Publications
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3-D joint geodetic and strong-motion finite fault inversion of the 2008 May 12, Wenchuan, China Earthquake
We present a source inversion of the 2008 Wenchuan, China earthquake, using strong-motion waveforms and geodetic offsets together with three-dimensional synthetic ground motions. We applied the linear multiple time window technique considering geodetic and dynamic Green's functions computed with the finite element method and the reciprocity and Strain Green’s Tensor formalism. All ground motion es
Authors
Leonardo Ramirez-Guzman, Stephen H. Hartzell
Real-time performance of the PLUM earthquake early warning method during the 2019 M6.4 and M7.1 Ridgecrest, California, Earthquakes
We evaluate the timeliness and accuracy of ground‐motion‐based earthquake early warning (EEW) during the July 2019 M6.4 and 7.1 Ridgecrest earthquakes. In 2018, we began retrospective and internal real‐time testing of the propagation of local undamped motion (PLUM) method for earthquake warning in California, Oregon, and Washington, with the potential that PLUM might one day be included in the Sha
Authors
Sarah E. Minson, Jessie Kate Saunders, Julian Bunn, Elizabeth S. Cochran, Annemarie S. Baltay, Deborah L. Kilb, Mitsuyuki Hoshiba, Yuki Kodera
Sediment transport in a restored, river-influenced Pacific Northwest estuary
Predicting the success of future investments in coastal and estuarine ecosystem restorations is limited by scarce data quantifying sediment budgets and transport processes of prior restorations. This study provides detailed analyses of the hydrodynamics and sediment fluxes of a recently restored U.S. Pacific Northwest estuary, a 61 ha former agricultural area near the mouth of the Stillaguamish Ri
Authors
Daniel J. Nowacki, Eric E. Grossman
Temporal and spatial variability of shallow soil moisture across four planar hillslopes on a tropical ocean island, San Cristóbal, Galápagos
Study Region: This paper provides a summary of findings from temporal and spatial studies of soil water content on planar hillslopes across the equatorial island of San Cristóbal, Galápagos (Ecuador).
Study Focus: Soil water content (SWC) was measured to generate temporal and spatial records to determine seasonal variation and to investigate how the behavior of surface and near-surface root-zone
Authors
Madelyn S. Percy, Diego A. Riveros-Iregui, Benjamin B. Mirus, Larry K. Benninger
Landslides across the United States: Occurrence, susceptibility, and data limitations
Detailed information about landslide occurrence is the foundation for advancing process understanding, susceptibility mapping, and risk reduction. Despite the recent revolution in digital elevation data and remote sensing technologies, landslide mapping remains resource intensive. Consequently, a modern, comprehensive map of landslide occurrence across the United States (USA) has not been compiled
Authors
Benjamin B. Mirus, Eric S. Jones, Rex L. Baum, Jonathan W. Godt, Stephen L. Slaughter, Matthew Crawford, Jeremy T. Lancaster, Thomas Stanley, Dalia Kirschbaum, William J. Burns, Robert G. Schmitt, Kassandra O Lindsey, Kevin McCoy
Observations of coastal change and numerical modeling of sediment-transport pathways at the mouth of the Columbia River and its adjacent littoral cell
Bathymetric and topographic surveys performed annually along the coastlines of northern Oregon and southwestern Washington documented changes in beach and nearshore morphology between 2014 and 2019. Volume change analysis revealed measurable localized erosion and deposition throughout the study area, but significant net erosion at the regional scale (several kilometers [km]) was limited to Benson
Authors
Andrew W. Stevens, Edwin Elias, Stuart Pearson, George M. Kaminsky, Peter R Ruggiero, Heather M. Weiner, Guy R. Gelfenbaum
When source and path components trade off in ground-motion prediction equations
Current research on ground‐motion models (also known as ground‐motion prediction equations [GMPEs]) and their uncertainties focus on the separate contributions of source, path, and site to both median values and their variability. Implicit here is the assumption that the event term, path term, and site term reflect only properties of the source, path, and site, respectively. Events with larger str
Authors
Annemarie S. Baltay, Lauren S. Abrahams, Thomas C. Hanks
Minimal clustering of injection-induced earthquakes observed with a large-n seismic array
The clustering behavior of injection‐induced earthquakes is examined using one month of data recorded by the LArge‐n Seismic Survey in Oklahoma (LASSO) array. The 1829‐node seismic array was deployed in a 25 km×32 km area of active saltwater disposal in northern Oklahoma between 14 April and 10 May 2016. Injection rates in the study area are nearly constant around the time of the deployment. We
Authors
Elizabeth S. Cochran, A. Wickham-Piotrowski, K. Kemna, R. M Harrington, S. Dougherty, A. Pena Castro
Impacts of sea-level rise on the tidal reach of California coastal rivers using the Coastal Storm Modeling System (CoSMoS)
In coastal rivers, the interactions between tides and fluvial discharge affect local ecology, sedimentation, river dynamics, river mouth configuration, and the flooding potential in adjacent wetlands and low-lying areas. With sea-level rise, the tidal reach within coastal rivers can expand upstream, impacting river dynamics and increasing flood risk across a much greater area. Rivers along the Pac
Authors
Andrea C. O'Neill, Li H. Erikson, Patrick L. Barnard
Peak ground velocity spatial variability revealed by dense seismic array in southern California
Understanding and modeling variability of ground motion is essential for building accurate and precise ground motion prediction equations, which can net site‐specific characterization and reduced hazard levels. Here, we explore the spatial variability in peak ground velocity (PGV) at Sage Brush Flats along the San Jacinto Fault in southern California. We use data from a dense array (0.6 x 0.6 km2,
Authors
Christopher E Johnson, Debi Kilb, Annemarie S. Baltay, Frank Vernon
Hydro-morphological characterization of coral reefs for wave runup prediction
Many coral reef-lined coasts are low-lying with elevations <4 m above mean sea level. Climate-change-driven sea-level rise, coral reef degradation, and changes in storm wave climate will lead to greater occurrence and impacts of wave-driven flooding. This poses a significant threat to their coastal communities. While greatly at risk, the complex hydrodynamics and bathymetry of reef-lined coasts ma
Authors
Fred Scott, Jose A. A. Antolinez, Robert T. McCall, Curt D. Storlazzi, Ad Reiners, Stuart Pearson
Submarine canyons, slope failures and mass transport processes in southern Cascadia
The marine turbidite record along the southern Cascadia Subduction Zone has been used to interpret paleoseismicity and suggest a shorter recurrence interval for large (>M7) earthquakes along this portion of the margin; however, the sources and pathways of these turbidity flows are poorly constrained. We examine the spatial distribution of sediment storage, downslope transport, and slope failures a
Authors
Jenna C. Hill, Janet Watt, Daniel S. Brothers, Jared W. Kluesner