Faults--Offshore Scott Creek, California

Dates

Publication Date: 2015
Start Date: 2009
End Date: 2012

Citation

S.R. Hartwell, S.Y. Johnson, and C.W. Davenport, 2015, Faults--Offshore Scott Creek, California: .

Summary

This part of DS 781 presents data for the faults for the geologic and geomorphic map of the Offshore of Scott Creek map area, California. The vector data file is included in "Faults_OffshoreScottCreek.zip," which is accessible from http://dx.doi.org/10.5066/F7CJ8BJW.The offshore of Scott Creek map area straddles the right-lateral San Gregorio Fault Zone, an important structure in the distributed transform boundary between the North American and Pacific plates (see, for example, Dickinson and others, 2005). Regionally, this fault is part of a system that occurs predominantly in the offshore for about 400 km from Point Conception in the south (where it is known as the Hosgri fault; Johnson and Watt, 2012) to Bolinas and Point Reyes in [...]

Summary

This part of DS 781 presents data for the faults for the geologic and geomorphic map of the Offshore of Scott Creek map area, California. The vector data file is included in "Faults_OffshoreScottCreek.zip," which is accessible from http://dx.doi.org/10.5066/F7CJ8BJW.The offshore of Scott Creek map area straddles the right-lateral San Gregorio Fault Zone, an important structure in the distributed transform boundary between the North American and Pacific plates (see, for example, Dickinson and others, 2005). Regionally, this fault is part of a system that occurs predominantly in the offshore for about 400 km from Point Conception in the south (where it is known as the Hosgri fault; Johnson and Watt, 2012) to Bolinas and Point Reyes in the north (Bruns and others, 2002; Ryan and others, 2008). The San Gregorio Fault in the map area is part of a 90-km-long offshore segment that extends from Point Sur on the south, across outer Monterey Bay to Point Año Nuevo (just one kilometer north of the map area) on the north; Weber and Lajoie, 1980; Brabb, 1997; Wagner and others, 2002). Offshore parts of this fault system are identified on seismic-reflection data based on abrupt truncation or warping of reflections and (or) juxtaposition of reflection panels with different seismic parameters. In this map area, the San Gregorio Fault forms a distributed about 2-km-wide shear zone that includes two main faults. The nearshore eastern part of the zone, which includes the Coastways Fault, partly coincides with a prominent bathymetric lineament on the outer flank of nearshore bedrock outcrops between Waddell Creek and Davenport. The western part of the zone, which includes the Frijoles Fault, cuts across the flat, sediment-covered shelf. Cumulative lateral slip on San Gregorio Fault Zone in this region is thought to range from 4 to 10 mm/yr (Weber, 1994).McCulloch (1987) considered the San Gregorio Fault Zone the eastern margin of the Outer Santa Cruz Basin (fig. 8-1). Farther offshore, outside California's State Waters but within the map area, this basin is cut by the northwest-trending Ascension Fault (Greene and others, 2002; U.S. Geological Survey and California Geological Survey, 2010).References CitedBrabb, E.E., 1997, Geologic Map of Santa Cruz County, California: A digital database, US Geological Survey Open-File Report 97-489, 1:62,500.Bruns, T.R., Cooper, A.K., Carlson, P.R., and McCulloch, D.S., 2002, Structure of the submerged San Andreas and San Gregorio Fault zones in the Gulf of Farallones as inferred from high-resolution seismic-reflection data, in Parsons, T. (ed.), Crustal structure of the coastal and marine San Francisco Bay region, California: U.S. Geological Survey Professional Paper 1658, p. 77-117.Dickinson, W.R., Ducea, M., Rosenberg, L.I., Greene, H.G., Graham, S.A., Clark, J.C., Weber, G.E., Kidder, S., Ernst, W.G., and Brabb, E.E., 2005, Net dextral slip, Neogene San Gregorio - Hosgri fault zone, coastal California - Geologic evidence and tectonic implications: Geological Society of America Special Paper 391, 43 p.Greene, H.G., Maher, N.M., and Paull, C.K., 2002, Physiography of the Monterey Bay National Marine Sanctuary and implications about continental margin development: Marine Geology, v. 181, p. 55-82.Johnson, S.Y., and Watt, J.T., 2012, Influence of fault trend, bends, and convergence on shallow structure and geomorphology of the Hosgri strike-slip fault, offshore Central California: Geosphere, v.McCulloch, D.S., 1987, Regional geology and hydrocarbon potential of offshore central California, in Scholl, D.W., Grantz, A., and Vedder, J.G., eds., Geology and Resource Potential of the Continental Margin of Western North America and Adjacent Oceans -- Beaufort Sea to Baja California: Houston, Texas, Circum-Pacific Council for Energy and Mineral Resources, Earth Science Series, v. 6., p. 353-401.Ryan, H.F., Parsons, T., and Sliter, R.W., 2008. Vertical tectonic deformation associated with the San Andreas fault zone offshore of San Francisco, California: Tectonphysics, v. 429, p. 209-224.Weber, G.E., and LaJoie, K.R., 1980, Map of Quaternary faulting along the San Gregorio fault zone, San Mateo and Santa Cruz counties, California: US Geological Survey Open-File Report 80-907.Wagner, D.L., Greene, H.G., Saucedo, G.J., and Pridmore, C.L., 2002, Geologic Map of the Monterey 30' x 60' quadrangle and adjacent areas, California: California Geological Survey Regional Geologic Map Series, scale 1:100,000.

Contacts

Point of Contact :: USGS Pacific Coastal and Marine Science Center
Distributor :: U.S. Geological Survey
Metadata Contact :: U.S. Geological Survey, Coastal and Marine Geology Program
Originator :: S.R. Hartwell, S.Y. Johnson, C.W. Davenport

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Faults_OffshoreScottCreek_metadata.xml Original FGDC Metadata	View	18.98 KB
Faults_OffshoreScottCreek.lyr		8.5 KB
Faults_OffshoreScottCreek_metadata.html		33.77 KB
Faults_OffshoreScottCreek_metadata.txt		21.6 KB
Faults_OffshoreScottCreek_metadata_faq.html		29.14 KB

Shapefile: Faults_OffshoreScottCreek.zip
Faults_OffshoreScottCreek.shp		9.24 KB
Faults_OffshoreScottCreek.dbf		14.54 KB
Faults_OffshoreScottCreek.shx		532 Bytes
Faults_OffshoreScottCreek.prj		403 Bytes
Faults_OffshoreScottCreek.shp.xml		34.25 KB
Faults_OffshoreScottCreek.sbn		636 Bytes
Faults_OffshoreScottCreek.sbx		156 Bytes
Faults_OffshoreScottCreek.CPG		5 Bytes

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Faults offshore Scott Creek.	https://www.sciencebase.gov/catalog/file/get/556618fde4b0d9246a9ec12c?f=__disk__79%2F23%2F08%2F792308310e34cc370b9daac562605feac14a8abd&width=150&height=149

Type: webLink

SHP	https://www.sciencebase.gov/catalog/file/get/55661f28e4b0d9246a9ec155
SHP	https://www.sciencebase.gov/catalog/

Purpose

To expand geologic mapping to the seafloor within California's State Waters, to update coastal geologic mapping, and to contribute to auniform regional geologic database. Additionally, to provide a geologic map for the public and geoscience community to aid in assessments andmitigation of geologic hazards in the Scott Creek coastal region and to provide sufficient geologic information for land-use andland-management decisions both onshore and offshore. This information is not intended for navigational purposes

Faults--Offshore Scott Creek, California

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