabeth S. Cochran, Jennifer Andrews, Kenneth Hudson, Ellen Yu, Antony Martin, Julie A. Herrick, Jessica Dozal
Selecting three components of ground motions from Conditional Spectra for multiple stripe analyses Selecting three components of ground motions from Conditional Spectra for multiple stripe analyses
For complex structures where the seismic response depends appreciably on the vertical (V) component of ground motion (GM) (e.g., base-isolated buildings, long-span bridges, dams, nuclear power plants), incremental dynamic analysis (IDA) is commonly utilized to estimate seismic risk, where the V components of GM are selected and scaled based on the corresponding horizontal (H) components...
Authors
N. Simon Kwong, Kishor S. Jaiswal, Nico Luco, J. W. Baker
Proposed AASHTO guidelines for performance-based seismic bridge design Proposed AASHTO guidelines for performance-based seismic bridge design
No abstract available.
Authors
Thomas P. Murphy, Lee Marsh, Stuart Bennion, Ian G. Buckle, Nico Luco, Donald Anderson, Mervyn Kowalsky, Jose Restrepo
The impacts of a changing climate to DOD coastal facilities in the tropical Pacific Ocean The impacts of a changing climate to DOD coastal facilities in the tropical Pacific Ocean
The USGS, the National Oceanic and Atmospheric Administration (NOAA), Deltares, and the University of Hawaii (UH) recently completed a study investigating the impact of a changing climate and sea-level rise on Roi-Namur Island on Kwajalein Atoll in the Republic of the Marshall Islands, which is part of the Ronald Reagan Ballistic Missile Defense Test Site (RTS). The isolated location of...
Authors
Curt D. Storlazzi
Twelve-year dynamics and rainfall thresholds for alternating creep and rapid movement of the Hooskanaden landslide from integrating InSAR, pixel offset tracking, and borehole and hydrological measurements Twelve-year dynamics and rainfall thresholds for alternating creep and rapid movement of the Hooskanaden landslide from integrating InSAR, pixel offset tracking, and borehole and hydrological measurements
The Hooskanaden landslide is a large (~600 m wide × 1,300 m long), deep (~30 – 45 m) slide located in southwestern Oregon. Since 1958, it has had five moderate/major movements that catastrophically damaged the intersecting U.S. Highway 101, along with persistent slow wet‐season movements and a long‐term accelerating trend due to coastal erosion. Multiple remote sensing approaches...
Authors
Y. Xu, Z. Lu, William H. Schulz, J. Kim
Assessing the long-term earthquake risk for the US National Bridge Inventory (NBI) Assessing the long-term earthquake risk for the US National Bridge Inventory (NBI)
We estimate annualized earthquake loss associated with over 600,000 bridges located throughout the contiguous United States. Each year, the Federal Highway Administration, in partnership with State Departments of Transportation, undertake a massive exercise to update the National Bridge Inventory (NBI) by combining data from states, federal agencies, local jurisdictions, and tribal...
Authors
Kishor S. Jaiswal, N. Simon Kwong, S. S. Yen, D. Bausch, Kuo-wan Lin, Nico Luco, David J. Wald, J. Rozelle
Shallow basin structure and attenuation are key to predicting long shaking duration in Los Angeles Basin Shallow basin structure and attenuation are key to predicting long shaking duration in Los Angeles Basin
Ground motions in the Los Angeles Basin during large earthquakes are modulated by earthquake ruptures, path effects into the basin, basin effects, and local site response. We analyzed the direct effect of shallow basin structures on shaking duration at a period of 2–10 s in the Los Angeles region through modeling small magnitude, shallow, and deep earthquake pairs. The source depth...
Authors
Voon H Lai, Robert Graves, Chunquan Yu, Zhongwen Zhan, Don Helmberger
Nodal seismograph recordings of the 2019 Ridgecrest Earthquake Sequence Nodal seismograph recordings of the 2019 Ridgecrest Earthquake Sequence
The 2019 Ridgecrest, California earthquake sequence included Mw 6.4 and Mw 7.1 earthquakes that occurred on successive days beginning on 4 July 2019. These two largest earthquakes of the sequence occurred on orthogonal faults that ruptured the Earth’s surface. To better evaluate the 3D subsurface fault structure, (P- and S-wave) velocity, 3D and temporal variations in seismicity, and...
Authors
Rufus D. Catchings, Mark Goldman, Jamison Haase Steidl, Joanne Chan, Amir A. Allam, Coyn Criley, Zhenning Ma, Daniel S. Langermann, Garet Jax Huddleston, Andrian T. McEvilly, Daniel David Thomas Mongovin, Yehuda Ben-Zion
Sea‐level rise will drive divergent sediment transport patterns on fore reefs and reef flats, potentially causing erosion on atoll islands Sea‐level rise will drive divergent sediment transport patterns on fore reefs and reef flats, potentially causing erosion on atoll islands
Atoll reef islands primarily consist of unconsolidated sediment, and their ocean‐facing shorelines are maintained by sediment produced and transported across their reefs. Changes in incident waves can alter cross‐shore sediment exchange and, thus, affect the sediment budget and morphology of atoll reef islands. Here we investigate the influence of sea level rise and projected wave...
Authors
James F Bramante, Andrew D Ashton, Curt D. Storlazzi, Olivia M. Cheriton, Jeffrey P. Donnelly