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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Canada
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Western Canada
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British Columbia (1)
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Cascade Range (1)
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Cascadia subduction zone (1)
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Crater Lake (1)
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Pacific Ocean
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East Pacific
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Northeast Pacific
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Santa Monica Basin (1)
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North Pacific
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Northeast Pacific
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Santa Monica Basin (1)
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Queen Charlotte Fault (1)
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San Pedro Basin (1)
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United States
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Alaska (1)
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California
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Central California (1)
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Channel Islands
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San Clemente Island (1)
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Hosgri Fault (1)
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Los Angeles County California
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Los Angeles California (2)
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San Clemente Island (1)
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Santa Barbara Channel (1)
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Santa Monica Mountains (1)
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Southern California (6)
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Ventura Basin (1)
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Oregon
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Klamath County Oregon (1)
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Washington
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Olympic Peninsula (1)
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elements, isotopes
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carbon
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C-13/C-12 (1)
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isotope ratios (1)
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isotopes
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stable isotopes
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C-13/C-12 (1)
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geologic age
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Cenozoic
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Quaternary
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Holocene
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upper Holocene (1)
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Pleistocene
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upper Pleistocene (1)
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upper Quaternary (1)
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Tertiary
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Neogene (1)
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metamorphic rocks
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turbidite (2)
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minerals
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carbonates (1)
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Primary terms
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Canada
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Western Canada
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British Columbia (1)
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carbon
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C-13/C-12 (1)
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Cenozoic
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Quaternary
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Holocene
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upper Holocene (1)
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Pleistocene
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upper Pleistocene (1)
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upper Quaternary (1)
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Tertiary
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Neogene (1)
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continental shelf (4)
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continental slope (2)
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crust (1)
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deformation (1)
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earthquakes (4)
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faults (7)
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folds (1)
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geophysical methods (7)
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hydrology (1)
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isotopes
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stable isotopes
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C-13/C-12 (1)
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Ocean Drilling Program (1)
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ocean floors (5)
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Pacific Ocean
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East Pacific
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Northeast Pacific
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Santa Monica Basin (1)
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North Pacific
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Northeast Pacific
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Santa Monica Basin (1)
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paleogeography (1)
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plate tectonics (1)
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sea-level changes (2)
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sedimentation (1)
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sediments
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clastic sediments (1)
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marine sediments (3)
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tectonics
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neotectonics (1)
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United States
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Alaska (1)
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California
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Central California (1)
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Channel Islands
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San Clemente Island (1)
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Hosgri Fault (1)
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Los Angeles County California
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Los Angeles California (2)
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San Clemente Island (1)
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Santa Barbara Channel (1)
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Santa Monica Mountains (1)
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Southern California (6)
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Ventura Basin (1)
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Oregon
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Klamath County Oregon (1)
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Washington
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Olympic Peninsula (1)
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sedimentary rocks
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turbidite (2)
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sediments
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sediments
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clastic sediments (1)
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marine sediments (3)
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turbidite (2)
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Post-glacial stratigraphy and late Holocene record of great Cascadia earthquakes in Ozette Lake, Washington, USA
Focused fluid flow and methane venting along the Queen Charlotte fault, offshore Alaska (USA) and British Columbia (Canada)
Morphology, structure, and kinematics of the San Clemente and Catalina faults based on high-resolution marine geophysical data, southern California Inner Continental Borderland (USA)
Right‐Lateral Fault Motion along the Slope‐Basin Transition, Gulf of Santa Catalina, Southern California
Abstract An active fault system carrying a significant component of right-lateral strike-slip motion extends for ~60 km along the slope–basin transition, ~10 to 20 km offshore of the southern California coast from La Jolla to Dana Point. From south to north, this fault system includes the Carlsbad, San Onofre, and San Mateo fault zones. High-resolution single channel minisparker and chirp seismic reflection data gathered from 2006 to 2011 reveal complex and variable fault zones that are generally characterized by nearly vertical to steeply east-dipping faults with a reverse slip component. The Carlsbad fault zone shows evidence of reverse motion followed by normal separation and probably also includes a component of strike-slip offset. The San Onofre fault zone shows clear evidence of right-lateral slip, offsetting submarine gullies near the base of the slope by approximately 60 m. North of these offset gullies, the base of the slope bends about 30° to the west, following the trend of the San Mateo fault zone, but strands of the San Onofre fault zone trend obliquely up slope, appearing to merge with the Newport–Inglewood fault zone at the shelf edge. These San Onofre fault strands consist of several en echelon left-stepping segments separated by “pop-up” structures, which imply a significant component of right-lateral offset that may serve to transfer right-lateral slip from faults along the base of the slope to the Newport–Inglewood fault zone. Using approximate base Quaternary and base Holocene reflections, segments of the Carlsbad and San Onofre fault zones appear to have experienced right-lateral motion in the Holocene, whereas deformation along the San Mateo fault zone appears to represent a period of mostly pre-Quaternary transpression.
The Tectonically Controlled San Gabriel Channel–Lobe Transition Zone, Catalina Basin, Southern California Borderland
Shelf evolution along a transpressive transform margin, Santa Barbara Channel, California
Offset of Latest Pleistocene Shoreface Reveals Slip Rate on the Hosgri Strike‐Slip Fault, Offshore Central California
Introduction to surficial seafloor mapping and characterization
The seafloor off greater Los Angeles, California, has been extensively studied for the past century. Terrain analysis of recently compiled multibeam bathymetry reveals the detailed seafloor morphology along the Los Angeles Margin and San Pedro Basin. The terrain analysis uses the multibeam bathymetry to calculate two seafloor indices, a seafloor slope, and a Topographic Position Index. The derived grids along with depth are analyzed in a hierarchical, decision-tree classification to delineate six seafloor provinces—high-relief shelf, low-relief shelf, steep-basin slope, gentle-basin slope, gullies and canyons, and basins. Rock outcrops protrude in places above the generally smooth continental shelf. Gullies incise the steep-basin slopes, and some submarine canyons extend from the coastline to the basin floor. San Pedro Basin is separated from the Santa Monica Basin to the north by a ridge consisting of the Redondo Knoll and the Redondo Submarine Canyon delta. An 865-m-deep sill separates the two basins. Water depths of San Pedro Basin are ~100 m deeper than those in the San Diego Trough to the south, and three passes breach a ridge that separates the San Pedro Basin from the San Diego Trough. Information gained from this study can be used as base maps for such future studies as tectonic reconstructions, identifying sedimentary processes, tracking pollution transport, and defining benthic habitats.
Late Quaternary turbidite and related gravity-flow deposits have accumulated in basins of the California Borderland under a variety of conditions of sediment supply and sea-level stand. The northern basins (Santa Barbara, Santa Monica, and San Pedro) are closed and thus trap virtually all sediment supplied through submarine canyons and smaller gulley systems along the basin margins. The southern basins (Gulf of Santa Catalina and San Diego Trough) are open, and, under some conditions, turbidity currents flow from one basin to another. Seismic-reflection profiles at a variety of resolutions are used to determine the distribution of late Quaternary turbidites. Patterns of turbidite-dominated deposition during lowstand conditions of oxygen isotope stages 2 and 6 are similar within each of the basins. Chronology is provided by radiocarbon dating of sediment from two Ocean Drilling Program sites, the Mohole test-drill site, and large numbers of piston cores. High-resolution, seismic-stratigraphic frameworks developed for Santa Monica Basin and the open southern basins show rapid lateral shifts in sediment accumulation on scales that range from individual lobe elements to entire fan complexes. More than half of the submarine fans in the Borderland remain active at any given position of relative sea level. Where the continental shelf is narrow, canyons are able to cut headward during sea-level transgression and maintain sediment supply to the basins from rivers and longshore currents during highstands. Rivers with high bedload discharge transfer sediment to submarine fans during both highstand and lowstand conditions.