Peter Dartnell
Physical Scientist at the USGS Pacific Coastal and Marine Science Center
Science and Products
California State Waters Map Series — Offshore of Half Moon Bay, California
The destructive 1946 Unimak near-field tsunami: New evidence for a submarine slide source from reprocessed marine geophysical data
Bathymetry and acoustic backscatter: outer mainland shelf and slope, Gulf of Santa Catalina, southern California
Greenhouse gases generated from the anaerobic biodegradation of natural offshore asphalt seepages in southern California
Offset of latest pleistocene shoreface reveals slip rate on the Hosgri strike-slip fault, offshore central California
Bathymetry and acoustic backscatter: Estero Bay, California
Sediment transport patterns in the San Francisco Bay Coastal System from cross-validation of bedform asymmetry and modeled residual flux
Hyperpycnal plume-derived fans in the Santa Barbara Channel, California
Seafloor geology and benthic habitats, San Pedro Shelf, southern California
Seafloor samples, videography, still photography, and real-time descriptions of geologic and biologic constituents at or near the seafloor of the San Pedro Shelf, southern California, advance the study of natural and man-made processes on this coastal area off the metropolitan Los Angeles area. Multibeam echo-sounder data collected by the U.S. Geological Survey in 1998 and 1999 guided sampling and
Bathymetry and acoustic backscatter-outer mainland shelf, eastern Santa Barbara Channel, California
Floor of Lake Tahoe, California and Nevada
Introduction to surficial seafloor mapping and characterization
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California State Waters Map Series — Offshore of Half Moon Bay, California
In 2007, the California Ocean Protection Council initiated the California Seafloor Mapping Program (CSMP), designed to create a comprehensive seafloor map of high-resolution bathymetry, marine benthic habitats, and geology within the 3-nautical-mile limit of California’s State Waters. The CSMP approach is to create highly detailed seafloor maps through collection, integration, interpretation, andAuthorsGuy R. Cochrane, Peter Dartnell, H. Gary Greene, Samuel Y. Johnson, Nadine E. Golden, Stephen R. Hartwell, Bryan E. Dieter, Michael W. Manson, Ray W. Sliter, Stephanie L. Ross, Janet Watt, Charles A. Endris, Rikk G. Kvitek, Eleyne L. Phillips, Mercedes D. Erdey, John L. Chin, Carrie K. BretzThe destructive 1946 Unimak near-field tsunami: New evidence for a submarine slide source from reprocessed marine geophysical data
The Mw 8.6 earthquake in 1946 off the Pacific shore of Unimak Island at the end of the Alaska Peninsula generated a far-field tsunami that crossed the Pacific to Antarctica. Its tsunami magnitude, 9.3, is comparable to the 9.1 magnitude of the 2011 Tohoku tsunami. On Unimak Island's Pacific shore, a runup of 42 m destroyed the lighthouse at Scotch Cap. Elsewhere, localized tsunamis with such highAuthorsRoland E. von Huene, Stephen Kirby, John J. Miller, Peter DartnellBathymetry and acoustic backscatter: outer mainland shelf and slope, Gulf of Santa Catalina, southern California
In 2010 and 2011, scientists from the U.S. Geological Survey (USGS), Coastal and Marine Geology Program, acquired bathymetry and acoustic-backscatter data from the outer shelf and slope region offshore of southern California. The surveys were conducted as part of the USGS Marine Geohazards Program. Assessment of the hazards posed by offshore faults, submarine landslides, and tsunamis are facilitatAuthorsPeter Dartnell, James E. Conrad, Holly F. Ryan, David P. FinlaysonGreenhouse gases generated from the anaerobic biodegradation of natural offshore asphalt seepages in southern California
Significant offshore asphaltic deposits with active seepage occur in the Santa Barbara Channel offshore southern California. The composition and isotopic signatures of gases sampled from the oil and gas seeps reveal that the coexisting oil in the shallow subsurface is anaerobically biodegraded, generating CO2 with secondary CH4 production. Biomineralization can result in the consumption of as muchAuthorsT.D. Lorenson, Florence L. Wong, Peter Dartnell, Ray W. SliterOffset of latest pleistocene shoreface reveals slip rate on the Hosgri strike-slip fault, offshore central California
The Hosgri fault is the southern part of the regional Hosgri–San Gregorio dextral strike‐slip fault system, which extends primarily in the offshore for about 400 km in central California. Between Morro Bay and San Simeon, high‐resolution multibeam bathymetry reveals that the eastern strand of the Hosgri fault is crossed by an ∼265 m wide slope interpreted as the shoreface of a latest PleistoceneAuthorsSamuel Y. Johnson, Stephen R. Hartwell, Peter DartnellBathymetry and acoustic backscatter: Estero Bay, California
Between July 30 and August 9, 2012, scientists from the U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center (PCMSC), acquired bathymetry and acoustic-backscatter data from Estero Bay, San Luis Obispo, California, under PCMSC Field Activity ID S-05-12-SC. The survey was done using the R/V Parke Snavely outfitted with a multibeam sonar for swath mapping and highly accurate posiAuthorsStephen R. Hartwell, David P. Finlayson, Peter Dartnell, Samuel Y. JohnsonSediment transport patterns in the San Francisco Bay Coastal System from cross-validation of bedform asymmetry and modeled residual flux
The morphology of ~ 45,000 bedforms from 13 multibeam bathymetry surveys was used as a proxy for identifying net bedload sediment transport directions and pathways throughout the San Francisco Bay estuary and adjacent outer coast. The spatially-averaged shape asymmetry of the bedforms reveals distinct pathways of ebb and flood transport. Additionally, the region-wide, ebb-oriented asymmetry of 5%AuthorsPatrick L. Barnard, Li H. Erikson, Edwin P.L. Elias, Peter DartnellHyperpycnal plume-derived fans in the Santa Barbara Channel, California
Hyperpycnal gravity currents rapidly transport sediment across shore from rivers to the continental shelf and deep sea. Although these geophysical processes are important sediment dispersal mechanisms, few distinct geomorphic features on the continental shelf can be attributed to hyperpycnal flows. Here we provide evidence of large depositional features derived from hyperpycnal plumes on the contiAuthorsJonathan A. Warrick, Alexander R. Simms, Andy Ritchie, Elisabeth Steel, Pete Dartnell, James E. Conrad, David P. FinlaysonSeafloor geology and benthic habitats, San Pedro Shelf, southern California
Seafloor samples, videography, still photography, and real-time descriptions of geologic and biologic constituents at or near the seafloor of the San Pedro Shelf, southern California, advance the study of natural and man-made processes on this coastal area off the metropolitan Los Angeles area. Multibeam echo-sounder data collected by the U.S. Geological Survey in 1998 and 1999 guided sampling and
AuthorsFlorence L. Wong, Peter Dartnell, Brian D. Edwards, Eleyne L. PhillipsBathymetry and acoustic backscatter-outer mainland shelf, eastern Santa Barbara Channel, California
In 2010 and 2011, scientists from the U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center (PCMSC), acquired bathymetry and acoustic-backscatter data from the outer shelf region of the eastern Santa Barbara Channel, California. These surveys were conducted in cooperation with the Bureau of Ocean Energy Management (BOEM). BOEM is interested in maps of hard-bottom substrates, parAuthorsPeter Dartnell, David P. Finlayson, Andrew C. Ritchie, Guy R. Cochrane, Mercedes D. ErdeyFloor of Lake Tahoe, California and Nevada
Lake-floor depths shown by color, from light tan (shallowest) to blue (deepest). Arrows on map (C) show orientations of perspective views. A, view toward McKinney Bay over blocks tumbled onto the lake floor by a massive landslide 10s to 100s of thousands of years ago; dark triangular block near center is approximately 1.5 km (0.9 mi) across and 120 m (390 ft) high. B, view toward South Lake TahoeAuthorsPeter Dartnell, Helen GibbonsIntroduction to surficial seafloor mapping and characterization
No abstract available.AuthorsPeter Dartnell