Metadata: Identification_Information: Citation: Citation_Information: Originator: Knudsen, K.L. Originator: Sowers, J.M. Originator: Witter, R.C. Originator: Wentworth, C.M. Originator: Helley, E.J. Originator: Nicholson, R.S. Originator: Wright, H.M. Originator: Brown, K.M. Publication_Date: 2000 Publication_Time: Title: Preliminary maps of Quaternary deposits and liquefaction susceptibility, nine-county San Francisco Bay region, California: a digital database Edition: 1.0 Geospatial_Data_Presentation_Form: maps and spatial databases Series_Name: U.S. Geological Survey Open File Report Issue_Identification: 00-444 Publication_Information: Publication_Place: Menlo Park, CA Publisher: U.S. Geological Survey Other_Citation_Details: Online_Linkage: http://geopubs.wr.usgs.gov/open-file/of00-444 Description: Abstract: This report presents a preliminary map and database of Quaternary deposits and liquefaction susceptibility for the nine-county San Francisco Bay region, together with a digital compendium of ground effects associated with past earthquakes in the region. The report consists of (1) a spatial database of fivedata layers (Quaternary deposits, quadrangle index, and three ground effects layers) and two text layers (a labels and leaders layer for Quaternary deposits and for ground effects), (2) two small-scale colored maps (Quaternary deposits and liquefaction susceptibility), (3) a text describing the Quaternary map, liquefaction interpretation, and the ground effects compendium, and (4) the databse description pamphlet. The nine counties surrounding San Francisco Bay straddle the San Andreas fault system, which exposes the region to serious earthquake hazard (Working Group on California Earthquake Probabilities, 1999). Much of the land adjacent to the Bay and the major rivers and streams is underlain by unconsolidated deposits that are particularly vulnerable to earthquake shaking and liquefaction of water-saturated granular sediment. This new map provides a modern and regionally consistent treatment of Quaternary surficial deposits that builds on the pioneering mapping of Helley and Lajoie (Helley and others, 1979) and such intervening work as Atwater (1982), Helley and others (1994), and Helley and Graymer (1997a and b). Like these earlier studies, the current mapping uses geomorphic expression, pedogenic soils, and inferred depositional environments to define and distinguish the map units. In contrast to the twelve map units of Helley and Lajoie, however, this new map uses a complex stratigraphy of some forty units, which permits a more realistic portrayal of the Quaternary depositional system. The two colored maps provide a regional summary of the new mapping at a scale of 1:275,000, a scale that is sufficient to show the general distribution and relationships of the map units but cannot distinguish the more detailed elements that are present in the database. The report is the product of years of cooperative work by the USGS National Earthquake Hazards Reduction Program (NEHRP) and National Cooperative Geologic Mapping Program, William Lettis and & Associates, Inc. (WLA) and, more recently, by the California Division of Mines and Geology as well. An earlier version was submitted to the Geological Survey by WLA as a final report for a NEHRP grant (Knudsen and others, 2000). The mapping has been carried out by WLA geologists under contract to the NEHRP Earthquake Program (Grants #14-08-0001-G2129, 1434-94-G-2499, 1434-HQ-97-GR-03121, and 99-HQ-GR-0095) and with other limited support from the County of Napa, and recently also by the California Division of Mines and Geology. The current map consists of this new mapping and revisions of previous USGS mapping. Purpose: Map delineation of the different types and ages of Quaternary deposits supports evaluation of susceptibility to liquefaction, the immediate application of the work, but serves many other purposes as well. It provides a framework for interpreting the architecture and history of the Quaternary sedimentary basins, which is used in estimating earthquake shaking and modeling the groundwater system. The mapping is also useful in constraining the ages and histories of offsetting faults, in guiding geotechnical investigations, and in other engineering, geologic, and archeological applications. Supplemental_Information: Procedures_Used: The databases in this report were compiled in ARC/INFO, a commercial Geographic Information System (Environmental Systems Research Institute, Redlands, California), with version 3.0 of the menu interface ALACARTE (Fitzgibbon and Wentworth, 1991, Fitzgibbon, 1991, Wentworth and Fitzgibbon, 1991). The files are in both uncompressed ARC export format (ARC/INFO version 7.x) and Arc View Shape format. The digital compilation was done in versions 7.x of ARC/INFO with version 3.x of the menu interface ALACARTE (Fitzgibbon and Wentworth, 1991, Fitzgibbon, 1991, Wentworth and Fitzgibbon, 1991). The Quaternary map information was digitized from stable originals of the geologic maps at 1:24,000 and 1:100,000 scales. The author manuscripts were scanned using a Altek monochrome scanner with a resolution of 400 dots per inch. The scanned images were vectorized and transformed from scanner coordinates to projection coordinates in ARC/INFO with digital tics placed at quadrangle corners. The scanned lines were edited interactively by hand using ALACARTE, and unit boundaries were tagged as appropriate. Revisions: This is version 1.0 of the report. There have been no revisions to any part of the report. See the ASCII text file of00-444_2a.txt (revision list) for more information about revisions. Reviews_Applied_to_Data: This report has undergone two scientific peer reviews, one digital database review, and review of the digital files for functionality. Related_Spatial_and_Tabular_Data_Sets: This report presents a preliminary map and database of Quaternary deposits and liquefaction susceptibility for the nine-county San Francisco Bay region, together with a digital compendium of ground effects associated with past earthquakes in the region. The report consists of (1) a spatial database of five data layers (Quaternary deposits, quadrangle index, and three ground effects layers) and two text layers (a labels and leaders layer for Quaternary deposits and for ground effects), (2) two small-scale colored maps (Quaternary deposits and liquefaction susceptibility), (3) a text describing the Quaternary map, liquefaction interpretation, and the ground effects compendium, and (4) the database description pamphlet. See the revision list (of00-444_2x) or Open-File pamphlet (of00-444_1x) for further details. Other_References_Cited: Other references cited are listed in the explanatory pamphlets (of00-444_1x and of00-444_3x) Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 20001201 Currentness_Reference: The date given is the publication date. The information in the report was current at the time of publication. Status: Progress: Released Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -121.125 East_Bounding_Coordinate: -123.625 North_Bounding_Coordinate: 38.866667 South_Bounding_Coordinate: 36.866667 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Quaternary surficial deposits Theme_Keyword: Liquefaction susceptibility Theme_Keyword: Liquefaction Theme_Keyword: Earthquake ground effects Theme_Keyword: Earthquake ground failures Theme_Keyword: Digital spatial database Theme_Keyword: Vector data Theme_Keyword: Soils Place: Place_Keyword_Thesaurus: None Place_Keyword: United States of America Place_Keyword: California Place_Keyword: Solano County Place_Keyword: San Francisco County Place_Keyword: Sonoma County Place_Keyword: Marin County Place_Keyword: Napa County Place_Keyword: Contra Costa County Place_Keyword: Alameda County Place_Keyword: San Mateo County Place_Keyword: Santa Clara County Place_Keyword: San Francisco Bay Region Place_Keyword: San Francisco Bay Area Stratum: Stratum_Keyword_Thesaurus: ARC/INFO file SF_QUAT.UN Stratum_Keyword: Artificial fill Stratum_Keyword: Artificial fill over San Francisco Bay Mud Stratum_Keyword: Dredge spoils Stratum_Keyword: Gravel quarry Stratum_Keyword: Artificial stream channel Stratum_Keyword: Modern stream channel deposits Stratum_Keyword: Alluvial fan deposits Stratum_Keyword: Alluvial fan levee deposits Stratum_Keyword: Stream terrace deposits Stratum_Keyword: Alluvial deposits Stratum_Keyword: Alluvial floodplain deposits Stratum_Keyword: Flood basin deposits Stratum_Keyword: Dune sand Stratum_Keyword: Beach sand Stratum_Keyword: San Francisco Bay Mud Stratum_Keyword: Basin deposits Stratum_Keyword: Alluvial fan-estuarine complex deposits Stratum_Keyword: Alluvial fan deposits, fine facies Stratum_Keyword: Alluvium, undifferentiated Stratum_Keyword: Marine terrace deposits Stratum_Keyword: Pediment deposits Stratum_Keyword: Bedrock Temporal: Temporal_Keyword_Thesaurus: None Temporal_Keyword: Quaternary Temporal_Keyword: Pleistocene Temporal_Keyword: Holocene Access_Constraints: None Use_Constraints: Use is limited by the 1:24,000 - 1:100,000 scale spatial resolution of the data. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: USGS Earthquake Hazards Team Contact_Person: Steve Walter Contact_Address: Address_Type: mailing address Address: 345 Middlefield Road, MS 977 City: Menlo Park State_or_Province: CA Postal_Code: 94025 Country: USA Browse_Graphic: None Browse_Graphic_File_Name: Browse_Graphic_File_Description: Browse_Graphic_File_Type: Data_Set_Credit: Geology by Keith L. Knudsen, Janet M. Sowers, Robert C. Witter, Carl M. Wentworth and Edward J. Helley. Digital database by Carl M. Wentworth, Robert S. Nicholson, Heather M. Wright, and Katherine M. Brown Security_Information: Security_Classification_System: None Security_Classification: Unclassified Security_Handling_Description: None Native_Data_Set_Environment: Solaris 6 and 7, UNIX, Microsoft Word, Microsoft Excel, Acrobat Distiller, ARC/INFO version 7.x, UNIX texteditor Cross_Reference: Citation_Information: Originator: Publication_Date: Title: Geospatial_Data_Presentation_Form: Series_Information Series_Name: Issue_Identification: Other_Citation_Details: Online_Linkage: Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: See Entity_Attribute_Information Quantitative_Attribute_Accuracy_Assessment: Attribute_Accuracy_Value: See Explanation Attribute_Accuracy_Explanation: Attribute accuracy is described, where present, with each attribute defined in the Entity and Attribute Section. Logical_Consistency_Report: Polygon and chain-node topology present Completeness_Report: The report describes the Quaternary geology of the map area at 1:24,000 - 1:100,000 scale; map graphics at 1:275,000 scale. See Open-File pamphlet of00-444_1x. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Lineage: See explanatory pamphlets of00-444_1x and of00-444_3x. Source_Information: Source_Citation: Citation_Information: Originator: Publication_Date: Title: Series_Information: Series_Name: Issue_Identification: Source_Scale_Denominator: Type_Of_Source_Media: Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: Source_Currentness_Reference: Source_Citation_Abbreviation: Source_Contribution: Process_Step: Process_Description: Geologic linework was scanned, converted to vector data, and edited on-screen to repair errors visible at map scale. Polygon topology was created and each polygon tagged on-screen. Plotfiles were created in ArcPlot. 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Attribute_Definition_Source: author Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: contact, approx. located Enumerated_Domain_Value_Definition: depositional contact, location uncertainty greater than about +/- 100 m Enumerated_Domain_Value_Definition_Source: author Enumerated_Domain: Enumerated_Domain_Value: contact, well located Enumerated_Domain_Value_Definition: depositional contact, location uncertainty less than about +/- 100 m Enumerated_Domain_Value_Definition_Source: author Enumerated_Domain: Enumerated_Domain_Value: contact, concealed Enumerated_Domain_Value_Definition: depositional contact concealed beaneath water, fill, or levee Enumerated_Domain_Value_Definition_Source: author Enumerated_Domain: Enumerated_Domain_Value: county line Enumerated_Domain_Value_Definition: Boundary of nine-county region, from 1:24,000 USGS DLGs and published paper topographic maps Enumerated_Domain_Value_Definition_Source: author Enumerated_Domain: Enumerated_Domain_Value: map boundary Enumerated_Domain_Value_Definition: Exterior boundary of 1:24,000 quadrangles composing the map area Enumerated_Domain: Enumerated_Domain_Value: scratch boundary Enumerated_Domain_Value_Definition: Boundary without geologic attribute, here connecting mismatch of contacts or units at 7.5-minute quadrangle boundary Enumerated_Domain_Value_Definition_Source: author Enumerated_Domain: Enumerated_Domain_Value: water boundary Enumerated_Domain_Value_Definition: Boundary of open water from 1:24,000 USGS DLGs and published paper topographic maps Enumerated_Domain_Value_Definition_Source: author Enumerated_Domain: Enumerated_Domain_Value: water boundary, 1800s Enumerated_Domain_Value_Definition: Landward margin of tidal marsh bordering San Francisco Bay in the late 19th century, mainly from Nichols and Wright, 1971 Enumerated_Domain_Value_Definition_Source: author Overview_Description: Entity_and_Attribute_Overview: The databases in this report were compiled in ARC/INFO, a commercial Geographic Information System (Environmental Systems Research Institute, Redlands, California). Almost all the attributes in the various attribute tables of the coverages included in the report are set or calculated by Arc/Info. The exceptions are "coveragename"-ID, LTYPE, PTYPE, and LIQ. "coveragename"-ID is set equal to the sequential # ID integers. LTYPE and PTYPE are author-added items to the coverage AAT or PAT that are used to describe the type of line (LTYPE), or area (PTYPE). Each of these items has WIDTH 35, OUTPUT 35, TYPE C. LIQ is an author-added item that records liquefaction susceptibility ratings for Quaternary polygons. It has WIDTH 8, OUTPUT 8, TYPE C. LIQ-SOURCE is an author-added item that records custom liquefaction assignments for Quaternary polygons. It has WIDTH 1, OUTPUT 1, TYPE I. Entity_and_Attribute_Detail_Citation: This report combined with the explanatory pamphlet or pamphlets: of00-444_1, of00-444_2 and of00-444_3. Distribution_Information: Distributor: U.S. Geological Survey Contact_Information: Digital Form Contact_Person_Primary: Contact_Person: Database Coordinator Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: web address Address: http://geopubs.wr.usgs.gov/open-file/of00-444 Contact_Instructions: Please contact through http://geopubs.wr.usgs.gov/open-file/of00-444. Resource_Description: This report presents a preliminary map and database of Quaternary deposits and liquefaction susceptibility for the nine-county San Francisco Bay region, together with a digital compendium of ground effects associated with past earthquakes in the region. The report consists of (1) a spatial database of fivedata layers (Quaternary deposits, quadrangle index, and three ground effects layers) and two text layers (a labels and leaders layer for Quaternary depositsand for ground effects), (2) two small-scale colored maps (Quaternary deposits and liquefaction susceptibility), (3) a text describing the Quaternary map, liquefaction interpretation, and the ground effects compendium, and (4) the database description pamphlet. Distribution_Liability: This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: PostScript plotfile package, of00-444_10a.ps.gz Format_Version_Number: 1.0 Format_Version_Date: 20001201 Format_Specification: PostScript files generated by Arc/Info v. 7.x Format_Information_Content: 4 PostScript plotfiles, one each for the Quaternary geology map, the liquefaction map, the Open-File pamphlet, and the Description of Mapping. File_Decompression_Technique: TAR and gzip Transfer_Size: see the Open-File pamphlet (of00-444_1x) Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://geopubs.wr.usgs.gov/open-file/of00-444 Offline_Option: print-on-demand Offline_media: Digital_Form: Digital_Transfer_Information: Format_Name: PDF plotfile package, of00-444_10b.pdf Format_Version_Number: 1.0 Format_Version_Date: 2000 Format_Specification: Adobe Acrobat PDF files, v. 3.0 Format_Information_Content: 4 PDF (Adobe Acrobat) plotfiles, one each for the Quaternary geology map, the liquefaction map, the Open-File pamphlet, and the Description of Mapping. File_Decompression_Technique: TAR and gzip Transfer_Size: Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://geopubs.wr.usgs.gov/open-file/of00-444 Offline_Option: none Digital_Form: Digital_Transfer_Information: Format_Name: Digital Database package, of00-444_9a.tar.gz Format_Version_Number: 1.0 Format_Version_Date: 1999 Format_Specification: Arc/Info v. 7.2.1 Format_Information_Content: 18 Arc/Info export (.e00) files, along with supporting pamphlet plotfiles, revisions list, and import AML. See the Open-File pamphlet (of00-444_1a.txt) for more information about the content of the digital database. File_Decompression_Technique: TAR and gzip Transfer_Size: Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://geopubs.wr.usgs.gov/open-file/of00-444 Offline_Option: none Ordering_Instructions: Digital files (both plotfiles and database files) can be obtained on-line as described above at the publication web-site. Digital_Form: Digital_Transfer_Information: Format_Name: Digital Database package, of00-444_9b.tar.gz Format_Version_Number: 1.0 Format_Version_Date: 1999 Format_Specification: Arc/Info v. 7.2.1 Format_Information_Content: 18 Arc View shape files, along with supporting pamphlet plotfiles, and revisions list. See the Open-File pamphlet (of00-444_1a.txt) for more information about the content of the digital database. File_Decompression_Technique: TAR and gzip Transfer_Size: Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://geopubs.wr.usgs.gov/open-file/of00-444 Offline_Option: none Ordering_Instructions: Digital files (both plotfiles and database files) can be obtained on-line as described above at the publication web-site. Distributor: U.S. Geological Survey Contact_Information: Non-Digital Form Contact_Organization_Primary: Contact_Organization: USGS Information Services Contact_Address: Address_Type: mailing address Address: Box 25286, Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: (888) 275-8747 Contact_Facsimile_Telephone: Contact_Electronic_Mail_Address: infoservices@usgs.gov Hours_of_Service: Contact_Instructions: Resource_Description: USGS Open-File Report OF00-444 consists of both traditional geologic map products and Arc/Info format geospatial databases. Furthermore, the traditional geologic map products (map sheets) can be obtained either as paper or as digital plot files. Distribution_Liability: This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Standard_Order_Process: Non-digital_Form: Paper copies of the map sheets can be obtained by contacting USGS Information Services via the contact information listed above. Fees: Plotting fees are set by USGS Information Services, and may be obtained by contacting them via the contact information given above. Ordering_Instructions: Paper copies of the map sheets and pamphlet can be obtained by contacting USGS Information Services via the contact information listed above. Metadata_Reference_Information: Metadata_Date: Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: C.M. Wentworth Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: Mailing Address: 345 Middlefield Rd., MS 977 City: Menlo Park State_or_Province: CA Postal_Code: 94025 Country: USA Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: 19940608 Metadata_Time_Convention: Local Time Metadata_Security_Information: Metadata_Security_Classification_System: None Metadata_Security_Classification: Unclassified Metadata_Security_Handling_Description: None