James Conrad
I study seafloor geology along the West Coast of the U.S. using various types of geophysical surveys to map the seafloor and image sub-seafloor strata. The purpose of this work is to help understand the hazards posed to coastal communities and infrastructure by offshore active faults and submarine landslides.
I received a Bachelors Degree in Earth Science from U.C. Berkeley in 1981, and a Masters Degree in Geology from San Jose State University in 1993. I have worked at the USGS since 1981, first in the Minerals Program, where I worked to assess the potential for undiscovered mineral deposits in the western U.S., and used Argon geochronology to date mineral deposits and related igneous rocks. In 1995, I joined the Pacific Coastal and Marine Science Center, where I study marine geologic hazards such as earthquakes on offshore faults and tsunamis generated by submarine landslides.
Science and Products
Polyphase Neoproterozoic orogenesis within the east Africa- Antarctica orogenic belt in central and northern Madagascar
Late Pleistocene to Holocene sedimentation and hydrocarbon seeps on the continental shelf of a steep, tectonically active margin, southern California, USA
Comments on potential geologic and seismic hazards affecting proposed liquefied natural gas site in Santa Monica Bay, California
High-resolution chirp and mini-sparker seismic-reflection data from the southern California continental shelf — Gaviota to Mugu Canyon
Benthic habitat and geologic mapping of the outer continental shelf of north-central California
Nearshore benthic habitat GIS for the Channel Islands National Marine Sanctuary and Southern California State Fisheries Reserves, volume II
Style and age of late Oligocene-early Miocene deformation in the southern Stillwater Range, west central Nevada: Paleomagnetism, geochronology, and field relations
Correlation and description of map units for the geologic map of the northern part of the Simpson Park Mountains (Rocky Hills and western part of the Pete Hanson Creek quadrangles), Eureka County, Nevada
40Ar/39Ar dating of vein amphibole from the Bayan Obo iron-rare earth element-niobium deposit, Inner Mongolia, China; constraints on mineralization and deposition of the Bayan Obo Group
Age of tephra beds at the Ocean Point dinosaur locality, North Slope, Alaska, based on K-Ar and 40Ar/39Ar analyses
Mineral resources of the El Dorado and Ireteba Peaks Wilderness Study Areas, Clark County, Nevada
Mineral resources of the Diablo Mountain Wilderness Study Area, Lake County, Oregon
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Polyphase Neoproterozoic orogenesis within the east Africa- Antarctica orogenic belt in central and northern Madagascar
Our recent geological survey of the basement of central and northern Madagascar allowed us to re-evaluate the evolution of this part of the East Africa-Antarctica Orogen (EAAO). Five crustal domains are recognized, characterized by distinctive lithologies and histories of sedimentation, magmatism, deformation and metamorphism, and separated by tectonic and/or unconformable contacts. Four consist lAuthorsR. M. Key, P. E. J. Pitfield, Ronald J. Thomas, K. M. Goodenough, D. Waele, D. I. Schofield, W. Bauer, M. S. A. Horstwood, M.T. Styles, J. Conrad, J. Encarnacion, D. J. Lidke, E. A. O'connor, C. Potter, R. A. Smith, G. J. Walsh, A.V. Ralison, T. Randriamananjara, J. M. Rafahatelo, M. RabarimananaLate Pleistocene to Holocene sedimentation and hydrocarbon seeps on the continental shelf of a steep, tectonically active margin, southern California, USA
Small, steep, uplifting coastal watersheds are prolific sediment producers that contribute significantly to the global marine sediment budget. This study illustrates how sedimentation evolves in one such system where the continental shelf is largely sediment-starved, with most terrestrial sediment bypassing the shelf in favor of deposition in deeper basins. The Santa Barbara-Ventura coast of southAuthorsAmy E. Draut, Patrick E. Hart, T.D. Lorenson, Holly F. Ryan, Florence L. Wong, Ray W. Sliter, James E. ConradComments on potential geologic and seismic hazards affecting proposed liquefied natural gas site in Santa Monica Bay, California
In a letter to the U.S. Geological Survey (USGS) dated March 25, 2008, Representative Jane Harman (California 36th district) requested advice on geologic hazards that should be considered in the review of a proposed liquefied natural gas (LNG) facility off the California coast in Santa Monica Bay. In 2004, the USGS responded to a similar request from Representative Lois Capps, regarding two proposAuthorsStephanie L. Ross, Homa J. Lee, Tom E. Parsons, Larry A. Beyer, David M. Boore, James E. Conrad, Brian D. Edwards, Michael A. Fisher, Arthur D. Frankel, Eric L. Geist, Kenneth W. Hudnut, Susan E. Hough, Robert E. Kayen, T.D. Lorenson, Nicolas Luco, Patricia A. McCrory, Mary McGann, Manuel Nathenson, Michael Nolan, Mark D. Petersen, Daniel J. Ponti, Charles L. Powell, Holly F. Ryan, John C. Tinsley, Chris J. Wills, Florence L. Wong, Jingping XuHigh-resolution chirp and mini-sparker seismic-reflection data from the southern California continental shelf — Gaviota to Mugu Canyon
The U.S. Geological Survey (USGS) collected high-resolution shallow seismic-reflection data in September, 2007, and June-July, 2008, from the continental shelf offshore of southern California between Gaviota and Mugu Canyon, in support of the California's State Waters Mapping Program. Data were acquired using SIG 2mille mini-sparker and Edgetech chirp 512 instruments aboard the R/V Zephyr (SepAuthorsRay W. Sliter, Peter J. Triezenberg, Patrick E. Hart, Amy E. Draut, William R. Normark, James E. ConradBenthic habitat and geologic mapping of the outer continental shelf of north-central California
The Fanny Shoal area is located between North Farallon Island and Cordell Bank approximately 40 miles west of San Francisco, California. The area lies within the Gulf of the Farallones National Marine Sanctuary (GFNMS) which is located just a few miles from San Francisco. The waters within the GFNMS are part of a nationally significant marine ecosystem encompassing a diversity of highly productiveAuthorsRoberto J. Anima, John L. Chin, James E. Conrad, Nadine E. GoldenNearshore benthic habitat GIS for the Channel Islands National Marine Sanctuary and Southern California State Fisheries Reserves, volume II
No abstract available.AuthorsGuy R. Cochrane, James E. Conrad, Jane A. Reid, Sarah Fangman, Nadine E. GoldenStyle and age of late Oligocene-early Miocene deformation in the southern Stillwater Range, west central Nevada: Paleomagnetism, geochronology, and field relations
Paleomagnetic and geochronologic data combined with geologic mapping tightly restrict the timing and character of a late Oligocene to early Miocene episode of large magnitude extension in the southern Stillwater Range and adjacent regions of west central Nevada. The southern Stillwater Range was the site of an Oligocene to early Miocene volcanic center comprising (1) 28.3 to 24.3 Ma intracaldera aAuthorsMark R. Hudson, David John, James E. Conrad, Edwin H. McKeeCorrelation and description of map units for the geologic map of the northern part of the Simpson Park Mountains (Rocky Hills and western part of the Pete Hanson Creek quadrangles), Eureka County, Nevada
No abstract available.AuthorsEdwin H. McKee, James E. Conrad40Ar/39Ar dating of vein amphibole from the Bayan Obo iron-rare earth element-niobium deposit, Inner Mongolia, China; constraints on mineralization and deposition of the Bayan Obo Group
No abstract available.AuthorsJames E. Conrad, Edwin H. McKeeAge of tephra beds at the Ocean Point dinosaur locality, North Slope, Alaska, based on K-Ar and 40Ar/39Ar analyses
No abstract available.AuthorsJames E. Conrad, Edwin H. McKee, Brent D. TurrinMineral resources of the El Dorado and Ireteba Peaks Wilderness Study Areas, Clark County, Nevada
No abstract available.AuthorsJames E. Conrad, G. A. Nowlan, J. D. Causey, M. S. MillerMineral resources of the Diablo Mountain Wilderness Study Area, Lake County, Oregon
No abstract available.AuthorsMichael F. Diggles, Harley D. King, Mark E. Gettings, James E. Conrad, Don L. Sawatzky, Gerilyn S. Soreghan, Thomas J. Peters, Spencee L. Willett - News