Ray W. Sliter William R. Normark Christina E. Gutmacher 2005 Version 1.0 Text report containing graphical map images and geophysical data images (no spatial referencing). USGS Open-File Report USGS OFR 2005-1084 Menlo Park, California United States Geological Survey <http://pubs.usgs.gov/of/2005/1084/> Multichannel seismic-reflection (MCS) data were collected in the California Continental Borderland as part of southern California Earthquake Hazards Task. Five data acquisition cruises conducted over a six-year span collected MCS data from offshore Santa Barbara, California south to the Exclusive Economic Zone boundary with Mexico. The primary mission was to map late Quaternary deformation as well as identify and characterize fault zones that have potential to impact high population areas of southern California. To meet its objectives, the project work focused on the distribution, character, and relative intensity of active (i.e., Holocene) deformation along the continental shelf and basins adjacent to the most highly populated areas. In addition, the project examined the Pliocene-Pleistocene record of how deformation shifted in space and time to help identify actively deforming structures that may constitute current significant seismic hazards. The MCS data accessible through this report cover the first four years of survey activity and include data from offshore Malibu coastal area west of Santa Monica, California to the southern survey limit offshore San Diego. The MCS data, which were collected with a 250-m-long, 24-channel streamer used a small gas-injector airgun source. This system provided optimum resolution of the upper 1 to 2 km of sediment for mapping active fault systems. The report includes trackline maps showing the location of the data, as well as both digital data files (SEG-Y) and images of all of the profiles. These MCS data were collected as part of a project to identify the active fault systems in the southern California coastal zone, including the continental shelf and adjacent deep basins, that pose the greatest potential seismic hazards for the most populated urban corridor along the U.S. Pacific margin. See http://walrus.wr.usgs.gov/cabrillo/tierra/index.html for more information. This report is prepared to make these data available to science researchers, students, and other interested parties. Additional information for these USGS Coastal and Marine Geology field activities is available online at <http://walrus.wr.usgs.gov/infobank/s/s197sc/html/s-1-97-sc.meta.html>, <http://walrus.wr.usgs.gov/infobank/a/a198sc/html/a-1-98-sc.meta.html>, <http://walrus.wr.usgs.gov/infobank/o/o199sc/html/o-1-99-sc.meta.html>, and <http://walrus.wr.usgs.gov/infobank/a/a100sc/html/a-1-00-sc.meta.html>. 19970801 20001001 Time span of data collection and initial archiving. Complete None planned -119.00000 -117.00000 +34.16667 +32.50000 NASA/Global Change Master Directory (GCMD) Earth Science Keywords Version 4.2.2 Parameters Keywords > OCEANS > MARINE SEDIMENTS > STRATIGRAPHIC SEQUENCE Parameters Keywords > SOLID EARTH > ROCKS/MINERALS > SEDIMENTS Parameters Keywords > SOLID EARTH > SEISMOLOGY > SEISMIC PROFILE Platform Keywords > SHIPS Instrument Keywords > AIRGUN ARRAYS Instrument Keywords > GEOPHONES Instrument Keywords > HYDROPHONES Instrument Keywords > SEISMIC REFLECTION PROFILERS None active fault airgun deformation digital data earthquake hazards fault zone marine geology multichannel profile sediment deformation seismic data seismic reflection tsunami NASA/Global Change Master Directory (GCMD) Earth Science Keywords Version 4.2.2 Location Keywords > PACIFIC OCEAN Geographic Names Information System (GNIS), USGS, Reston, VA Pacific Ocean None California Continental Borderland Dana Point Los Angeles Point Dume San Diego Santa Monica Bay Southern California USA None Holocene Quaternary None These data are not intended for navigational purposes. Please recognize the U.S. Geological Survey (USGS) as the source of this information. Ray W. Sliter United States Geological Survey (USGS) Coastal and Marine Geology (CMG) Geophysicist mailing and physical address

USGS, Mail Stop 999, 345 Middlefield Road

Menlo Park CA 94025-3561 USA (650) 329-5194 rsliter@usgs.gov <http://pubs.usgs.gov/of/2005/1084/images/ge-overview.png> Index map of area covered in this report. PNG <http://pubs.usgs.gov/of/2005/1084/maps/o199/lines/221.html> Example of Multichannel seismic data accessible via this report. JPEG Peter Triezenberg produced the interactive web pages for this report. SEG-Y Data have not been independently verified. Undetermined. Reference the full report for a description of data coverage. All MCS data collected on the referenced cruises have been included in this report, with the exception of those collected in Los Angeles Harbor and shelf, for an aquifer study, on A-1-00-SC. Some seismic profiles have gaps in them due to system crashes or intentional shutdowns as required, under terms of our operating permit, to protect marine mammals. Tracklines shown are for the GPS antenna on the ships collecting the multichannel seismic data. Shot point numbers in the data files correspond to those in the navigation files. The horizontal positional accuracy of the seismic data thus linked to ship's position is estimated to be within 40 meters. Depths shown in the seismic data files are in milliseconds (round trip travel time) and are referenced to sea level. Refer to report sections "Cruise history", "Data acquisition methods", and "Data processing" for details of geophysical data acquisition and processing sequence used for MCS data in this report. Ray W. Sliter 2003 Plotted shot point map of cruises using GMT <http://gmt.soest.hawaii.edu/> to create sub-maps. Broke area into four sections for better viewing. Converted plots to TIFF and JPEG files for zooming in on sections. Ray W. Sliter 2004 Used GEODAS (GEOphysical DAta System) to create a custom bathymetric and topographic grid for the southern California region covered by the cruise index map. The website is: <http://www.ngdc.noaa.gov/mgg/geodas/geodas.html>. The parameters used are as follows: Grid database: US Coastal Relief Model Grids Lat/Lon Area Bounds: 34.16667 N to 32.50 N, 119.0 W to 117.0 W Grid Cell Size: 3 seconds Grid Cell Value Parameters: 4-byte integers, 10ths of meters Grid Format: xyz (lon, lat, depth) format, no header, space-delimited, exclude empty cells. Peter Triezenberg 2004 Plotted tracklines of seismic reflection profiles using GMT <http://gmt.soest.hawaii.edu/> to create maps. Created HTML image maps to allow mouse-over of trackline details and links to profile displays. Peter Triezenberg 2005 Universal Transverse Mercator 11 0.9996 -117.0 0.0 500000 0 coordinate pair 25 25 Meters North American Datum of 1983 GRS1980 6378206.4 294.98 Locations of data profiles are shown as color-coded map images at an unspecified projection and scale. These HTML image maps allow mouse over trackline details and links to profile displays. The images of the reflection profiles are rendered in TIFF and JPEG image formats. Links are provided to the SEG-Y digital data for each line. none Ray W. Sliter United States Geological Survey (USGS) Coastal and Marine Geology (CMG) mailing and physical address

USGS, Mail Stop 999, 345 Middlefield Road

Menlo Park CA 94025-3561 USA (650) 329-5194 rsliter@usgs.gov United States Geological Survey Open-File Report 2005-1084 This report is distributed on-line only. Access it at <http://pubs.usgs.gov/of/2005/1084/>. Please recognize the U.S. Geological Survey (USGS) as the source of this information. Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, these data and information are provided with the understanding that they are not guaranteed to be usable, timely, accurate, or complete. Users are cautioned to consider carefully the provisional nature of these data and information before using them for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences. Conclusions drawn from, or actions undertaken on the basis of, such data and information are the sole responsibility of the user. Neither the U.S. Government nor any agency thereof, nor any of their employees, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any data, software, information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. Trade, firm, or product names and other references to commercial products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, USDOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy. TIFF, JPEG, SEG-Y, ASCII <http://pubs.usgs.gov/of/2005/1084/> None Choose and download data via <http://pubs.usgs.gov/of/2005/1084/>. 20050316 Christina E. Gutmacher United States Geological Survey (USGS) Coastal and Marine Geology (CMG) Geologist mailing and physical address

USGS, Mail Stop 999, 345 Middlefield Road

Menlo Park CA 94025-3561 USA (650) 329-5309 cgutmacher@usgs.gov Content Standard for Digital Geospatial Metadata ("CSDGM version 2") FGDC-STD-001-1998