Witter, R.C. 1 Knudsen, K.L. 2 Sowers, J.M. 1 Wentworth, C.M. 3 Koehler, R.D. 1 Randolph, C.E. 1 2006 LiquefactionSusceptibility 1.0 vector digital data Menlo Park, CA U.S. Geological Survey 1 - Wm. Lettis & Assoc., Inc. 2 - California Geological Survey 3 - U.S. Geological Survey http://pubs.usgs.gov/of/2006/1037/ haz_USGS_LiquefactionSusceptibility This report presents a map and database of Quaternary deposits and liquefaction susceptibility for the urban core of the San Francisco Bay region. It supercedes the equivalent area of U.S. Geological Survey Open-File Report 00-444 (Knudsen and others, 2000), which covers the larger 9-county San Francisco Bay region. The report consists of (1) a spatial database, (2) two small-scale colored maps (Quaternary deposits and liquefaction susceptibility), (3) a text describing the Quaternary map and liquefaction interpretation (part 3), and (4) a text introducing the report and describing the database (part 1). All parts of the report are digital; part 1 describes the database and digital files and how to obtain them by downloading across the internet. 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 consistent detailed treatment of the central part of the 9-county region in which much of the mapping of Open-File Report 00-444 was either at smaller (less detailed) scale or represented only preliminary revision of earlier work. Like Open-File Report 00-444, the current mapping uses geomorphic expression, pedogenic soils, inferred depositional environments, and geologic age to define and distinguish the map units. Further scrutiny of the factors controlling liquefaction susceptibility has led to some changes relative to Open-File Report 00-444: particularly the reclassification of San Francisco Bay mud (Qhbm) to have only MODERATE susceptibility and the rating of artificial fills according to the Quaternary map units inferred to underlie them (other than dams ? adf). The two colored maps provide a regional summary of the new mapping at a scale of 1:200,000, a scale that is sufficient to show the general distribution and relationships of the map units but not to distinguish the more detailed elements that are present in the database. The report is the product of cooperative work by the National Earthquake Hazards Reduction Program (NEHRP) and National Cooperative Geologic Mapping Program of the U.S. Geological Survey, William Lettis and & Associates, Inc. (WLA), and the California Geological Survey. An earlier version was submitted to the U.S. Geological Survey by WLA as a final report for a NEHRP grant (Witter and others, 2005). The mapping has been carried out by WLA geologists under contract to the NEHRP Earthquake Program (Grant 99-HQ-GR-0095) and by the California Geological Survey.For detailed information about the map the USGS has an open report, "Maps of Quaternary Deposits and Liquefaction Susceptibility in the Central San Francisco Bay Region, California. U.S. Geological Survey Open File Report 2006-1037 Version 1.1. http://pubs.usgs.gov/of/2006/1037/ 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. Procedures_Used: The databases in this report were compiled in ARC/INFO, 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 scale. The author manuscripts were scanned at 300 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 of06-1037_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 map and database of Quaternary deposits and liquefaction susceptibility for the central San Francisco Bay region. The report consists of (1) a spatial database of one data layer (Quaternary deposits), (2) two small-scale colored maps (Quaternary deposits and liquefaction susceptibility), (3) a text describing the Quaternary map and liquefaction interpretation, and (4) the database description pamphlet. See the revision list (of06-1037_2x) or Open-File pamphlet (of06-1037_1x) for further details. Other_References_Cited: Other references cited are listed in the explanatory pamphlets (of06-1037_1 and of06-1037_3) (ABAG SUPPLEMENTAL INFORMATION) This dataset represents the entire San Francsico Bay Area by combining both Open-File Report 00-444 and Open-File Report 2006-1037. The area covered by Open-File Report 2006-1037 was erased from Open-File Report 00-444 and the two datasets were merged. A column has been added to the data table to label which report each polygon was originally from. Other than this supplemental information paragraph, all the metadata is from Open-File Report 2006-1037. en 20060215 The date given is the publication date. The information in the report was current at the time of publication. Released As needed -123.534266 -121.164124 38.865812 36.888416 453648.811600 659309.653300 4083986.263500 4301885.736400 None Quaternary surficial deposits Liquefaction susceptibility Liquefaction Earthquake ground effects Earthquake ground failures Digital spatial database Vector data Soils None United States of America California Solano County San Francisco County Sonoma County Marin County Napa County Contra Costa County Alameda County San Mateo County Santa Clara County San Francisco Bay Region San Francisco Bay Area central San Francisco Bay Region None Artificial fill Artificial fill over San Francisco Bay Mud Dredge spoils Gravel quarry Artificial stream channel Modern stream channel deposits Alluvial fan deposits Alluvial fan levee deposits Stream terrace deposits Alluvial deposits Alluvial floodplain deposits Flood basin deposits Dune sand Beach sand San Francisco Bay Mud Basin deposits Alluvial fan-estuarine complex deposits Alluvial fan deposits, fine facies Alluvium, undifferentiated Marine terrace deposits Pediment deposits Bedrock None Quaternary Pleistocene latest Pleistocene Holocene None Use is limited by the 1:24,000 scale spatial resolution of the data. USGS Western Earth Surface Processes Team Todd Fitzgibbon mailing address
345 Middlefield Road, MS 973
Menlo Park CA 94025 USA Geology by Robert C. Witter, Keith L. Knudsen, Janet M. Sowers, Carl M. Wentworth, Richard D. Koehler, and Carolyn E. Randolph. Digital database by Carl M. Wentworth, Suzanna K. Brooks, and Kathleen D. Gans None Unclassified None ESRI ArcCatalog 9.3.1.3500 Shapefile See Entity_Attribute_Information See Explanation Attribute accuracy is described, where present, with each attribute defined in the Entity and Attribute Section. Polygon and chain-node topology present The report describes the Quaternary geology of the map area at 1:24,000 scale; map graphics at 1:200,000 scale. See Open-File pamphlet of06-1037_1. 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. Metadata imported. withheld Metadata imported. withheld Metadata imported. withheld 20090608 17140400 Dataset copied. withheld 20110104 13271600 Vector Simple FALSE 0 TRUE FALSE coordinate pair 0.000000 0.000000 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 GCS_North_American_1983 NAD_1983_UTM_Zone_10N Explicit elevation coordinate included with horizontal coordinates 1.000000 LiquefactionSusceptibility Attribute table of SF-QUAT2.PAT. ARC/INFO Feature Class 0 OBJECTID_1 FID OID 4 10 0 Internal feature number. Esri Sequential unique whole numbers that are automatically generated. objectid objectid Integer 4 10 0 Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Shape Geometry 4 0 0 Feature geometry. ESRI Coordinates defining the features. PTYPE Geologic unit label author ac Artificial stream channel (historical) author acf Artificial channel fill (historical) author adf Artificial dam fill (historical) author af Artificial fill (historical) author afem Artificial fill over estuarine mud (historical) author alf Artificial levee fill (historical) author br pre-Quaternary deposits and bedrock author br? pre-Quaternary deposits and bedrock (queried) author gq Gravel quarries and percolation ponds author H2O open water author nm not mapped author Qa Latest Pleistocene to Holocene alluvium undifferentiated author Qa? Latest Pleistocene to Holocene alluvium undifferentiated (queried) author Qb Latest Pleistocene to Holocene basin deposits author Qbt Pleistocene bay terrace deposits author Qbt? Pleistocene bay terrace deposits (queried) author Qds Latest Pleistocene to Holocene dune sand author Qf Latest Pleistocene to Holocenealluvial fan deposits author Qha Holocene alluvium undifferentiated author Qha? Holocene alluvium undifferentiated (queried) author Qhay Latest Holocene alluvial deposits Undifferentiated author Qhb Holocene basin deposits author Qhbm Holocene San Francisco Bay Mud author Qhbs Latest Holocene beach sand author Qhc Modern stream channel deposits author Qhds Holocene dune sand author Qhed Holocene estuarine delta deposits author Qhf Holocene alluvial fan deposits author Qhf? Holocene alluvial fan deposits (queried) author Qhf1 Younger Holocene alluvial fan deposits author Qhf2 Older Holocene alluvial fan deposits author Qhf3 Oldest Holocene alluvial fan deposits author Qhfe Holocene alluvial fan-estuarine complex deposits author Qhff Holocene alluvial fan deposits fine facies author Qhfy Latest Holocene alluvial fan deposits author Qhl Holocene alluvial fan levee deposits author Qhl1 Younger Holocene alluvial fan levee deposits author Qhl2 Older Holocene alluvial fan levee deposits author Qhl3 Oldest Holocene alluvial fan levee deposits author Qhly Latest Holocene alluvial fan levee deposits author Qht Holocene stream terrace deposits author Qht1 Younger Holocene stream terrace deposits author Qht2 Older Holocene stream terrace deposits author Qhty Latest Holocene stream terrace deposits author Qhty? Latest Holocene stream terrace deposits (queried) author Qhty1 Younger latest Holocene stream terrace deposits author Qhty2 Older latest Holocene stream terrace deposits author Qmt Pleistocene marine terrace deposits author Qmt? Pleistocene marine terrace deposits (queried) author Qmt1 Youngest (of 4) Pleistocene marine terrace deposits author Qmt2 Second youngest (of 4) Pleistocene marine terrace deposits author Qmt2? Second youngest (of 4) Pleistocene marine terrace deposits (queried) author Qmt3 Second oldest (of 4) Pleistocene marine terrace deposits author Qmt4 Oldest (of 4) Pleistocene marine terrace Deposits author Qmt4? Oldest (of 4) Pleistocene marine terrace Deposits (queried) author Qoa Early to late Pleistocene alluvial deposits undifferentiated author Qoa? Early to late Pleistocene alluvial deposits undifferentiated (queried) author Qoa1 Younger early to late Pleistocene alluvial deposits undifferentiated author Qoa2 Older early to late Pleistocene alluvial deposits undifferentiated author Qof Early to late Pleistocene alluvial fan deposits author Qof? Early to late Pleistocene alluvial fan deposits (queried) author Qop Early to late Pleistocene pediment deposits author Qot Early to late Pleistocene stream terrace deposits author Qot1 Younger early to late Pleistocene alluvial fan deposits author Qot2 Older early to late Pleistocene alluvial fan deposits author Qpa Latest Pleistocenealluvium undifferentiated author Qpa? Latest Pleistocenealluvium undifferentiated (queried) author Qpf Latest Pleistocene alluvial fan deposits author Qpf? Latest Pleistocene alluvial fan deposits (queried) author Qpf1 Younger latest Pleistocene alluvial fan deposits author Qpf2 Older latest Pleistocene alluvial fan deposits author Qpt Latest Pleistocene stream terrace deposits author Qpt? Latest Pleistocene stream terrace deposits (queried) author Qt Latest Pleistocene to Holocene stream terrace deposits author Qt? Latest Pleistocene to Holocene stream terrace deposits (queried) author Qt1 Younger latest Pleistocene to Holocene stream terrace deposits author Qt2 Older latest Pleistocene to Holocene stream terrace deposits author Whole numbers that are automatically generated. ptype String 35 0 0 LIQ Liquefaction susceptibility author H High Susceptibility author L Low Susceptibility author M Moderate Susceptibility author NM Not mapped author VH Very High Susceptibility author VL Very Low Susceptibility author W water author Whole numbers that are automatically generated. liq String 8 0 0 LIQ_SOURCE liq_source Integer 4 10 0 USGS usgs String 30 0 0 st_area_sh st_area_sh Double 8 38 8 st_length_ st_length_ Double 8 38 8 Shape.STArea() Shape.STArea() Double 0 0 0 Shape.STLength() Shape.STLength() Double 0 0 0 SF-QUAT2.AAT Attribute table of SF-QUAT2. ARC/INFO FNODE# Internal number of from-node Computed Sequential unique positive integer Sequential unique whole numbers that are automatically generated. TNODE# Internal number of to-node Computed Sequential unique positive integer Coordinates defining the features. LPOLY# Internal number of poly to left of arc Computed Sequential unique positive integer Positive real numbers that are automatically generated. RPOLY# Internal number of poly to right of arc Computed Sequential unique positive integer Positive real numbers that are automatically generated. LENGTH Length of arc in coverage units Computed Positive real numbers Sequential unique whole numbers that are automatically generated. SF-QUAT2# Internal feature number Computed Sequential unique positive integer SF-QUAT2-ID User-assigned feature number author Integer Set equal to SF-QUAT2# author 11 LTYPE Type of geologic or geographic feature denoted by a line in the database. author contact, approx. located depositional contact, location uncertainty greater than about +/- 100 m author contact, well located depositional contact, location uncertainty less than about +/- 100 m author contact, concealed depositional contact concealed beneath water, fill, or levee author county line Boundary of nine-county region, from 1:24,000 USGS DLGs and published paper topographic maps author map boundary Exterior boundary of 1:24,000 quadrangles composing the map area scratch boundary Enumerated_Domain_Value_Definition_Source author water boundary Boundary of open water from 1:24,000 USGS DLGs and published paper topographic maps author water boundary, 1800s Landward margin of tidal marsh bordering San Francisco Bay in the late 19th century, mainly from Nichols and Wright, 1971 author 11 LIQ 11 LIQ-SOURCE 11 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. This report combined with the explanatory pamphlet or pamphlets: of06-1037_1, of06-1037_2 and of06-1037_3. web address
http://pubs.usgs.gov/of/2006/of06-1037/
 Please contact through http://pubs.usgs.gov/of/2006/of06-1037/. This report presents a map and database of Quaternary deposits and liquefaction susceptibility for the central San Francisco Bay region. The report consists of (1) a spatial database of one data layer (Quaternary deposits), (2) two small-scale colored maps (Quaternary deposits and liquefaction susceptibility), (3) a text describing the Quaternary map and liquefaction interpretation, 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. PostScript plotfile package, of06-1037_10a.ps.gz 1.0 PostScript files generated by Arc/Info v. 7.x 4 PostScript plotfiles, one each for the Quaternary geology map, the liquefaction map, the Open-File pamphlet, and the Description of Mapping. TAR and gzip see the Open-File pamphlet (of06-1037_1x) 43.101 20110401 C.M. Wentworth U.S. Geological Survey Geologist Emeritus Mailing
345 Middlefield Rd., MS 977
Menlo Park CA 94025 USA 650-329-4950 FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time None Unclassified None http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile en 20150731 11210300 FALSE 20210226 12435500 20210226 12435500 LiquefactionSusceptibility 002 453648.811600 659309.653300 4083986.263500 4301885.736400 1 43.101 Projected GCS_North_American_1983 NAD_1983_StatePlane_California_III_FIPS_0403_Feet <ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/10.7'><WKT>PROJCS[&quot;NAD_1983_StatePlane_California_III_FIPS_0403_Feet&quot;,GEOGCS[&quot;GCS_North_American_1983&quot;,DATUM[&quot;D_North_American_1983&quot;,SPHEROID[&quot;GRS_1980&quot;,6378137.0,298.257222101]],PRIMEM[&quot;Greenwich&quot;,0.0],UNIT[&quot;Degree&quot;,0.0174532925199433]],PROJECTION[&quot;Lambert_Conformal_Conic&quot;],PARAMETER[&quot;False_Easting&quot;,6561666.666666666],PARAMETER[&quot;False_Northing&quot;,1640416.666666667],PARAMETER[&quot;Central_Meridian&quot;,-120.5],PARAMETER[&quot;Standard_Parallel_1&quot;,37.06666666666667],PARAMETER[&quot;Standard_Parallel_2&quot;,38.43333333333333],PARAMETER[&quot;Latitude_Of_Origin&quot;,36.5],UNIT[&quot;Foot_US&quot;,0.3048006096012192],AUTHORITY[&quot;EPSG&quot;,2227]]</WKT><XOrigin>-115860600</XOrigin><YOrigin>-93269500</YOrigin><XYScale>3048.0060960121928</XYScale><ZOrigin>0</ZOrigin><ZScale>1</ZScale><MOrigin>0</MOrigin><MScale>1</MScale><XYTolerance>0.0032808333333333331</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>102643</WKID><LatestWKID>2227</LatestWKID></ProjectedCoordinateSystem> Linear Unit: Foot_US (0.304801) 1.0 150000000 5000 FGDC Version 6.2 (Build 9200) ; Esri ArcGIS 10.7.0.10450 LiquefactionSusceptibility Suggested Citation Short: USGS, 2006 Long: USGS. 2006. Maps of Quaternary Deposits and Liquefaction Susceptibility in the Central San Francisco Bay Region, California. Open-File Report 2006-1037. Version 1.1. U.S. Geological Survey in cooperation with the California Geological Survey. 453648.8116 659309.6533 4301885.7364 4083986.2635 1 -123.534266 -121.164124 38.865812 36.888416 1 002 1 -123.534266 -121.164124 38.865812 36.888416 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. <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This report presents a map and database of Quaternary deposits and liquefaction susceptibility for the urban core of the San Francisco Bay region. It supercedes the equivalent area of U.S. Geological Survey Open-File Report 00-444 (Knudsen and others, 2000), which covers the larger 9-county San Francisco Bay region. The report consists of (1) a spatial database, (2) two small-scale colored maps (Quaternary deposits and liquefaction susceptibility), (3) a text describing the Quaternary map and liquefaction interpretation (part 3), and (4) a text introducing the report and describing the database (part 1). All parts of the report are digital; part 1 describes the database and digital files and how to obtain them by downloading across the internet. 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 consistent detailed treatment of the central part of the 9-county region in which much of the mapping of Open-File Report 00-444 was either at smaller (less detailed) scale or represented only preliminary revision of earlier work. Like Open-File Report 00-444, the current mapping uses geomorphic expression, pedogenic soils, inferred depositional environments, and geologic age to define and distinguish the map units. Further scrutiny of the factors controlling liquefaction susceptibility has led to some changes relative to Open-File Report 00-444: particularly the reclassification of San Francisco Bay mud (Qhbm) to have only MODERATE susceptibility and the rating of artificial fills according to the Quaternary map units inferred to underlie them (other than dams ? adf). The two colored maps provide a regional summary of the new mapping at a scale of 1:200,000, a scale that is sufficient to show the general distribution and relationships of the map units but not to distinguish the more detailed elements that are present in the database. The report is the product of cooperative work by the National Earthquake Hazards Reduction Program (NEHRP) and National Cooperative Geologic Mapping Program of the U.S. Geological Survey, William Lettis and &amp; Associates, Inc. (WLA), and the California Geological Survey. An earlier version was submitted to the U.S. Geological Survey by WLA as a final report for a NEHRP grant (Witter and others, 2005). The mapping has been carried out by WLA geologists under contract to the NEHRP Earthquake Program (Grant 99-HQ-GR-0095) and by the California Geological Survey.</SPAN></P><P><SPAN>For detailed information about the map the USGS has an open report, "Maps of Quaternary Deposits and Liquefaction Susceptibility in the Central San Francisco Bay Region, California. U.S. Geological Survey Open File Report 2006-1037 Version 1.1. </SPAN><A href="http://pubs.usgs.gov/of/2006/1037/"><SPAN>http://pubs.usgs.gov/of/2006/1037/</SPAN></A></P></DIV></DIV></DIV> Geology by Robert C. Witter, Keith L. Knudsen, Janet M. Sowers, Carl M. Wentworth, Richard D. Koehler, and Carolyn E. Randolph. Digital database by Carl M. Wentworth, Suzanna K. Brooks, and Kathleen D. Gans Quaternary surficial deposits Liquefaction susceptibility Liquefaction Earthquake ground effects Earthquake ground failures Digital spatial database Vector data Soils <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Use is limited by the 1:24,000 scale spatial resolution of the data.</SPAN></P></DIV></DIV></DIV> ISO 19115 Geographic Information - Metadata DIS_ESRI1.0 dataset 002 withheld Local Area Network 43.101 Shapefile Feature Class 43.101 NAD_1983_UTM_Zone_10N EPSG 5.3(9.0.0) 0 20210226