Dataset Identification:
Resource Abstract:
- description: This part of DS 781 presents data for the folds for the geologic and geomorphic map of the Offshore Monterey
map area, California. The vector data file is included in "Folds_OffshoreMonterey.zip," which is accessible from
http://dx.doi.org/10.3133/ofr20161110. The shelf north and east of the Monterey Bay Peninsula in the Offshore of Monterey
map area is cut by a diffuse zone of northwest striking, steeply dipping to vertical faults comprising the Monterey Bay Fault
Zone (MBFZ). This zone, originally mapped by Greene (1977, 1990), extends about 45 km across Monterey Bay (Map E on sheet
9). Fault strands within the MBFZ are mapped with high-resolution seismic-reflection profiles (sheet 8). Seismic-reflection
profiles traversing this diffuse zone in the map area cross as many as 5 faults over a width of about 4 to 5 km (see, for
example, figs. 3 and 5 on sheet 8). The zone lacks a continuous "master fault," along which deformation is concentrated.
Fault length ranges up to about 20 km (based on mapping outside this map area), but most strands are only about 2- to 7-km
long. Faults in this diffuse zone cut through Neogene bedrock and locally appear to minimally disrupt overlying inferred Quaternary
sediments. The presence of warped reflections along some fault strands suggests that fault offsets may be both vertical and
strike-slip. Specific offshore faults within the zone that are continuous with mapped onshore faults include the Navy Fault,
Chupines Fault, and Ord Terrace Fault (Clark and others, 1997; Wagner and others, 2002). Carmel Canyon, a relatively straight
northwest-trending arm of the Monterey Canyon system, extends through the southwestern part of the Offshore of Monterey map
area. Carmel Canyon has three heads (Greene and others, 2002), two of which extend east and northeast into Carmel Bay within
the map area; the third head extends southeast along the main canyon trend for about 3 km beyond the confluence with the heads
in Carmel Bay. Carmel Canyon is aligned with and structurally controlled by the San Gregorio fault zone (Greene and others,
1991), an important structure in the distributed transform boundary between the North American and Pacific plates (see, for
example, Dickinson and others, 2005). This Fault Zone is part of a regional fault system that is present 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 Zone
in the map area is part of a 90-km-long offshore segment that extends northward from Point Sur (about 24 km south of the map
area), across outer Monterey Bay to Point Ao Nuevo (51 km north of the map area) (see sheet 9; see also, Weber and Lajoie,
1980; Brabb and others, 1998; Wagner and others, 2002). High-resolution seismic-reflection data collected across the canyon
do not clearly image the San Gregorio Fault Zone, due largely to significant depth and steep canyon walls. Accordingly, we
have mapped the 1,000- 1,300-m-wide fault zone largely on the presence of prominent, lengthy, geomorphic lineaments (sheets
1 and 2) and both geomorphic and lithologic contrasts across the fault. Folds were primarily mapped by interpretation of seismic
reflection profile data (see OFR 2013-1071). The seismic reflection profiles were collected between 2007 and 2010. References
Cited 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, available at http://pubs.usgs.gov/pp/1658/. Brabb, E.E., 1997, Geologic Map of Santa Cruz County,
California: A digital database, US Geological Survey Open-File Report 97€“489, 1:62,500. Clark, J.C., Dupre, W.R.,
and Rosenberg, L.L., 1997, Geologic map of the Monterey and Seaside 7.5€“minute quadrangles, Monterey County, California€“A
digital database: U.S. Geological Survey Open-File Report 97-30, 2 sheets, scale 1:24,000, http://pubs.usgs.gov/of/1997/of97-030/
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. Greene, H.G., Clarke, S.H. and Kennedy, M.P., 1991. Tectonic Evolution of Submarine
Canyons Along the California Continental Margin. From Shoreline to Abyss, in Osborne, R.H., ed., Society for Sedimentary Geology,
Special Publication No. 46, p. 231€“248. Greene, H.G., 1990, Regional tectonics and structural evolution of the
Monterey Bay region, central California, in Garrison, R.E., Greene, H.G., Hicks, K.R., Weber, G.E., and Wright, T.L., eds.,
Geology and tectonics of the central California coastal region, San Francisco to Monterey: American Association of Petroleum
Geologists, Pacific Section, Guidebook GB67, p. 31€“56. Greene, H.G., 1977, Geology of the Monterey Bay region:
U.S. Geological Survey Open-File Report 77€“718, 347 p. Greene, H.G., 1990, Regional tectonics and structural evolution
of the Monterey Bay region, central California, in Garrison, R.E., Greene, H.G., Hicks, K.R., Weber, G.E., and Wright, T.L.,
eds., Geology and tectonics of the central California coastal region, San Francisco to Monterey, Pacific Section American
Association of Petroleum Geologists, Guidebook GB-67, p. 31€“56. 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. 8, p. 1,632€“1,656, doi:10.1130/GES00830.1. 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: Tectonophysics,
v. 429, p. 209€“224, doi:10.1016/j.tecto.2008.06.011. 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. 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: U.S. Geological Survey Open-File Report 80€“907,
3 sheets, scale 1:24,000, available at http://pubs.er.usgs.gov/publication/ofr80907.; abstract: This part of DS 781 presents
data for the folds for the geologic and geomorphic map of the Offshore Monterey map area, California. The vector data file
is included in "Folds_OffshoreMonterey.zip," which is accessible from http://dx.doi.org/10.3133/ofr20161110. The
shelf north and east of the Monterey Bay Peninsula in the Offshore of Monterey map area is cut by a diffuse zone of northwest
striking, steeply dipping to vertical faults comprising the Monterey Bay Fault Zone (MBFZ). This zone, originally mapped by
Greene (1977, 1990), extends about 45 km across Monterey Bay (Map E on sheet 9). Fault strands within the MBFZ are mapped
with high-resolution seismic-reflection profiles (sheet 8). Seismic-reflection profiles traversing this diffuse zone in the
map area cross as many as 5 faults over a width of about 4 to 5 km (see, for example, figs. 3 and 5 on sheet 8). The zone
lacks a continuous "master fault," along which deformation is concentrated. Fault length ranges up to about 20 km
(based on mapping outside this map area), but most strands are only about 2- to 7-km long. Faults in this diffuse zone cut
through Neogene bedrock and locally appear to minimally disrupt overlying inferred Quaternary sediments. The presence of warped
reflections along some fault strands suggests that fault offsets may be both vertical and strike-slip. Specific offshore faults
within the zone that are continuous with mapped onshore faults include the Navy Fault, Chupines Fault, and Ord Terrace Fault
(Clark and others, 1997; Wagner and others, 2002). Carmel Canyon, a relatively straight northwest-trending arm of the Monterey
Canyon system, extends through the southwestern part of the Offshore of Monterey map area. Carmel Canyon has three heads (Greene
and others, 2002), two of which extend east and northeast into Carmel Bay within the map area; the third head extends southeast
along the main canyon trend for about 3 km beyond the confluence with the heads in Carmel Bay. Carmel Canyon is aligned with
and structurally controlled by the San Gregorio fault zone (Greene and others, 1991), an important structure in the distributed
transform boundary between the North American and Pacific plates (see, for example, Dickinson and others, 2005). This Fault
Zone is part of a regional fault system that is present 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 Zone in the map area is part of a 90-km-long offshore segment
that extends northward from Point Sur (about 24 km south of the map area), across outer Monterey Bay to Point Ao Nuevo (51
km north of the map area) (see sheet 9; see also, Weber and Lajoie, 1980; Brabb and others, 1998; Wagner and others, 2002).
High-resolution seismic-reflection data collected across the canyon do not clearly image the San Gregorio Fault Zone, due
largely to significant depth and steep canyon walls. Accordingly, we have mapped the 1,000- 1,300-m-wide fault zone largely
on the presence of prominent, lengthy, geomorphic lineaments (sheets 1 and 2) and both geomorphic and lithologic contrasts
across the fault. Folds were primarily mapped by interpretation of seismic reflection profile data (see OFR 2013-1071). The
seismic reflection profiles were collected between 2007 and 2010. References Cited 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, available at http://pubs.usgs.gov/pp/1658/.
Brabb, E.E., 1997, Geologic Map of Santa Cruz County, California: A digital database, US Geological Survey Open-File Report
97€“489, 1:62,500. Clark, J.C., Dupre, W.R., and Rosenberg, L.L., 1997, Geologic map of the Monterey and Seaside
7.5€“minute quadrangles, Monterey County, California€“A digital database: U.S. Geological Survey Open-File
Report 97-30, 2 sheets, scale 1:24,000, http://pubs.usgs.gov/of/1997/of97-030/ 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. Greene, H.G.,
Clarke, S.H. and Kennedy, M.P., 1991. Tectonic Evolution of Submarine Canyons Along the California Continental Margin. From
Shoreline to Abyss, in Osborne, R.H., ed., Society for Sedimentary Geology, Special Publication No. 46, p. 231€“248.
Greene, H.G., 1990, Regional tectonics and structural evolution of the Monterey Bay region, central California, in Garrison,
R.E., Greene, H.G., Hicks, K.R., Weber, G.E., and Wright, T.L., eds., Geology and tectonics of the central California coastal
region, San Francisco to Monterey: American Association of Petroleum Geologists, Pacific Section, Guidebook GB67, p. 31€“56.
Greene, H.G., 1977, Geology of the Monterey Bay region: U.S. Geological Survey Open-File Report 77€“718, 347 p.
Greene, H.G., 1990, Regional tectonics and structural evolution of the Monterey Bay region, central California, in Garrison,
R.E., Greene, H.G., Hicks, K.R., Weber, G.E., and Wright, T.L., eds., Geology and tectonics of the central California coastal
region, San Francisco to Monterey, Pacific Section American Association of Petroleum Geologists, Guidebook GB-67, p. 31€“56.
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. 8, p. 1,632€“1,656, doi:10.1130/GES00830.1.
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: Tectonophysics, v. 429, p. 209€“224, doi:10.1016/j.tecto.2008.06.011. 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. 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: U.S.
Geological Survey Open-File Report 80€“907, 3 sheets, scale 1:24,000, available at http://pubs.er.usgs.gov/publication/ofr80907.
Citation
- Title Folds--Offshore of Monterey Map Area, California.
-
- creation Date
2018-05-20T03:08:06.910267
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2018-08-06T21:50:25Z
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- notes: This metadata record was generated by an xslt transformation from a dc metadata record; Transform by Stephen M. Richard, based
on a transform by Damian Ulbricht. Run on 2018-08-06T21:50:25Z
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pointOfContact
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CINERGI Metadata catalog
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eng
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2007
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urn:dciso:metadataabout:ded20941-a846-4743-aae2-e8d0a45a509a
Metadata record format is ISO19139 XML (MD_Metadata)