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Person

Benjamin L Melosh

Research Geologist
Email: bmelosh@usgs.gov
Office Phone: 650-439-2361
ORCID: 0000-0002-8017-7193

Location
345 Middlefield Road
Menlo Park , CA 94025
US
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The California Coast Range are an area with a long-lived deformation history which includes modern, ongoing right lateral strike slip faulting. Large strike slip faults in the region include the San Andreas fault, the Maacama fault, the Bartlett Springs fault among many others. In areas where strike slip fault geometry changes, either in restraining or releasing bends, vertical motion may occur in response to dominant right-lateral deformation. Channel steepness and chi data may be used to identify areas of recent uplift where the bedrock hardness and local precipitation gradients are known. This dataset provides a map of channel steepness and chi and was generated with Land Surface Dynamics Topography Tools software...
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This geologic map database is comprised of new geologic mapping, at a 1:24,000 scale, along the southern Bartlett Springs fault in the northern California Coast Ranges. The map covers an area of 258 square miles in Lake, Napa, Colusa, and Yolo counties, work was undertaken between 2016 and 2021, and supported by the USGS National Cooperative Geologic Map Program. This geodatabase contains the most up-to-date and highest resolution mapping in the region. Results and observations reported here help elucidate the geologic deformational history, as well as relationships between active older and active structures. Please consult the map pamphlet and description of map units for a detailed presentation and interpretation...
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This data release contains principal facts of gravity measurements collected by the U.S. Geological Survey in 2020-2022, a compilation of existing and new density and magnetic susceptibility data, and gridded magnetic and magnetic potential data of the Bartlett Springs Fault Zone and surrounding areas, northern California. These data support modeling of gravity and magnetic anomalies to characterize serpentinite bodies along the Bartlett Springs Fault zone as a proxy for fault creep and understand structure along the Coast Range-Sacramento Valley interface.
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