Metadata: Identification_Information: Citation: Citation_Information: Originator: Janet M. Sowers Originator: Jay S. Noller Originator: William R. Lettis Publication_Date: 1998 Title: Quaternary geology and liquefaction susceptibility, Napa, California 1:100,000 quadrangle: A digital database Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 98-460 Online_Linkage: http://pubs.usgs.gov/of/1998/of98-460/ Description: Abstract: This Open-File report consists of a digital geologic map database and associated digital plot files and text files, revised from a hard copy by Sowers and others (1995). This digital map database provides current information on Quaternary geology and liquefaction susceptibility of the Napa, California, 1:100,000 quadrangle. The database delineates map units that are identified by general age and lithology following the stratigraphic nomenclature of the U.S. Geological Survey. Purpose: Earthquake-induced ground failures such as liquefaction have historically brought loss of life and damage to property and infrastructure. Observations of the effects of historical large-magnitude earthquakes show that the distribution of liquefaction phenomena is not random. Liquefaction is restricted to areas underlain by loose, cohesionless sands and silts that are saturated with water. These areas can be delineated on the basis of thorough geologic, geomorphic, and hydrologic mapping and map analysis. Once potential liquefaction zones are delineated, appropriate public and private agencies can prepare for and mitigate seismic hazard in these zones. In this study, we create a liquefaction susceptibility map of the Napa 1:100,000 quadrangle using Quaternary geologic mapping, analysis of historical liquefaction information, groundwater data, and data from other studies. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1998 Currentness_Reference: publication date of digital map database Status: Progress: complete Maintenance_and_Update_Frequency: none planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -123.0 East_Bounding_Coordinate: -122.0 North_Bounding_Coordinate: 38.5 South_Bounding_Coordinate: 38.0 Access_Constraints: none Use_Constraints: none Keywords: Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: geology Theme_Keyword: geologic maps Theme_Keyword: geologic structure Theme_Keyword: liquefaction Theme_Keyword: hazards Theme_Keyword: surficial geoologic units Theme_Keyword: Quaternary Theme_Keyword: geospatial datasets Theme: Theme_Keyword_Thesaurus: National Geologic Map Database Catalog themes, augmented Theme_Keyword: 3400 - Graphical Theme_Keyword: 3100 - Vector Theme_Keyword: 3420 - PostScript Theme_Keyword: 3110 - ESRI Theme_Keyword: 3112 - export Theme_Keyword: 1100 - Geology Theme_Keyword: 1101 - General Theme_Keyword: 1500 - Hazards Theme_Keyword: 1501 - Earthquakes Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Categories Theme_Keyword: geoscientificInformation Place: Place_Keyword_Thesaurus: Augmented FIPS 10-4 and FIPS 6-4 Place_Keyword: f06041 = Marin Place_Keyword: f06097 = Sonoma Place_Keyword: f06095 = Solano Place_Keyword: f06055 = Napa Place_Keyword: f06113 = Yolo Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Janet M. Sowers Contact_Organization: William Lettis & Associates, Inc. Contact_Address: Address_Type: mailing Address: Willam Lettis & Associates, Inc., 1777 Botelho Dr., Suite 262 City: Walnut Creek State_or_Province: CA Postal_Code: 94596 Country: USA Contact_Voice_Telephone: (925)256-6070 Contact_Facsimile_Telephone: (925)256-6076 Contact_Electronic_Mail_Address: info@lettis.com Browse_Graphic: Browse_Graphic_File_Name: http://pubs.usgs.gov/of/1998/of98-460/na_plate1.pdf Browse_Graphic_File_Description: PDF representation of the Quaternary geologic map sheet. Browse_Graphic_File_Type: PDF Browse_Graphic: Browse_Graphic_File_Name: http://pubs.usgs.gov/of/1998/of98-460/na_plate2.pdf Browse_Graphic_File_Description: PDF representation of the liqeuefaction map sheet. Browse_Graphic_File_Type: PDF Native_Data_Set_Environment: ARC/INFO version 7.0.4 Data_Set_Credit: We thank the various people and agencies who provided access to borehole logs and other information on local geology. These include the California Department of Transportation, Wayne Wirick of the City of Sonoma, Sue Kelley of the City of Sebastopol, Roland Brust and Joe Gaffney of the City of Rohnert Park, Maurice Magsamem of the City of Santa Rosa, Janette Alm of CH2MHill, Anthony Quicho of the City of Martinez, Albert Hurd of the City of Fairfield, Gilbert Yau of the City of Vallejo, and Don Cardwell of the City of Napa. Assistance in field work and map compilation was provided by Jeff Unruh, Meg Schram, Steve Thompson, Tina Wickens, Raymond Huang, and Colleen Haraden of William Lettis & Associates, Inc. We thank Edward Helley for assistance in obtaining reports, maps, and photography of the study area, and John Tinsley and Chuck Real for helpful discussions. Earl Brabb provided guidance during the review process and made the USGS publication of this map possible. John Tinsley and Edward Helley reviewed the manuscript. This research was supported by the U. S. Geological Survey (USGS), Department of the Interior, under USGS award number 14-08-0001-G2129. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U. S. Government. Data_Quality_Information: Logical_Consistency_Report: This digital map database, compiled from previously published data, and new mapping by the authors, represents the general distribution of surficial deposits in the Napa region. Completeness_Report: Only surficial deposits. All bedrock is mapped as undifferentiated. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Sowers, J.M. Originator: Noller, J.S. Originator: Lettis, W.R. Publication_Date: 1995 Title: Maps showing Quaternary geology and liquefaction susceptibility in the Napa, California, 1:100,000 sheet Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: OFR-95-205 Source_Scale_Denominator: 100,000 Type_of_Source_Media: paper Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1995 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Sowers and others (1995) Source_Contribution: The digital map database was revised from this hard copy. Process_Step: Process_Description: Digital Compilation The geologic map information was digitized from stable original of the geologic map at 1:100,000 scale. The author manuscripts (pencil on mylar) were scanned using a Altek monochrome scanner with a resolution of 800 dots per inch. The scanned images were vectorized and transformed from scanner coordinates to projection coordinates with digital tics placed by hand at map corners. The scanned lines were edited interactively by hand using ALACARTE, color boundaries were tagged as appropriate, and scanning artifacts visible at 1:100,000 were removed. Base Maps Base Map layers were prepared from scale-stable printing negatives of the U.S. Geological Survey Napa, California 1:100,000 topographic maps, which have a 50 meter contour interval. Scanned and vectorized images were transformed from scanner coordinates to projection coordinates with digital tics placed by hand at map corners. The images were then trimmed interactively by hand using ALACARTE to conform to the area of the geologic coverages, and the four portions were combined. Process_Step: Process_Description: Creation of original metadata record Process_Date: 20000724 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jennifer Lenz Contact_Organization: US Geological Survey Contact_Address: Address_Type: mailing Address: 12201 Surise Valley Drive, Mail Stop 918 City: Reston State_or_Province: VA Postal_Code: 20192 Country: USA Contact_Voice_Telephone: 703-648-6974 Contact_Facsimile_Telephone: 703-648-6560 Contact_Electronic_Mail_Address: pschweitzer@usgs.gov Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Entity point SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Complete chain SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 10 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -123 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: unknown Ordinate_Resolution: unknown Planar_Distance_Units: meters Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: NA-GEOL.PAT Entity_Type_Definition: Geologic map units Entity_Type_Definition_Source: OFR-98-460 Attribute: Attribute_Label: PTYPE Attribute_Definition: Polygon type Attribute_Definition_Source: OFR-98-460 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: af Enumerated_Domain_Value_Definition: Artificial fill. Material constructed or deposited by humans. Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Qhr Enumerated_Domain_Value_Definition: Estuarine deposits (bay mud) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Qhr/af Enumerated_Domain_Value_Definition: Estuarine deposits with areas of artificial fill Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Qhi Enumerated_Domain_Value_Definition: Latest Holocene alluvial deposits Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Qhi/Qhb Enumerated_Domain_Value_Definition: Latest Holocene flood plain and basin deposits along Laguna de Santa Rosa Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Qhs Enumerated_Domain_Value_Definition: Holocene dune and beach sand Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Qhb Enumerated_Domain_Value_Definition: Holocene basin deposits Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Qht Enumerated_Domain_Value_Definition: Holocene terrace deposits Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Qhf Enumerated_Domain_Value_Definition: Holocene fan deposits Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Qha Enumerated_Domain_Value_Definition: Holocene alluvium, undifferentiated Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Qs Enumerated_Domain_Value_Definition: Late Pleistocene to Holocene dune sands Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Qt Enumerated_Domain_Value_Definition: Late Pleistocene to Holocene terrace deposits Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Qf Enumerated_Domain_Value_Definition: Late Pleistocene to Holocene fan deposits Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Qa Enumerated_Domain_Value_Definition: Late Pleistocene to Holocene alluvium, undifferentiated Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Qpt Enumerated_Domain_Value_Definition: Late Pleistocene terrace deposits Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Qpf Enumerated_Domain_Value_Definition: Late Pleistocene fan deposits Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Qpa Enumerated_Domain_Value_Definition: Late Pleistocene alluvium, undifferentiated Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Qpm Enumerated_Domain_Value_Definition: Late Pleistocene marine terrace deposits Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Qoa Enumerated_Domain_Value_Definition: Early or middle Pleistocene fan or terrace deposits Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Qom Enumerated_Domain_Value_Definition: Early to middle Pleistocene marine terrace deposits Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: br Enumerated_Domain_Value_Definition: Pre-Quaternary deposits and bedrock, undifferentiated Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: w Enumerated_Domain_Value_Definition: Water Attribute: Attribute_Label: LIQ Attribute_Definition: Liquefaction susceptibility Attribute_Definition_Source: OFR-98-460 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: H Enumerated_Domain_Value_Definition: High susceptibility Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: L Enumerated_Domain_Value_Definition: Low susceptibility Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: L-H Enumerated_Domain_Value_Definition: low to high susceptibility Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: L-M Enumerated_Domain_Value_Definition: Low to Moderate susceptibility Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: M Enumerated_Domain_Value_Definition: Moderate susceptibility Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: M-H Enumerated_Domain_Value_Definition: Moderate to High susceptibility Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: VH Enumerated_Domain_Value_Definition: Very High susceptibility Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: VL Enumerated_Domain_Value_Definition: Very Low Susceptibility Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: w Enumerated_Domain_Value_Definition: water (not susceptible) Detailed_Description: Entity_Type: Entity_Type_Label: NA-GEOL.AAT Entity_Type_Definition: Linear features on geologic map Entity_Type_Definition_Source: OFR-98-460 Attribute: Attribute_Label: LTYPE Attribute_Definition: Line type Attribute_Definition_Source: OFR-98-460 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: contact, certain Enumerated_Domain_Value_Definition: Observed contact Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: map boundary, certain Enumerated_Domain_Value_Definition: Extent of mapped area Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: water boundary, certain Enumerated_Domain_Value_Definition: Body of water boundary Detailed_Description: Entity_Type: Entity_Type_Label: NA-GEOL.PAT Entity_Type_Definition: Surficial deposits at specific points (same attributes as polygon coverage NA-GEOL.PAT) Entity_Type_Definition_Source: OFR-98-460 Detailed_Description: Entity_Type: Entity_Type_Label: NA-HIST.PAT Entity_Type_Definition: Historical liquefaction events Entity_Type_Definition_Source: OFR-98-460 Attribute: Attribute_Label: PROBABLE_UNIT Attribute_Definition: probable geologic unit of the historical liquefaction event (same as geologic units of polygon coverage NA-GEOL.PAT) Attribute_Definition_Source: OFR-98-460 Attribute: Attribute_Label: PTTYPE Attribute_Definition: Type of event Attribute_Definition_Source: OFR-98-460 Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Ground cracks Enumerated_Domain_Value_Definition: Ground cracks were created during event Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Lateral spreading Enumerated_Domain_Value_Definition: Deposits spread laterally during event Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: ground settlement Enumerated_Domain_Value_Definition: Ground settled during event Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: sand boil Enumerated_Domain_Value_Definition: Sand boil was created during event Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Absence of cracks Enumerated_Domain_Value_Definition: No cracks were created during event Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Miscellaneous effects Enumerated_Domain_Value_Definition: Not categorized effects of event Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: USGS Information Services Contact_Address: Address_Type: mailing Address: Box 25286, Denver Federal Center City: Denver State_or_Province: Colorado Postal_Code: 80255-0046 Country: USA Contact_Voice_Telephone: 1-888-ASK-USGS Contact_Facsimile_Telephone: 1-303-202-4695 Contact_Electronic_Mail_Address: infoservices@usgs.gov Resource_Description: USGS Open-File Report 98-460 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. This database, identified as "Quaternary Geology and Liquefaction Susceptibility, Napa, California 1:100,000 Quadrangle: A digital 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. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ARCE Format_Version_Number: 7.x Format_Information_Content: >ARC/INFO export file Description of coverage > >na-geol.e00 Depositional contacts, unit labels, and liquefaction susceptibility >na-hist.e00 Historical liquefaction events >na-index.e00 Topographic contours base map (from 1:100,000 scale originals) >na-drain.e00 Drainage base map (from 1:100,000 scale originals) >na-cult.e00 Cultural and map boundary base map File_Decompression_Technique: gzip and tar Transfer_Size: 14.8 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/of/1998/of98-460/na_data.tar.gz Fees: none Metadata_Reference_Information: Metadata_Date: 20160205 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Peter N Schweitzer Contact_Organization: USGS Midwest Area Contact_Position: Collection manager, USGS Geoscience Data Clearinghouse, http://geo-nsdi.er.usgs.gov/ Contact_Address: Address_Type: mailing address Address: Mail Stop 954 12201 Sunrise Valley Dr City: Reston State_or_Province: VA Postal_Code: 20192-0002 Country: USA Contact_Voice_Telephone: 703-648-6533 Contact_Facsimile_Telephone: 703-648-6252 Contact_Electronic_Mail_Address: pschweitzer@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998