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U.S. Geological Survey Open-File Report 2009-1100, version 1.1

High-Resolution Seismic-Reflection and Marine Magnetic Data Along the Hosgri Fault Zone, Central California

Metadata

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Metadata:


Identification_Information:

Citation:
Citation_Information:
Originator:
Ray W. Sliter, Peter J. Triezenberg, Patrick E. Hart, Janet T. Watt, Samuel Y. Johnson, and Daniel S. Scheirer
Publication_Date: 2009
Title:
High-Resolution Seismic Reflection and Marine Magnetic Data Along the Hosgri Fault Zone--Cayucos to Pismo Beach, California
Series_Information:
Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: 2009-1100
Publication_Information:
Publication_Place: Menlo Park, CA
Publisher: U.S. Geological Survey
Online_Linkage: <https://pubs.usgs.gov/of/2009/1100/>
Geospatial_Data_Presentation_Form: seismic reflection profile section

Description:
Abstract:
This report consists of high-resolution chirp and single-channel mini-sparker seismic-reflection profile data from the offshore San Luis Obispo County, California. These data were acquired in 2008 and 2009 using the Research Vessel Parke Snavely (USGS Field Activity IDs: S-6-08-SC, S-6-09-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 in in the offshore areas between Cayucos and Pismo Beach from the nearshore (~6 m depth) to just west of the Hosgri Fault Zone, in support of the California State Waters Mapping Program and the Cooperative Research and Development Agreement (CRADA) between Pacific Gas & Electric Company and the U.S. Geological Survey. The specific objective of this seismic survey is to provide seismic reflection images and magnetic anomaly maps of the depositional geometry of the upper 50 m of subbottom stratigraphy in order to better understand the mechanisms of sediment transport and deposition. Another objective of the survey is to identify offsets in sedimentary strata and basement rocks to characterize important fault properties. These seismic profiles provide high-quality images with approximately 1 m of vertical resolution and up to 120 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.

Marine magnetic data were collected using a Geometrics G882 cesium vapor magnetometer that was towed approximately 30 m behind the vessel. Data were recorded using Geometrics MagLog acquisition software. A magnetic base station was setup onshore to record continuous measurements of the local magnetic field. A proton precession magnetometer was used for the base station.

Additional information about the USGS field activity S-6-08-SC is available at <http://walrus.wr.usgs.gov/infobank/s/s608sc/html/s-6-08-sc.meta.html>.

Additional information about the USGS field activity S-6-09-SC is available at <http://walrus.wr.usgs.gov/infobank/s/s609sc/html/s-6-09-sc.meta.html>.

Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20080610
Ending_Date: 20090808

Currentness_Reference: ground condition

Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -121.3756
East_Bounding_Coordinate: -120.6368
North_Bounding_Coordinate: 35.6843
South_Bounding_Coordinate: 34.8424

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
Theme_Keyword: Marine Magnetics

Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: Morro Bay
Place_Keyword: Point Buchon
Place_Keyword: Point Sal
Place_Keyword: Cayucos
Place_Keyword: Pismo Beach
Place_Keyword: San Simeon
Place_Keyword: Santa Maria

Place:
Place_Keyword_Thesaurus: USGS CMG InfoBank
Place_Keyword: CA
Place_Keyword: Hosgi Fault Zone
Place_Keyword: North Pacific Ocean
Place_Keyword: Northern Pacific Ocean
Place_Keyword: Southern California
Place_Keyword: California State Waters
Place_Keyword: USA

Access_Constraints:
Information presented in this publication is considered public information and may be distributed or copied.

Use_Constraints:
Please recognize the U.S. Geological Survey (USGS) as the source of this information.

This information is not intended for navigational purposes.

Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

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.

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: <https://pubs.usgs.gov/of/2009/1100/tracklines/sparker2008/jpg/PBS-07.jpg>
Browse_Graphic_File_Description:
Example of single-channel mini-sparker seismic data accessible via this report.
Browse_Graphic_File_Type: JPEG

Data_Set_Credit: U.S. Geological Survey

Native_Data_Set_Environment: SEG-Y

Cross_Reference:
Citation_Information:
Originator: U.S. Geological Survey (USGS), Coastal and Marine Geology (CMG)
Publication_Date: 2009
Title: USGS CMG S-6-09-SC Metadata
Online_Linkage:
<http://walrus.wr.usgs.gov/infobank/s/s609sc/html/s-6-09-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: 2009

Process_Step:
Process_Description:
Created bathymetry overlay using GMT <http://gmt.soest.hawaii.edu/>. - Peter J. Triezenberg
Process_Date: 2009

Process_Step:
Process_Description:
Created interactive trackline map using Google Maps API <http://code.google.com/apis/maps/>. - Peter J. Triezenberg
Process_Date: 2010

Process_Step:
Process_Description:
Created downloadable Google Earth "kmz" file <http://code.google.com/apis/kml/>. - Peter J. Triezenberg
Process_Date: 2010

Process_Step:
Process_Description:
Created seismic profile images using Seismic Unix <http://www.cwp.mines.edu/cwpcodes/> to provide format options for downloading data. - Ray W. Sliter
Process_Date: 2009

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:
Converted profiles to TIFF and JPEG files using ImageMagick <http://www.imagemagick.org/>. - Peter J. Triezenberg
Process_Date: 2009

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: <http://www.ngdc.noaa.gov/mgg/geodas/geodas.html>. 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: 2009

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

Process_Step:
Process_Description:
Processed raw magnetic data using GMT <http://gmt.soest.hawaii.edu/>. Also used several Unix utilities and some home-grown programs to convert the raw ship and base-station magnetic data into the corrected form for import into Oasis montaj. - Daniel S. Scheirer
Process_Date: 2009

Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey (USGS)
Contact_Person: Daniel S. Scheirer

Contact_Address:
Address_Type: mailing and physical address
Address: USGS, MailStop 989, 345 Middlefield Road
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025-3561
Country: USA

Contact_Voice_Telephone: (650) 329-4127

Contact_Electronic_Mail_Address: dscheirer@usgs.gov

Process_Step:
Process_Description:
Performed magnetic survey leving using Oasis montaj <http://www.geosoft.com/pinfo/oasismontaj/index.asp>. - Janet T. Watt
Process_Date: 2009

Process_Step:
Process_Description:
Gridded preliminary magnetic data and exported TIFF files using Oasis montaj <http://www.geosoft.com/pinfo/oasismontaj/index.asp>. - Janet T. Watt
Process_Date: 2009

Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey (USGS)
Contact_Person: Janet T. Watt

Contact_Address:
Address_Type: mailing and physical address
Address: USGS, MailStop 989, 345 Middlefield Road
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025-3561
Country: USA

Contact_Voice_Telephone: (650) 329-5307

Contact_Electronic_Mail_Address: jwatt@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: 10
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


Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
Ascii data sets s-6-08-sc.410_sparker, s-6-08-sc.410_chirp, s-6-09-sc.410_sparker have initial header records followed by data records with these fields - 4-digit year, 3-digit day of year, 2-digit hour, 2-digit minute, 2-digit second, 1-digit tenth of second, decimal degree latitude, decimal degree longitude, alpha-numeric line ID, FFID number, Shot number, and CDP number. Example:

					! 08/22/2008 ray s-6-08-sc.410_chirp
					! /infobank/programs/edit/mergeit/mergeit
					! merged nav with times from SEG-Y headers -RS
					!
					20081641603410  35.38477 -120.88194       PBC-05         1         1         1
					20081641604090  35.38448 -120.88248       PBC-05         2         2         2
					20081641604100  35.38447 -120.88250       PBC-05         4         4         4
					20081641604110  35.38445 -120.88252       PBC-05         6         6         6
					20081641604120  35.38444 -120.88254       PBC-05         9         9         9
					20081641604130  35.38443 -120.88256       PBC-05        11        11        11
					
Entity_and_Attribute_Detail_Citation:
U.S. Geological Survey, USGS CMG InfoBank format for Seismic FFID/Shot/CDP data, 2009, <http://walrus.wr.usgs.gov/infobank/programs/html/dictionary2html/format_410.html>.

Overview_Description:
Entity_and_Attribute_Overview:
Ascii data set s-6-09-sc.mag.csv.zip, exported from Oasis montaj as a .csv file, has initial header records followed by data records with these fields - date yr/mo/day, day of June 2008 in Pacific Daylight Time, time hr:mn:sc, decimal degree latitude, decimal degree longitude, ship speed-knots, magnetometer signal level, raw magnetic data-nanotesla, magnetic data with IGRF correction-nanotesla, base station magnetic data-nanotesla, magnetic data with IGRF and base station correction-nanotesla, magnetic data with IGRF/base station/leveling correction-nanotesla. The data are separated by line number. Example:

					/Date,Day_of_Jun2008_PDT_,Time,LatMag,LonMag,Speed_kts,SignalLevel,Mag_raw,Mag_IGRF,Basemag,Mag_corr_basemag,Mag_level
					//Flight 0
					//Date 2008/09/17
					Line  0
					2008/06/10,10.587384,14:05:50,35.2820680,-121.0099651,3.67,1605.4,47800.243,-174.0,-24.4,-149.7,-143.6
					2008/06/10,10.587442,14:05:55,35.2821117,-121.0098761,4.57,1601.7,47800.509,-173.7,-24.4,-149.3,-143.2
					2008/06/10,10.587500,14:06:00,35.2821745,-121.0097416,5.33,1617.0,47801.237,-173.1,-24.4,-148.7,-142.6
					2008/06/10,10.587558,14:06:05,35.2822343,-121.0096140,5.38,1630.7,47800.939,-173.4,-24.4,-149.0,-142.9
					2008/06/10,10.587616,14:06:10,35.2822985,-121.0094773,5.41,1633.6,47800.897,-173.5,-24.4,-149.1,-143.0
					2008/06/10,10.587674,14:06:15,35.2823586,-121.0093479,5.32,1635.4,47802.066,-172.4,-24.5,-147.9,-141.8
					
Entity_and_Attribute_Detail_Citation:
Geosoft, Oasis montaj, 2009, <http://www.geosoft.com/pinfo/oasismontaj/index.asp>.


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 2009-1100

Distribution_Liability:
Information presented in this publication is considered public information and may be distributed or copied. Please recognize the U.S. Geological Survey (USGS) as the source of this information.

This information is not intended for navigational purposes.

Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

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.

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: <https://pubs.usgs.gov/of/2009/1100/>
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: 20090219

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

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