Folds--Offshore of Fort Ross Map Area, California
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Metadata:
- Identification_Information:
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- Citation:
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- Citation_Information:
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- Originator: S.Y. Johnson
- Originator: S.R. Hartwell
- Originator: M.W. Manson
- Publication_Date: 2014
- Title: Folds--Offshore of Fort Ross Map Area, California
- Geospatial_Data_Presentation_Form: vector digital data
- Larger_Work_Citation:
-
- Citation_Information:
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- Originator: Samuel Y. Johnson
- Originator: Peter Dartnell
- Originator: Nadine E. Golden
- Originator: Stephan R. Hartwell
- Originator: H. Gary Greene
- Originator: Mercedes D. Erdey
- Originator: Guy R. Cochrane
- Originator: Janet L. Watt
- Originator: Rikk G. Kvitek
- Originator: Michael W. Manson
- Originator: Charles A. Endris
- Originator: Bryan E. Dieter
- Originator: Lisa M. Krigsman
- Originator: Ray W. Sliter
- Originator: Erik N. Lowe
- Originator: John L. Chin
- Publication_Date: 2015
- Title:
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California State Waters Map Series—Offshore of Fort Ross, California
- Geospatial_Data_Presentation_Form: map
- Series_Information:
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- Series_Name: Open-File Report
- Issue_Identification: OFR 2015–1211
- Publication_Information:
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- Publication_Place: Reston, VA
- Publisher: U.S. Geological Survey
- Online_Linkage: https://dx.doi.org/10.3133/ofr20151211
- Larger_Work_Citation:
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- Citation_Information:
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- Originator: Nadine E. Golden
- Publication_Date: 2014
- Title: California State Waters Map Series Data Catalog
- Geospatial_Data_Presentation_Form: database
- Series_Information:
-
- Series_Name: Data Series
- Issue_Identification: DS 781
- Publication_Information:
-
- Publication_Place: Reston, VA
- Publisher: U.S. Geological Survey
- Online_Linkage: https://pubs.usgs.gov/ds/781/
- Online_Linkage:
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https://www.sciencebase.gov/arcgis/rest/services/Catalog/555cdb07e4b0a92fa7eb81c5/MapServer
- Online_Linkage:
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https://www.sciencebase.gov/arcgis/services/Catalog/555cdb07e4b0a92fa7eb81c5/MapServer/WMSServer?request=GetCapabilities&service=WMS
- Description:
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- Abstract:
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This part of DS 781 presents data for folds for the geologic and geomorphic map of the Offshore of Fort Ross map area, California. The vector data file is included in "Folds_OffshoreFortRoss.zip," which is accessible from https://pubs.usgs.gov/ds/781/OffshoreFortRoss/data_catalog_OffshoreFortRoss.html.
The Offshore of Fort Ross map area is cut by the northwest-trending San Andreas Fault, the right-lateral transform boundary between the North American and Pacific tectonic plates. The San Andreas extends across the inner shelf in the southern part of the map, then crosses the shoreline at Fort Ross and continues onland for about 75 km to the east flank of Point Arena (fig. 8-1). Seismic-reflection data are used to map the offshore fault trace, and reveal a relatively simple, 200- to 500-m wide zone typically characterized by one or two primary strands. About 1500 m west of the San Andreas Fault, the mid shelf (between water depths of 40 m and 70 m) in the southernmost part of the map area includes an about 5-km-wide field of elongate, shore-normal sediment lobes (unit Qmsl). Individual lobes within the field are as much as 650-m long and 200-m wide, have as much as 1.5 m (check with Steve) of relief above the surrounding smooth seafloor, and are commonly connected with upslope chutes. Given their morphology and proxmity to the San Andreas fault, we infer that these lobes result from slope failures associated with strong ground motions triggered by large San Andreas earthquakes.
Movement on the San Andreas has juxtaposed different coastal bedrock blocks (Blake and others, 2002). Rocks east of the fault that occur along the coast and in the nearshore belong to the late Tertiary, Cretaceous, and Jurassic Franciscan Complex, either sandstone of the Coastal Belt or Central Belt (unit TKfs) or melange of the central terrane (unit fsr). Bedrock west of the fault are considered part of the Gualala Block (Elder, 1998) and include the Eocene and Paleocene German Rancho Formation (unit Tgr) and the Miocene sandstone and mudstone of the Fort Ross area (unit Tsm).
This section of the San Andreas Fault onland has an estimated slip rate of about 17 to 25 mm/yr (Bryant and Lundberg, 2002). The devastating Great 1906 California earthquake (M 7.8) is thought to have nucleated on the San Andreas Fault about 100 kilometers south of this map area offshore of San Francisco (e.g., Bolt, 1968; Lomax, 2005), with the rupture extending northward through the Offshore of Fort Ross map area to the south flank of Cape Mendocino. Emergent marine terraces along the coast in the Offshore of Fort Ross map area record recent contractional deformation associated with the San Andreas Fault system. Prentice and Kelson (2006) report uplift rates of 0.3 to 0.6 mm/yr for a late Pleistocene terrace exposed at Fort Ross, and this recent uplift must also have affect the nearshore and inner shelf.
Previously, McCulloch (1987) mapped a nearshore (within 3 to 5 km of the coast) fault zone from Point Arena to Fort Ross (Fig. 8-1) using primarily deeper industry seismic-reflection data. Subsequently, Dickinson and others (2005) named this structure the "Gualala Fault." Our mapping, also based on seismic-reflection data, reveals this structure as a steep, northeast trending fault and similarly shows the fault ending to the south in the northern part of the Offshore of Fort Ross map area. We have designated the zone of faulting and folding above this structure the "Gualala Fault deformation zone."
Folds were primarily mapped by interpretation of seismic reflection profile data (see field activity S-8-09-NC). The seismic reflection profiles were collected between 2007 and 2010.
References Cited
Blake, M.C., Jr., Graymer, R.W., and Stamski, R.E., 2002, Geologic map and map database of western Sonoma, northernmost Marin, and southernmost Mendocino counties, California: U.S. Geological Survey Miscellaneous Field Studies Map 2402, scale 1:100,000.
Bolt, B.A., 1968, The focus of the 1906 California earthquake: Bulletin of the Seismological Society of America, v. 58, p. 457-471.
Bryant, W.A., and Lundberg, M.M., compilers, 2002, Fault number 1b, San Andreas fault zone, North Coast section, in Quaternary fault and fold database of the United States: U.S. Geological Survey website, accessed April 4, 2013, at http://earthquakes.usgs.gov/hazards/qfaults.
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.
Elder, W.P., ed., 1998, Geology and tectonics of the Gualala Block, northern California: Pacific Section, Society of Economic Paleontologists and Mineralogists, Book 84, 222 p.
Lomax, A., 2005, A reanalysis of the hypocentral location and related observations for the Great 1906 California earthquake: Bulletin of the Seismological Society of America, v. 95, p. 861-877.
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.
Prentice, C.S., and Kelson, K.I., 2006, The San Andreas fault in Sonoma and Mendocino counties, in Prentice, C.S., Scotchmoor, J.G., Moores, E.M., and Kiland, J.P., eds., 1906 San Francisco Earthquake Centennial Field Guides: Field trips associated with the 100th Anniversary Conference, 18-23 April 2006, San Francisco, California: Geological Society of America Field Guide 7, p. 127-156.
- Purpose:
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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 Fort Ross 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.
- Supplemental_Information:
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Map political location: San Mateo County, California
Compilation scale: 1:24,000
Base maps used are hillshades generated from IfSAR, LiDAR, and multibeam
mapping both onshore and offshore (see Bathymetry--Offshore of Fort Ross Map Area, California).
- Time_Period_of_Content:
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- Time_Period_Information:
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- Range_of_Dates/Times:
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- Beginning_Date: 2009
- Ending_Date: 2009
- Currentness_Reference: ground condition
- Status:
-
- Progress: Complete
- Maintenance_and_Update_Frequency: none planned
- Spatial_Domain:
-
- Bounding_Coordinates:
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- West_Bounding_Coordinate: -123.30
- East_Bounding_Coordinate: -123.18
- North_Bounding_Coordinate: 38.52
- South_Bounding_Coordinate: 38.47
- Keywords:
-
- Theme:
-
- Theme_Keyword_Thesaurus: Global Change Master Directory (GCMD)
- Theme_Keyword: Oceans > Bathymetry/SeafloorTopography > Bathymetry
- Theme_Keyword: Oceans > Bathymetry/SeafloorTopography > Seafloor Topography
- Theme:
-
- Theme_Keyword_Thesaurus: ISO 19115 Topic Category
- Theme_Keyword: geoscientificInformation
- Theme_Keyword: environment
- Theme_Keyword: oceans
- Theme_Keyword: imageryBaseMapsEarthCover
- Place:
-
- Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
- Place_Keyword: Pacific Ocean
- Place_Keyword: State of California
- Place_Keyword: Fort Ross
- Place_Keyword: Jenner
- Place_Keyword: Russian River
- Access_Constraints:
-
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
- Use_Constraints:
-
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.
- Point_of_Contact:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization: USGS Pacific Coastal and Marine Science Center
- Contact_Person: Stephen Hartwell
- Contact_Position: Geologist
- Contact_Address:
-
- Address_Type: physical address
- Address: 400 Natural Bridges Drive
- City: Santa Cruz
- State_or_Province: CA
- Postal_Code: 95060
- Country: USA
- Contact_Voice_Telephone: (831) 460-7814
- Contact_Facsimile_Telephone: (831) 427-4748
- Contact_Electronic_Mail_Address: shartwell@usgs.gov
- Native_Data_Set_Environment:
-
Microsoft Windows Server 2008 R2 Version 6.1 (Build 7601) Service Pack 1; ESRI ArcGIS 10.0.0.2414
- Browse_Graphic:
-
- Browse_Graphic_File_Name:
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<https://pubs.usgs.gov/ds/781/OffshoreFortRoss/images/Folds_OffshoreFortRoss.jpg>
- Browse_Graphic_File_Description: Folds offshore Fort Ross.
- Browse_Graphic_File_Type: JPEG
- Data_Quality_Information:
-
- Logical_Consistency_Report:
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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.
- Completeness_Report:
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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.
- Positional_Accuracy:
-
- Horizontal_Positional_Accuracy:
-
- Horizontal_Positional_Accuracy_Report:
-
Folds were primarily mapped by interpretation of seismic reflection profile data (see field activity S-8-09-NC).
Folds 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.
- Lineage:
-
- Source_Information:
-
- Source_Citation:
-
- Citation_Information:
-
- Originator:
-
U.S. Geological Survey (USGS) , Coastal and Marine Geology Program (CMGP)
- Publication_Date: 2013
- Title:
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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
- Publication_Information:
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- Publication_Place: Menlo Park, CA
- Publisher:
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U.S. Geological Survey (USGS) , Coastal and Marine Geology (CMG)
- Online_Linkage: http://walrus.wr.usgs.gov/infobank/gos/s-8-09-nc.fmeta.xml
- Online_Linkage:
-
http://walrus.wr.usgs.gov/infobank/s/s809nc/html/s-8-09-nc.meta.html
- Type_of_Source_Media: ASCII lat/long shot point files
- Source_Time_Period_of_Content:
-
- Time_Period_Information:
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- Range_of_Dates/Times:
-
- Beginning_Date: 20090908
- Ending_Date: 20090930
- Source_Currentness_Reference: ground condition
- Source_Citation_Abbreviation: S-8-09-NC
- Source_Contribution:
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Digital seismic data used to interpret subsurface geologic structure
- Process_Step:
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- Process_Description:
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Folds were mapped onto shot lines based on the latitude and longitude of seismic picks from field activity
S-8-09-NC.
- Process_Date: 2013
- Spatial_Data_Organization_Information:
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- Direct_Spatial_Reference_Method: Vector
- Point_and_Vector_Object_Information:
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- SDTS_Terms_Description:
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- SDTS_Point_and_Vector_Object_Type: String
- Point_and_Vector_Object_Count: 8
- Spatial_Reference_Information:
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- Horizontal_Coordinate_System_Definition:
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- Planar:
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- Map_Projection:
-
- Map_Projection_Name: WGS 1984 UTM Zone 10N
- Transverse_Mercator:
-
- Scale_Factor_at_Central_Meridian: 0.9996
- Longitude_of_Central_Meridian: -123.0
- Latitude_of_Projection_Origin: 0.0
- False_Easting: 500000.0
- False_Northing: 0.0
- Planar_Coordinate_Information:
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- Planar_Coordinate_Encoding_Method: coordinate pair
- Coordinate_Representation:
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- Abscissa_Resolution: 0.0001
- Ordinate_Resolution: 0.0001
- Planar_Distance_Units: Meter
- Geodetic_Model:
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- Horizontal_Datum_Name: D WGS 1984
- Ellipsoid_Name: WGS 1984
- Semi-major_Axis: 6378137.0
- Denominator_of_Flattening_Ratio: 298.257223563
- Entity_and_Attribute_Information:
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- Detailed_Description:
-
- Entity_Type:
-
- Entity_Type_Label: Folds
- Entity_Type_Definition: lines representing mapped folds
- Entity_Type_Definition_Source: This report
- Attribute:
-
- Attribute_Label: FID
- Attribute_Definition: Internal feature number.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
-
- Unrepresentable_Domain:
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Sequential unique whole numbers that are automatically generated.
- Attribute:
-
- Attribute_Label: Shape
- Attribute_Definition: Feature geometry.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
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- Unrepresentable_Domain: Coordinates defining the features.
- Attribute:
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- Attribute_Label: FGDCRefNo
- Attribute_Definition:
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FGDC Digital Cartographic Standard for geologic map symbolization
- Attribute_Definition_Source: This report
- Attribute_Domain_Values:
-
- Unrepresentable_Domain:
-
text field containing the reference number for the FGDC Digital Cartographic Standard for geologic map symbolization
- Attribute:
-
- Attribute_Label: Shape_Leng
- Attribute_Definition: Length of feature in internal units.
- Attribute_Definition_Source: ESRI
- Attribute_Domain_Values:
-
- Unrepresentable_Domain: Positive real numbers that are automatically generated.
- Metadata_Reference_Information:
-
- Metadata_Date: 2013
- Metadata_Review_Date: 20140922
- Metadata_Contact:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization: U.S. Geological Survey, Coastal and Marine Geology Program
- Contact_Person: Stephen R. Hartwell
- Contact_Address:
-
- Address_Type: mailing and physical address
- Address: 400 Natural Bridges Drive
- City: Santa Cruz
- State_or_Province: CA
- Postal_Code: 95060-5792
- Country: US
- Contact_Voice_Telephone: 831-460-7814
- Contact_Facsimile_Telephone: 831-427-4748
- Contact_Electronic_Mail_Address: shartwell@usgs.gov
- Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
- Metadata_Standard_Version: FGDC-STD-001-1998
Generated by mp version 2.9.32 on Mon Nov 23 10:07:31 2015