Janet T. Watt
Michael W. Manson
H. Gary Greene
2014
Faults--Offshore of Point Reyes Map Area, California
vector digital data
Janet T. Watt
Peter Dartnell
Nadine E. Golden
H. Gary Greene
Mercedes D. Erdey
Guy R. Cochrane
Samuel Y. Johnson
Stephen R. Hartwell
Rikk G. Kvitek
Michael W. Manson
Charles A. Endris
Bryan E. Dieter
Ray W. Sliter
Lisa M. Krigsman
Erik N. Lowe
John L. Chin
2015
California State Waters Map Series--Offshore of Point Reyes map area, California
map
Open-File Report
OFR 2015-1114
Reston, VA
U.S. Geological Survey
https://pubs.usgs.gov/of/2015/1114/
Nadine E. Golden
2013
California State Waters Map Series Data Catalog
database
Data Series
DS 781
Reston, VA
U.S. Geological Survey
https://pubs.usgs.gov/ds/781/
This part of DS 781 presents data for the geologic and geomorphic map of the Offshore of Point Reyes map area, California. The vector data file is included in "Faults_OffshorePointReyes.zip," which is accessible from https://pubs.usgs.gov/ds/781/OffshorePointReyes/data_catalog_OffshorePointReyes.html.
Faults in the Point Reyes map area are identified on seismic-reflection data based on abrupt truncation or warping of reflections and (or) juxtaposition of reflection panels with different seismic parameters such as reflection presence, amplitude, frequency, geometry, continuity, and vertical sequence. The Point Reyes Fault Zone runs through the map area and is an offshore curvilinear reverse fault zone with predominantly north-side-up motion (Hoskins and Griffiths, 1971; McCulloch, 1987; Heck and others, 1990; Stozek, 2012) that likely connects with the western San Gregorio fault further to the south (Ryan and others, 2008), making it part of the San Andreas Fault System. The Point Reyes Fault Zone is characterized by a 5 to 11 km-wide zone of deformation in the shallow subsurface that is associated with two main fault structures, the Point Reyes Fault and the western Point Reyes Fault. Near the Point Reyes headland, vertical displacement of granitic basement across the Point Reyes Fault is at least 1.4 km (McCulloch, 1987). Offshore Double Point, vertical displacement on the Point Reyes Fault is difficult to assess because subsurface age constraints from nearby wells are lacking, and there are few offset horizons across the fault imaged on available seismic data. However, warping and folding of Neogene strata are clearly visible on high-resolution seismic data . The western Point Reyes Fault is defined by a broad anticlinal structure visible in both industry and high-resolution seismic datasets that exhibits that same sense of vergence (north-side-up) as the Point Reyes Fault.
Faults were primarily mapped by interpretation of seismic reflection profile data (see field activity S-8-09-NC). The seismic reflection profiles were collected in 2009.
References Cited
Heck, R.G., Edwards, E.B., Kronen, J.D., Jr., and Willingham, C.R., 1990, Petroleum potential of the offshore outer Santa Cruz and Bodega basins, 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 Bulletin GB67, p. 143-164.
Hoskins E.G., Griffiths, J.R., 1971, Hydrocarbon potential of northern and central California offshore: American Association of Petroleum Geologists Memoir 15, p. 212-228.
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 offshore of San Francisco, California: Tectonophysics, v. 475, p. 209-223.
Stozek, B.A., 2012, Geophysical evidence for Quaternary deformation within the offshore San Andreas fault system, northern California: Masters Thesis, San Francisco State University, 141 p.
To expand geologic mapping to the seafloor within the California's State Waters, to update coastal geologic mapping, and to contribute to a
uniform regional geologic database, which can be used geographic information systems.
Additionally, to provide a geologic map for the public and geoscience community to aid in assessments and mitigation of geologic hazards in the Point Reyes coastal region and to provide sufficient geologic information for land-use and land-management decisions both onshore and offshore.
This information is not intended for navigational purposes.
Map political location: Marin County, California
Compilation scale: 1:24,000
Base maps used are hillshades generated from IfSAR, LiDAR, and multibeam
mapping both onshore and offshore (see see Bathymetry--Offshore Point Reyes, California, DS 781 for more information).
2009
2009
ground condition
none planned
-123.094
-122.894
38.098
37.940
Global Change Master Directory (GCMD)
Oceans > Bathymetry/SeafloorTopography > Bathymetry
Oceans > Bathymetry/SeafloorTopography > Seafloor Topography
ISO 19115 Topic Category
geoscientificInformation
environment
oceans
imageryBaseMapsEarthCover
Multibeam bathymetry
General
Benthic marine habitat
Seafloor mapping
Offshore geology
GIS
Geographic Names Information System (GNIS)
Pacific Ocean
State of California
Point Reyes
Drakes Bay
Marin County
Drakes Estero
If physical samples or materials are available, constraints on their on-site access are described in "WR CMG Sample Distribution Policy"
at URL: https://walrus.wr.usgs.gov/infobank/programs/html/main/sample-dist-policy.html
This information is not intended for navigational purposes.
Read and fully comprehend the metadata prior to data use. Uses of these
data should not violate the spatial resolution of the data. Where
these data are used in combination with other data of different resolution, the resolution of the combined output will be limited by the lowest resolution of all the data.
Acknowledge the U.S. Geological Survey in products derived from these data. Share data products developed using these data with the U.S. Geological Survey.
This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.
Although this Federal Geographic Data Committee-compliant metadata file is intended to document these data in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology.
USGS Pacific Coastal and Marine Science Center
Stephen Hartwell
Geologist
physical address
400 Natural Bridges Drive
Santa Cruz
CA
95060
USA
(831) 460-7814
(831) 427-4748
shartwell@usgs.gov
https://pubs.usgs.gov/ds/781/OffshorePointReyes/images/Faults_OffshorePointReyes.jpg
Faults Offshore of Point Reyes map area.
JPEG
Microsoft Windows Server 2008 R2 Version 6.1 (Build 7601) Service Pack 1; ESRI ArcGIS 10.0.0.2414
Map elements were visually checked for overshoots,
undershoots, duplicate features, and other errors by the
lead authors and by the GIS technician(s) who created the digital database.
Review drafts of the map were reviewed internally by at least two other geologists for consistency
with basic geologic principles and general conformity to USGS mapping
standards.
Data are complete: no offshore features that could be accurately identified and
represented at the compilation scale of 1:24,000 were eliminated or
generalized. The smallest area represented is approximately 100 square
meters. All geospatial database elements are attributed.
Faults were primarily mapped by interpretation of seismic reflection profile data (see S-15-10-NC).
Faults lines were digitized by heads-up screen digitization on to shot-point picks from seismic-
line navigation data - each shot point has an associated lat/long in the survey data. Error is introduced
from layback, as well as from interpretation of oblique features, so horizontal accuracy of fault and fold
location is estimated to be on the order of 10 to 20 meters.
U.S. Geological Survey (USGS) , Coastal and Marine Geology Program (CMGP)
2013
Subbottom survey data of field activity S-8-09-NC in Stinson Beach to Point Arena (CA) from 09/08/2009 to 09/30/2009
Menlo Park, CA
U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
http://walrus.wr.usgs.gov/infobank/gos/s-8-09-nc.fmeta.xml
http://walrus.wr.usgs.gov/infobank/s/s809nc/html/s-8-09-nc.meta.html
ASCII lat/long shot point files
20090908
20090930
ground condition
S-8-09-NC
Digital seismic data used to interpret subsurface geologic structure
Faults were mapped onto shot lines based on the latitude and longitude of seismic picks from field activity S-8-09-NC.
2011
Vector
String
3
WGS 1984 UTM Zone 10N
0.9996
-123.0
0.0
500000.0
0.0
coordinate pair
0.0001
0.0001
Meter
D WGS 1984
WGS 1984
6378137.0
298.257223563
Faults
lines representing mapped faults
This report
FID
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
Shape
Feature geometry.
ESRI
Coordinates defining the features.
FGDCRefNo
FGDC Digital Cartographic Standard for geologic map symbolization
This report
text field containing the reference number for the FGDC Digital Cartographic Standard for geologic map symbolization
Shape_Leng
Length of feature in internal units.
ESRI
Positive real numbers that are automatically generated.
U.S. Geological Survey
mailing and physical address
345 Middlefield Rd
Menlo Park
CA
94025-3561
USA
(650) 329-4309
These databases, identified as fault maps of offshore Point Reyes and Vicinity, California have been approved for release and publication by the U.S. Geological Survey (USGS). Although these databases have been subjected to rigorous review and are substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.
Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein.
Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
These data are not intended for navigational use.
SHP
ArcMap (version 10.0, ESRI , 2011)
Point, line, and polygon features are in shapefile format and are projected in UTM Zone 10 coordinates, with datum WGS84.
The .zip file for a shapefile includes the .aux, .dbf, .shp, .shx, .sbx, and .sbn files, as well as the text (.txt) and XML (.shp.xml) versions of the metadata for the Faults data layer of Offshore Point Reyes, California.
WinZip
0.2
https://pubs.usgs.gov/ds/781/OffshorePointReyes/data/Faults_OffshorePointReyes.zip
https://pubs.usgs.gov/ds/781/
Data can be downloaded via the World Wide Web (WWW)
none
The downloadable data file has been compressed with the "zip" command and can be unzipped with Winzip (or other tool) on Windows systems. To utilize these data, the user must have software capable of uncompressing the WinZip file and importing and viewing an Esri ArcMap SHP. Users should download the ArcGIS Project File, OffshorePointReyesGIS.mxd.zip, a compressed (with the "zip" command) version of the ArcMap document (.mxd) that has all the data layers loaded in the table of contents for "Offshore Point Reyes" and has all the data symbolized as on the OFR map sheets. Download and save this ArcGIS project file, including all data layers, to the directory the user has created for this GIS.
20140923
20150610
U.S. Geological Survey, Coastal and Marine Geology Program
Stephen R. Hartwell
mailing and physical address
400 Natural Bridges Drive
Santa Cruz
CA
95060-5792
US
831-460-7814
831-427-4748
shartwell@usgs.gov
FGDC Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998