Metadata: Identification_Information: Citation: Citation_Information: Originator: Ray W. Sliter, Peter J. Triezenberg, Patrick E. Hart, Amy E. Draut, William R. Normark, and James E. Conrad Publication_Date: 2008 Title: High-Resolution Chirp and Mini-Sparker Seismic-Reflection Data From the Southern California Continental Shelf--Gaviota to Mugu Canyon Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 2008-1246 Publication_Information: Publication_Place: Menlo Park, CA Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/of/2008/1246/ Geospatial_Data_Presentation_Form: seismic reflection profile section Description: Abstract: This report consists of high-resolution chirp and single-channel Sparker seismic-reflection- profile data from the Santa Barbara Channel, California. These data were acquired in 2007 using the Research Vessel Zephyr2 (USGS Cruise ID: Z-3-07-SC) and the Research Vessel Parke Snavely (USGS Cruise ID: S-7-08-SC). The data are available in binary, TIFF and JPEG image formats. Binary data are in Society of Exploration Geologists (SEG) SEG-Y format and may be downloaded for further processing or display. Reference maps and JPEG images of the profiles may be viewed with your Web browser. Purpose: Marine seismic reflection data are used to image and map sedimentary and structural features of the seafloor and subsurface. These data were acquired across the northern shelf area of the Santa Barbara Channel, Calif., as part of a multiagency effort to characterize the geologic framework and sedimentary environment of the region. The specific objective of this seismic survey is to provide seismic reflection images of the depositional geometry of the upper 50 m of subbottom stratigraphy in order to better understand the mechanisms of sediment transport and deposition. These seismic profiles provide high-quality images with approximately 20 cm of vertical resolution and up to 80 m of subbottom penetration. Supplemental_Information: Chirp seismic-reflection profiles are acquired by means of an acoustic source and a hydrophone array, both contained in a single unit towed in the water behind a survey vessel approximately 4 meters below the water surface. The sound source emits a short (30 ms) swept-frequency (500 to 7,200 Hz) acoustic pulse, which propagates through the water and sediment columns. The acoustic energy is reflected at density boundaries (such as the sea floor or sediment layers beneath the sea floor), and detected by the hydrophone array, and digitally recorded by the onboard PC-based acquisition system. As the vessel moves, this process is repeated multiple times per second, producing a two-dimensional image of the shallow geologic structure beneath the ship track. Mini-sparker profiles are collected with a 500 Joule sparker source and 15-m single-channel streamer towed at the sea surface and using the same acquisition system. Additional information about the USGS survey Z-3-07-SC is available at . Additional information about the USGS survey S-7-08-SC is available at . Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20070912 Ending_Date: 20080701 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -120.2113 East_Bounding_Coordinate: -119.0521 North_Bounding_Coordinate: 34.4701 South_Bounding_Coordinate: 34.0161 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificinformation Theme_Keyword: oceans Theme: Theme_Keyword_Thesaurus: USGS CMG InfoBank Theme_Keyword: Marine Geology Theme_Keyword: Marine Geophysics Theme_Keyword: Marine Seismic Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: Santa Barbara Channel Place_Keyword: Mugu Canyon Place_Keyword: Hueneme Canyon Place: Place_Keyword_Thesaurus: USGS CMG InfoBank Place_Keyword: CA Place_Keyword: Channel Islands National Marine Sanctuary, CA Place_Keyword: Mugu Submarine Canyon Place_Keyword: Hueneme Submarine Canyon Place_Keyword: North Pacific Ocean Place_Keyword: Northern Pacific Ocean Place_Keyword: Southern California Place_Keyword: California State Waters Place_Keyword: USA Access_Constraints: Physical materials are under controlled on-site access. If available, access to physical samples is described in the "WR CMG Sample Distribution Policy" at: http://walrus.wr.usgs.gov/infobank/programs/html/main/sample-dist-policy.html Use_Constraints: Please recognize the U.S. Geological Survey (USGS) as the source of this information. Physical materials are under controlled on-site access. Some USGS information accessed through this means may be preliminary in nature and presented without the approval of the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the responsibility of the user. This information is not intended for navigational purposes. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG) Contact_Person: Ray W. Sliter Contact_Position: Geophysicist Contact_Address: Address_Type: mailing and physical address Address: USGS, MailStop 999, 345 Middlefield Road City: Menlo Park State_or_Province: CA Postal_Code: 94025-3561 Country: USA Contact_Voice_Telephone: (650) 329-5194 Contact_Facsimile_Telephone: (650) 329-5190 Contact_Electronic_Mail_Address: rsliter@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: Browse_Graphic_File_Description: Example of single-channel chirp seismic data accessible via this report. Browse_Graphic_File_Type: JPEG Browse_Graphic: Browse_Graphic_File_Name: Browse_Graphic_File_Description: Example of single-channel chirp seismic data accessible via this report. Browse_Graphic_File_Type: TIFF Native_Data_Set_Environment: SEG-Y Cross_Reference: Citation_Information: Originator: U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG) Publication_Date: 2008 Title: USGS CMG Z-3-07-SC Metadata Other_Citation_Details: Updated daily Online_Linkage: http://walrus.wr.usgs.gov/infobank/z/z307sc/html/z-3-07-sc.meta.html Cross_Reference: Citation_Information: Originator: U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG) Publication_Date: 2008 Title: USGS CMG Z-7-08-SC Metadata Other_Citation_Details: Updated daily Online_Linkage: http://walrus.wr.usgs.gov/infobank/s/s708sc/html/s-7-08-sc.meta.html Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Data have not been independently verified. Logical_Consistency_Report: Undetermined Completeness_Report: Reference the full report for a description of data coverage. All seismic-reflection data collected on the referenced cruises have been included in this report. Some seismic profiles have gaps in them due to system crashes, mammal shutdowns or hardware maintenance. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: 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 30 meters. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Depths shown in the seismic data files are in milliseconds (round trip travel time) and are referenced to sea level. Lineage: Process_Step: Process_Description: Refer to report sections "Data Acquisition and Processing" for details of geophysical data acquisition and processing sequence used for data in this report. Ray W. Sliter Process_Date: 2008 Process_Step: Process_Description: Created bathymetry overlay using GMT Peter J. Triezenberg Process_Date: 2008 Process_Step: Process_Description: Created interactive trackline map using Google Maps API Peter J. Triezenberg Process_Date: 2008 Process_Step: Process_Description: Created downloadable Google Earth "kmz" file Peter J. Triezenberg Process_Date: 2008 Process_Step: Process_Description: Created seismic profile images using Seismic Unix to provide format options for downloading data. Ray W. Sliter Process_Date: 2008 Process_Step: Process_Description: Converted profiles to TIFF and JPEG files using ImageMagick Peter J. Triezenberg Process_Date: 2008 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG) Contact_Person: Ray W. Sliter Contact_Position: Geophysicist Contact_Address: Address_Type: mailing and physical address Address: USGS, MailStop 999, 345 Middlefield Road City: Menlo Park State_or_Province: CA Postal_Code: 94025-3561 Country: USA Contact_Voice_Telephone: (650) 329-5194 Contact_Facsimile_Telephone: (650) 329-5190 Contact_Electronic_Mail_Address: rsliter@usgs.gov Process_Step: Process_Description: Used GEODAS (GEOphysical DAta System) to create a custom bathymetric and topographic grid for the southern California region covered by the cruise maps. The website is: . The parameters used are as follows: Grid Database: US Coastal Relief Model Grids Grid Area in degrees and minutes: 34:30 N to 33:48 N, 119:00 W to 120:24 W Grid Cell Size: 3 seconds Grid Format: XYZ (lon, lat, depth), no header, space-delimited, omit empty grid cells. Cell Parameters: 4-byte floating point, tenths of meters Land/Sea Coverage: Sea cells only. Peter J. Triezenberg Process_Date: 2008 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG) Contact_Person: Peter J. Triezenberg Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: USGS, MailStop 999, 345 Middlefield Road City: Menlo Park State_or_Province: CA Postal_Code: 94025-3561 Country: USA Contact_Voice_Telephone: (650) 329-5207 Contact_Facsimile_Telephone: (650) 329-5190 Contact_Electronic_Mail_Address: ptriezenberg@usgs.gov Spatial_Data_Organization_Information: Indirect_Spatial_Reference: Horizontal X and Y locations for the seimic profiles location are provided in ASCII position files and are also stored in the SEG-Y data trace headers in the standard header locations. Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 11 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -119.0 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 3 Ordinate_Resolution: 3 Planar_Distance_Units: seconds Geodetic_Model: Horizontal_Datum_Name: World Geodetic System 1984 Ellipsoid_Name: WGS 84 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298.257 Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG) Contact_Person: Ray W. Sliter Contact_Position: Geophysicist Contact_Address: Address_Type: mailing and physical address Address: USGS, MailStop 999, 345 Middlefield Road City: Menlo Park State_or_Province: CA Postal_Code: 94025-3561 Country: USA Contact_Voice_Telephone: (650) 329-5194 Contact_Facsimile_Telephone: (650) 329-5190 Contact_Electronic_Mail_Address: rsliter@usgs.gov Contact_Instructions: Data may be available off-line only by special arrangement with the distributor above. Please use the on-line download option unless precluded by download times or access difficulties. Resource_Description: U.S. Geological Suvey Open-File Report 2008-1246 Distribution_Liability: Please recognize the U.S. Geological Survey (USGS) as the source of this information. Physical materials are under controlled on-site access. Some USGS information accessed through this means may be preliminary in nature and presented without the approval of the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the responsibility of the user. This information is not intended for navigational purposes. Any use of trade, firm, or product 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: SEG-Y, JPEG, TIFF, ASCII Transfer_Size: 2.5 gigabytes Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/of/2008/1246/ Offline_Option: Recording_Format: ISO 9660 Offline_Media: none Fees: None Technical_Prerequisites: Use of SEG-Y data requires specialized software, such as ProMax and Seisworks by Landmark Geophysical; FOCUS and SeisX by Paradigm Geophysical; SPW by Parallel Geoscience; or VISTA by Seismic Image Software. Metadata_Reference_Information: Metadata_Date: 20080724 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG) Contact_Person: Ray W. Sliter Contact_Position: Geophysicist Contact_Address: Address_Type: mailing and physical address Address: USGS, MailStop 999, 345 Middlefield Road City: Menlo Park State_or_Province: CA Postal_Code: 94025-3561 Country: USA Contact_Voice_Telephone: (650) 329-5194 Contact_Facsimile_Telephone: (650) 329-5190 Contact_Electronic_Mail_Address: rsliter@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: universal time Metadata_Access_Constraints: none Metadata_Use_Constraints: none