Jonathan R. Childs Patrick Hart Terry R. Bruns Michael S. Marlow Ray Sliter 2000 ASCII, gif, SEG-Y Open-File Report 2000-0494 Menlo Park, CA U.S. Geological Survey https://doi.org/10.3133/ofr00494 http://pubs.usgs.gov/of/2000/0494/ Jonathan R. Childs Patrick Hart Terry R. Bruns Michael S. Marlow Ray Sliter 2019 Open-File Report 2000-0494 Menlo Park, CA U.S. Geological Survey https://doi.org/10.3133/ofr00494 http://pubs.usgs.gov/of/2000/0494/ Between 1993 and 1997, the U.S. Geological Survey acquired high-resolution, marine seismic-reflection profile data across submerged portions of known and inferred upper crustal fault zones throughout the greater San Francisco Bay area. This particular dataset was acquired in 1997 during USGS Field Activity J4-97-SF using the vessel David Johnston. The dataset includes navigational data in ASCII format, gif images of the seismic-profile lines, and seismic data in industry-standard SEG-Y format. These data are also available via GeoMapApp (http://www.geomapapp.org/) and Virtual Ocean (http://www.virtualocean.org/) earth science exploration and visualization applications. Marine seismic reflection data are used to image and map sedimentary and structural features of the seafloor and subsurface. These data are useful in mapping faults (such as the San Andreas and Hayward Faults) where they pass under the waters of the San Francisco Bay, and in assessing other submarine geologic characteristics and features. Additional information about the USGS field activity from which these data were collected may be found at: https://cmgds.marine.usgs.gov/fan_info.php?fan=J497SF 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 dataset in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology. 19970304 19970306 ground condition at time data were collected Complete None planned -122.29 -122.23 37.69 37.61 USGS Metadata Identifier USGS:dc374b3c-72c1-4357-9a70-00c32b759f71 None marine seismic reflection profile SEG-Y data J497SF David Johnston U.S. Geological Survey USGS Coastal and Marine Hazards and Resources Program CMHRP Pacific Coastal and Marine Science Center PCMSC Data Categories for Marine Planning distributions substrate ISO 19115 Topic Category geoscientificInformation Marine Realms Information Bank (MRIB) keywords seismic reflection profiling marine geophysics USGS Thesaurus seismic reflection methods sub-bottom profiling marine geophysics Geographic Names Information System (GNIS) San Francisco Bay San Pablo Bay San Andreas Fault State of California None Golden Gate Northern California Hayward Fault None USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data. U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov Unknown Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the accompanying Open-File Report carefully for additional details. Seismic reflection profiles are acquired by means of an acoustic source (usually generated electromagnetically or with compressed air), and a hydrophone or hydrophone array. Both elements are typically towed in the water behind a survey vessel. The sound source emits a short acoustic pulse, which propagates through the water and sediment columns. The acoustic energy is reflected at density boundaries (such as the seafloor or sediment layers beneath the seafloor), and detected at the hydro-phone. This process is repeated at intervals ranging between 250 milliseconds and 10 seconds depending on the source type. Users are advised to read the Instrumentation and Data Processing sections of the accompanying Open-File Report for specifics to each data-collection cruise. Seismic data are stored in SEG-Y format, which is a standard digital format that can be read and manipulated by most seismic-processing software packages. The SEG-Y file format includes a 3200-byte descriptive header that should contain detailed information regarding the data acquisition and processing parameters. The navigation data are stored in flat ASCII files as latitude and longitude values that can be used to plot track maps of the seismic profiles at any scale or map projection desired. The data and format of the navigation files are described in the file prologue. Gif images of the seismic-reflection profiles are also available. 19991005 Jonathan R. Childs U.S. Geological Survey geophysicist mailing and physical address

Mail Stop 999 345 Middlefield Rd.

Menlo Park CA 94025 650-329-5195 jchilds@usgs.gov Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. 20170124 U.S. Geological Survey Alan O. Allwardt Contractor -- Information Specialist mailing and physical address

2885 Mission Street

Santa Cruz CA 95060 831-460-7551 831-427-4748 aallwardt@usgs.gov Edits were made to bring the metadata up to current PCMSC standards including information about the accompanying Open-File Report, standardizing authors' names, adding a doi# link, correcting typos, refining keywords, and using current access and distribution liability statements. Point of Contact and Metadata Contact information sections were changed to static PCMSC contact information. No data were changed. Users are advised to compare the metadata date of this file to any similar file to ensure they are using the most recent version. 20200102 Susan A Cochran U.S. Geological Survey, Pacific Coastal and Marine Science Center mailing and physical

2885 Mission St.

Santa Cruz CA 95060 United States 831-460-7545 scochran@usgs.gov Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. 20201019 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov Seismic-reflection data are available in SEG-Y format, which includes self-contained headers with attribute information; navigation data are available in ASCII format with header information; profiles are available in gif format. Producer U.S. Geological Survey Clint Steele mailing and physical address

Mail Stop 999 345 Middlefield Rd.

Menlo Park CA 94025 650-329-5055 csteele@usgs.gov Downloadable SEG-Y data, navigation information in ASCII format, gif images of seismic-reflection profiles Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. various none https://pubs.usgs.gov/of/2000/0494/#coverage https://pubs.usgs.gov/of/2000/0494/#segy https://pubs.usgs.gov/of/2000/0494/nav_meta/j497sf.ebc https://pubs.usgs.gov/of/2000/0494/nav_meta/j497sf.txt Data can be downloaded using the Network_Resource_Name links. The first link takes the user to the section of the Open-File Report where the tracklines for all field activities can be seen in Figure 1. Figures 2 through 5 are zoomed in geographical areas that show the trackline numbers. The second link takes the user to the section of the Open-File Report where one can link to the digital SEG-Y data and profile images based on the geographical areas shown in Figures 2 through 5. The third link is for the header file of the SEG-Y data and describes many of the parameters. The fourth link is for the navigational data for this particular field activity. Users are advised to read the Open-File Report completely. none 20201019 U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

Santa Cruz CA 95060-5792 US 831-427-4747 pcmsc_data@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998