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Scott E.K. Bennett, Ph.D.

Scott is a Research Geologist with the U.S. Geological Survey. He works for the Pacific Northwest Geologic Mapping and Urban Hazards Project and the Lower Colorado River System Project in the GMEG Science Center. His research is focused on geologic mapping, structural geology, neotectonics, and geomorphology of these and other regions of western North America.

Scott Bennett is a Research geologist who combines geologic mapping, structural geology, basin analysis, and geochronology to investigate the timing and rates of crustal deformation. His interdisciplinary and collaborative research focuses on quantifying surface and crustal processes that yield insight into lithospheric-scale plate tectonic systems.

Scott studies the deformation and evolving landscape of continents, collecting data that allows him to reconstruct tectonic movements over a large range of temporal and spatial scales, from earthquakes to orogenies and from faults to plate boundaries.  Scott has experience conducting research in the Cascadia subduction zone of the Pacific Northwest (USA and Canada), on both margins of the Gulf of California oblique rift, along the San Andreas fault system, within the Walker Lane, and across the Basin and Range including the Rio Grande Rift.

Professional Experience

  • Research Geologist -- Tectonics and Geologic Mapping -- USGS Menlo Park, CA; 2017-present

  • Research Geologist -- Tectonics, Paleoseismology, and Geologic Mapping -- USGS Seattle, WA; 2015-2017

  • Mendenhall Post-doc -- Paleoseismology and Earthquake Hazards -- USGS Golden, CO; 2013-2015

  • Graduate Student Researcher -- Tectonics, Neotectonics, and Geologic Mapping

Education and Certifications

  • Ph.D., Geology, University of California, Davis; 2013

  • M.S., Geological Sciences, University of North Carolina – Chapel Hill; 2009

  • B.S., Geological Sciences, California State University, Northridge; 2004

  • Minor in Geography, California State University, Northridge; 2004

Science and Products

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View to the northeast from central Alpine, Utah of the northern Provo segment of the Wasatch fault zone.

New Methods for Dating and Sequencing Ancient Earthquakes Along the Wasatch Fault Zone

Release Date: OCTOBER 12, 2018Complex geologic sites, like those between the fault segments along the Wasatch fault zone in Utah, make the dating and ordering past earthquakes a difficult task. Two new methods were used to make this task easier and to get better results.
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Natural Hazards, Earthquake Hazards
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New Methods for Dating and Sequencing Ancient Earthquakes Along the Wasatch Fault Zone

Release Date: OCTOBER 12, 2018Complex geologic sites, like those between the fault segments along the Wasatch fault zone in Utah, make the dating and ordering past earthquakes a difficult task. Two new methods were used to make this task easier and to get better results.
Learn More
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The Wasatch fault is located in central Utah and southeast Idaho, along the eastern edge of the Basin and Range Province.

How Big and How Frequent Are Earthquakes on the Wasatch Fault?

Release Date: FEBRUARY 1, 2015Paleoseismology along the Wasatch Fault in Utah is helping to estimate the shaking risk to nearby towns.
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Natural Hazards, Earthquake Hazards
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How Big and How Frequent Are Earthquakes on the Wasatch Fault?

Release Date: FEBRUARY 1, 2015Paleoseismology along the Wasatch Fault in Utah is helping to estimate the shaking risk to nearby towns.
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Physiographic image of the Pacific Northwest

Pacific Northwest Geologic Mapping: Northern Pacific Border, Cascades and Columbia

The Pacific Northwest is an area created by active and complex geological processes. On its path to the Pacific Ocean, the Columbia River slices through a chain of active volcanoes located along the western margin of the U.S. in Washington, Oregon, and northern California. These volcanoes rest above the active Cascadia subduction zone, which is the boundary where the oceanic tectonic plate dives...
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National Cooperative Geologic Mapping Program, Earthquake Science Center, Geology, Minerals, Energy, and Geophysics Science Center, Oregon Water Science Center, Washington Water Science Center, Western Fisheries Research Center
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Pacific Northwest Geologic Mapping: Northern Pacific Border, Cascades and Columbia

The Pacific Northwest is an area created by active and complex geological processes. On its path to the Pacific Ocean, the Columbia River slices through a chain of active volcanoes located along the western margin of the U.S. in Washington, Oregon, and northern California. These volcanoes rest above the active Cascadia subduction zone, which is the boundary where the oceanic tectonic plate dives...
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Filter Total Items: 22

Influence of the Eastern California Shear Zone on deposition of the Mio-Pliocene Bouse Formation: Insights from the Cibola area, Arizona

The Eastern California Shear Zone (ECSZ) is a wide zone of late Cenozoic strike-slip faults and related diffuse deformation that currently accommodates ~20–25% of relative Pacific–North America plate motion in the lower Colorado River region (Fig. 1A; Dokka and Travis, 1990; Miller et al., 2001; Guest et al., 2007; Mahan et al., 2009). The ECSZ is kinematically linked southward to dextral faults i
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Energy and Minerals, Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geology, Minerals, Energy, and Geophysics Science Center

Animated tectonic reconstruction of the Lower Colorado River region: Implications for Late Miocene to Present deformation

Although the majority of late Miocene to present Pacific-North America plate boundary strain has been accommodated by faults of the San Andreas and Gulf of California systems, growing evidence of dextral shear east of the San Andreas Fault indicates that a component of plate boundary deformation occurred in the lower Colorado River (LoCR) region. Large-scale tectonic reconstructions across the Gul
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Natural Hazards, Earthquake Hazards, Earthquake Science Center

Assessing the geologic and climatic forcing of biodiversity and evolution surrounding the Gulf of California

For almost a century the Baja California peninsula (Peninsula), Gulf of California (Gulf), and broader Sonoran Desert region (figure 1) have drawn geologists and biologists alike to study its unique physical and evolutionary processes (e.g., Wittich 1920; Darton 1921; Nelson 1921; Johnston 1924; Beal 1948; Durham and Allison 1960). The challenge remains to untangle the long, intricate, and at time
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Natural Hazards, Earthquake Hazards, Geologic Hazards Science Center

Stratigraphy and structural development of the southwest Isla Tiburón marine basin: Implications for latest Miocene tectonic opening and flooding of the northern Gulf of California

Accurate information on the timing of earliest marine incursion into the Gulf of California (northwestern México) is critical for paleogeographic models and for understanding the spatial and temporal evolution of strain accommodation across the obliquely divergent Pacific-North America plate boundary. Marine strata exposed on southwest Isla Tiburón (SWIT) have been cited as evidence for a middle M
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Natural Hazards, Earthquake Hazards, Geologic Hazards Science Center

High‐resolution trench photomosaics from image‐based modeling: Workflow and error analysis

Photomosaics are commonly used to construct maps of paleoseismic trench exposures, but the conventional process of manually using image‐editing software is time consuming and produces undesirable artifacts and distortions. Herein, we document and evaluate the application of image‐based modeling (IBM) for creating photomosaics and 3D models of paleoseismic trench exposures, illustrated with a case‐
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Natural Hazards, Earthquake Hazards, Geologic Hazards Science Center

Slip history of the La Cruz fault: Development of a late Miocene transformin response to increased rift obliquity in the northern Gulf of California

The Gulf of California rift has accommodated oblique divergence of the Pacific and North America plates in north-western México since Miocene time. Due to its infancy, its rifted margins preserve a rare onshore record of early continental break-up processes and an opportunity to investigate the role of rift obliquity in strain localization. We map rift-related structures and syn-tectonic basins on
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Natural Hazards, Earthquake Hazards, Earthquake Science Center

Breaching of strike-slip faults and successive flooding of pull-apart basins to form the Gulf of California seaway from ca. 8–6 Ma

The geologic record of the formation of marine basins during continental rifting is uncommonly preserved. Using GIS-based paleotectonic maps, we show that marine basin formation in the Gulf of California–Salton trough oblique rift (Mexico and the United States) occurred in a stepwise manner as crustal thinning lowered elevations within the Gulf of California Shear Zone, and subsidence along strike
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Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geology, Minerals, Energy, and Geophysics Science Center

Paleoseismic results from the Alpine site, Wasatch fault zone: Timing and displacement data for six holocene earthquakes at the Salt Lake City–Provo segment boundary

To improve the characterization of Holocene earthquakes on the Wasatch fault zone (WFZ), we conducted light detection and ranging (lidar)‐based neotectonic mapping and excavated a paleoseismic trench across an 8‐m‐high fault scarp near Alpine, Utah, located ∼6.2–0.4  ka∼6.2–0.4  ka. Interseismic recurrence ranges from 0.2 to 1.8 ky (mean 1.2 ky). We estimate 6.5±0.7  m6.5±0.7  m of cumulative vert
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Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geology, Minerals, Energy, and Geophysics Science Center

Holocene surface rupture history of an active forearc fault redefines seismic hazard in Southwestern British Columbia, Canada

Characterizing the hazard associated with Quaternary‐active faults in the forearc crust of the northern Cascadia subduction zone has proven challenging due to historically low rates of seismicity, late Quaternary glacial scouring, and dense vegetation that often obscures fault‐related geomorphic features. We couple lidar topography with paleoseismic trenching across the Leech River Fault on southe
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Natural Hazards, Geology, Minerals, Energy, and Geophysics Science Center

A microbial arsenic cycle in sediments of an acidic mine impoundment: Herman Pit, Clear Lake, California

The involvement of prokaryotes in the redox reactions of arsenic occurring between its +5 [arsenate; As(V)] and +3 [arsenite; As(III)] oxidation states has been well established. Most research to date has focused upon circum-neutral pH environments (e.g., freshwater or estuarine sediments) or arsenic-rich “extreme” environments like hot springs and soda lakes. In contrast, relatively little work h
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Water Resources

Neotectonic and paleoseismic analysis of the northwest extent of Holocene surface deformation along the Meers Fault, Oklahoma

TheMeers fault (Oklahoma) is one of fewseismogenic structures with evidence for Holocene surface rupture in the stable continental region of North America. The 37-kilometer-long southeast section of the full 54-kilometer-long Meers fault is interpreted to be Holocene active. The 17-kilometer-long northwest section is considered Quaternary active, but not Holocene active.We reevaluate surface expre
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Geology, Minerals, Energy, and Geophysics Science Center

Mesozoic to Cenozoic sedimentation, tectonics, and metallogeny of Sonora, Mexico

We will embark on a five-day journey through northern, western, and central Sonora, in which we will see excellent examples of mostly Mesozoic to Cenozoic tectonics, sedimentation, and metallogeny. On Day 1, we will visit the porphyry copper deposit at Ajo, Arizona, and several Pleistocene cinder cones and maar craters in the Pinacate Biosphere Reserve. On Day 2, we will see L- and L-S tectonites
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Geology, Minerals, Energy, and Geophysics Science Center

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