Janet T. Watt
2015
Faults -- San Simeon map area [sheet 1]
vector digital data
Janet T. Watt
Samuel Y. Johnson
Stephen R. Hartwell
Michelle Roberts
2015
Offshore Geology and Geomorphology from Point Piedras Blancas to Pismo Beach, San Luis Obispo and Santa Barbara Counties, California
map
Scientific Investigations Map
SIM 3327
Reston, VA
U.S. Geological Survey
https://dx.doi.org/10.3133/sim3327
https://pubs.usgs.gov/sim/3327/
This part of SIM 3327 presents data for faults on the offshore geologic and geomorphic map of the San Simeon map area, in the vicinity of Point Piedras Blancas, California. The vector data file is included in "Faults_SanSimeon.zip," which is accessible from https://pubs.usgs.gov/sim/3327/data/sim3327_data_catalog.html.
Faults shown on these maps are near-surface (upper about 200 m) structures that are mapped primarily on the basis of interpretation of minisparker seismic-reflection data (tracklines shown in fig. 2 on sheets 2, 4, 6; see also, Sliter and others, 2009). These fault and fold interpretations were further modified on the basis of multibeam imagery and magnetic data; these laterally continuous datasets allow for more accurate interpolation of structures between the seismic-reflection profiles. However, we do not infer fault activity from these data, as we have no direct age data for surficial sediments.
Offshore faults are symbolized as follows: a solid line is used where the location is certain; a dashed line, where the location is inferred; and a dotted line, where the location is concealed. In addition, queries are added where the existence of a feature is questionable. A fault or fold is mapped as inferred when its location is determined by interpolating between seismic-reflection profiles, as well as in bedrock outcrops where a lineament exists in the multibeam imagery but where clear evidence of fault offset or folded strata is lacking. A fault or fold is mapped as concealed where it can be identified in seismic-reflection data but where no surface deformation is apparent in either multibeam imagery or seismic-reflection data. However, it is important to note that, in areas where multibeam imagery does not exist, a fault mapped as concealed may, in fact, have surface expression that is at a scale undetectable in the seismic-reflection data alone. Therefore, it is possible that the location of a fault or fold mapped as concealed may be just as accurate as that of a fault or fold whose location is mapped with more certainty (that is, with a solid or dashed line).
Magnetic data are particularly useful in guiding structural interpretations where massive Mesozoic bedrock is at or near the seafloor surface because, in these areas, seismic-reflection data often are poor owing to lack of penetration. Such is the case in the nearshore areas from Point Piedras Blancas to Shell Beach, which, with the exception of sediment-covered areas in central Estero Bay, are characterized by bedrock outcrops of predominantly Mesozoic basement rocks that are composed of variably magnetic rock types. Magnetic anomalies represent local spatial variations in the Earth’s magnetic field that indicate the distribution of magnetic minerals—primarily magnetite—in the underlying rocks. In many cases, the volume content of magnetic minerals can be related to rock type, and so it follows that abrupt spatial changes in the amount of magnetic minerals commonly mark lithologic or structural boundaries that would not be detectable in seismic-reflection data alone. For example, the Shoreline Fault is not detectable in seismic-reflection data but, rather, is mapped on the basis of correlation of magnetic-anomaly gradients, as well as on seafloor scarps visible in multibeam imagery.
Reference Cited:
Sliter, R.W., Triezenberg, P.J., Hart, P.E., Watt, J.T., Johnson, S.Y., and
Scheirer, D.S., 2009, High resolution seismic-reflection and marine magnetic data
along the Hosgri fault zone, central California:
U.S. Geological Survey 2009-1100, v. 1.1, https://pubs.usgs.gov/of/2009/1100/.
These data are intended for science researchers, students, policy makers, and the general public. These data can be used with geographic information systems or other software to aid in assessments and mitigation of geologic hazards in the central California coastal region and to provide sufficient geologic information for land-use and land-management decisions both onshore and offshore.
Any use of trade, product, or firm names is for descriptive purposes
only and does not imply endorsement by the
U.S. Government.
Although this Federal Geographic Data Committee-compliant metadata
file is intended to document the data set in nonproprietary form,
as well as in ArcInfo format, this metadata file may include some
ArcInfo-specific terminology.
2015
Publication Date
none planned
-121.385748
-121.000173
35.701805
35.483889
None
seafloor
geology
Global Change Master Directory (GCMD)
Oceans > Bathymetry/SeafloorTopography > Bathymetry
Oceans > Bathymetry/SeafloorTopography > Seafloor Topography
ISO 19115 Topic Category
geoscientificinformation
environment
oceans
imageryBaseMapsEarthCover
Geographic Names Information System (GNIS)
Pacific Ocean
California
San Simeon
Point Piedras Blancas
Pismo Beach
Cambria
Cayucos
Estero Bay
Morro Bay
San Luis Obispo
Point San Luis
If physical samples or materials are available, constraints on their on-site access
are described in "WR CMG Sample Distribution Policy" at URL:
http://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 & Marine Science Center
Janet Watt
Geologist
physical address
400 Natural Bridges Drive
Santa Cruz
CA
95060
USA
(831) 460-7565
(831) 427-4748
jwatt@usgs.gov
Microsoft Windows Server 2008 R2 Version 6.1 (Build 7601) Service Pack 1?; ESRI ArcGIS 10.0.0.2800
Map elements were visually checked for overshoots,
undershoots, duplicate features, polygon closure, 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.
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.
Sliter, Ray W., Triezenberg, Peter J., Hart, Patrick E., Watt, Janet T., Johnson, Samuel Y., and Scheirer, Daniel S.,
2009
High-Resolution Seismic-Reflection and Marine Magnetic Data Along the Hosgri Fault Zone, Central California
seismic reflection profile section
U.S. Geological Survey Open-File Report
2009-1100
Menlo Park, CA
U.S. Geological Survey
https://pubs.usgs.gov/of/2009/1100/
seismic data files (.sgy files)
ASCII lat/long shotpoint files
TIFF images of processed seismic lines
20080610
20090808
ground condition
Sliter and others, 2009
Digital seismic data used to interpret subsurface geologic structure
Seafloor Mapping Lab, California State University Monterey Bay
20101231
scc01_2mbathy
raster digital data
http://seafloor.csumb.edu/SFMLwebDATA_c2.htm
http://arcims.csumb.edu/DATA_DOWNLOAD/SouthCentralCoast.SCC.2010/SCC_Blk01_2m_bathygrids.zip
digital file of gridded elevation data (ArcInfo GRID)
20100418
20100426
20100525
20100705
20100706
ground condition
CSUMB (2010)
Digital Elevation Model (2 meter resolution)
Seafloor Mapping Lab, California State University Monterey Bay
20101231
scc02_2mbathy
raster digital data
http://seafloor.csumb.edu/SFMLwebDATA_c2.htm
http://arcims.csumb.edu/DATA_DOWNLOAD/SouthCentralCoast.SCC.2010/SCC_Blk02_2m_bathygrids.zip
digital file of gridded elevation data (ArcInfo GRID)
20100423
20100525
20100706
20100707
20100708
ground condition
CSUMB (2010)
Digital Elevation Model (2 meter resolution)
Seafloor Mapping Lab, California State University Monterey Bay
20101231
scc03_2mbathy
raster digital data
http://seafloor.csumb.edu/SFMLwebDATA_c2.htm
http://arcims.csumb.edu/DATA_DOWNLOAD/SouthCentralCoast.SCC.2010/SCC_Blk03_2m.5m_bathygrids.zip
digital file of gridded elevation data (ArcInfo GRID)
20100319
20100320
20100425
20100528
20100708
20100709
ground condition
CSUMB (2010)
Digital Elevation Model (2 meter resolution)
Seafloor Mapping Lab, California State University Monterey Bay
20101231
scc05_2mbathy
raster digital data
http://seafloor.csumb.edu/SFMLwebDATA_c2.htm
http://arcims.csumb.edu/DATA_DOWNLOAD/SouthCentralCoast.SCC.2010/SCC_Blk05_2m.5m_bathygrids.zip
digital file of gridded elevation data (ArcInfo GRID)
20100415
20100427
20100813
20100818
ground condition
CSUMB (2010)
Digital Elevation Model (2 meter resolution)
Seafloor Mapping Lab, California State University Monterey Bay
20101231
scc06_2mbathy
raster digital data
http://seafloor.csumb.edu/SFMLwebDATA_c2.htm
http://arcims.csumb.edu/DATA_DOWNLOAD/SouthCentralCoast.SCC.2010/SCC_Blk06_2m_bathygrids.zip
digital file of gridded elevation data (ArcInfo GRID)
20100324
20100328
20100329
20100416
20100528
20100811
20100812
ground condition
CSUMB (2010)
Digital Elevation Model (2 meter resolution)
Seafloor Mapping Lab, California State University Monterey Bay
20101231
scc07_2mbathy
raster digital data
http://seafloor.csumb.edu/SFMLwebDATA_c2.htm
http://arcims.csumb.edu/DATA_DOWNLOAD/SouthCentralCoast.SCC.2010/SCC_Blk07_2m.5m_bathygrids.zip
digital file of gridded elevation data (ArcInfo GRID)
20100317
20100414
20100415
20100416
20100424
20100427
20100812
ground condition
CSUMB (2010)
Digital Elevation Model (2 meter resolution)
Seafloor Mapping Lab, California State University Monterey Bay
20101231
scc08_2mbathy
raster digital data
http://seafloor.csumb.edu/SFMLwebDATA_c2.htm
http://arcims.csumb.edu/DATA_DOWNLOAD/SouthCentralCoast.SCC.2010/SCC_Blk08_2m.5m_bathygrids.zip
digital file of gridded elevation data (ArcInfo GRID)
20100323
20100324
20100327
20100328
20100526
20100821
ground condition
CSUMB (2010)
Digital Elevation Model (2 meter resolution)
Ray W. Sliter, Peter J. Triezenberg, Patrick E. Hart, Janet T. Watt, Samuel Y. Johnson, and Daniel S. Scheirer
2009
High-Resolution Seismic Reflection and Marine Magnetic Data Along the Hosgri Fault Zone--Cayucos to Pismo Beach, California
seismic reflection profile section
U.S. Geological Survey Open-File Report
2009-1100
Menlo Park, CA
U.S. Geological Survey
https://pubs.usgs.gov/of/2009/1100/
seismic data files (.sgy files)
ASCII lat/long shotpoint files
TIFF images of processed seismic lines
20080610
20090808
ground condition
Sliter and others, 2009
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 Sliter and others (2009). Faults were then adjusted based on faulting apparent in the multibeam bathymetry data.
2009-2012
Vector
String
180
WGS 1984 UTM Zone 10N
0.9996
-123.0
0.0
500000.0
0.0
coordinate pair
0.000100
0.000100
Meter
D WGS 1984
WGS 1984
6378137.0
298.257224
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_Length
Length of feature in internal units.
ESRI
Positive real numbers that are automatically generated.
U.S. Geological Survey, Coastal and Marine Geology Program
Janet Watt
mailing and physical address
400 Natural Bridges Drive
Santa Cruz
CA
95060-5792
US
831-460-7565
831-427-4748
jwatt@usgs.gov
This information is not intended for navigational purposes.
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.
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.
201301
201201
U.S. Geological Survey, Coastal and Marine Geology Program
Steve 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