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U.S. Geological Survey
Open-File Report 2006-1247

High-resolution chirp seismic reflection data acquired from the Cap de Creus shelf and canyon area, Gulf of Lions, Spain in 2004



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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Eric Grossman
Originator: Patrick E. Hart
Originator: Michael E. Field
Originator: Peter Triezenberg
Publication_Date: 2006
Title:
High-resolution chirp seismic-reflection data acquired from theCap de Creus shelf and canyon area, Gulf of Lions, Spain in 2004
Series_Information:
Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: 2006-1247
Publication_Information:
Publication_Place: Menlo Park, CA
Publisher: U.S. Geological Survey
Online_Linkage: <http://pubs.usgs.gov/of/2006/1247/>
Geospatial_Data_Presentation_Form: seismic reflection profile section
Description:
Abstract:
This report consists of high-resolution chirp seismic reflection profiledata from the northern Gulf of Lions, Spain. These data were acquired in2004 using the Research Vessel Oceanus (USGS Cruise ID: O-1-04-MS). Thedata are available in binary and JPEG image formats. Binary data arein Society of Exploration Geologists (SEG) SEG-Y format and may bedownloaded for further processing or display. Reference maps andJPEG images of the profiles may be viewed with your Web browser.
Purpose:
Marine seismic reflection data are used to image and mapsedimentary and structural features of the seafloor and subsurface.These data were acquired across the shelf and canyon area of the Gulfof Lions, Spain as part of a multinational effort to characterize thegeologic framework and sedimentary environment of the region.The specific objective of this seismic survey is to provide seismicreflection images of the depositional geometry of the upper 50 meters ofsubbottom stratigraphy in order to better understand the mechanisms ofsediment transport and deposition. These chirp seismic profiles providehigh-quality images with approximately 20 cm of verticalresolution and up to 80 m of subbottom penetration.
Supplemental_Information:
Chirp seismic reflection profiles are acquired by means of anacoustic source and a hydrophone array, both contained in a single unittowed in the water behind a survey vessel. The sound source emits ashort (30 ms) swept-frequency (500 to 7200 Hz)acoustic pulse,which propagates through the water and sediment columns. The acousticenergy is reflected at density boundaries (such as the seafloor orsediment layers beneath the seafloor), and detected by the hydrophonearray, 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 structurebeneath the ship track.Additional information about the USGS survey O-1-04-MS is available at<http://walrus.wr.usgs.gov/infobank/o/o104ms/html/o-1-04-ms.meta.html>.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20030925
Ending_Date: 20031001
Currentness_Reference:
Data assumed to be constant over time, but the imaged geology maychange due to geologic processes.
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: 3.1808
East_Bounding_Coordinate: 3.4586
North_Bounding_Coordinate: 42.4418
South_Bounding_Coordinate: 42.1763
Keywords:
Theme:
Theme_Keyword_Thesaurus: General
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Geology Program
Theme_Keyword: CMGP
Theme_Keyword: EuroSTRATAFORM
Theme_Keyword: Seismic Reflection
Theme_Keyword: Sedimentation
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificinformation
Theme_Keyword: imageryBaseMapsEarthCover
Theme_Keyword: oceans
Place:
Place_Keyword_Thesaurus: General
Place_Keyword: Cap de Creus Shelf
Place_Keyword: Cap de Creus Canyon
Place_Keyword: Gulf of Lions
Place_Keyword: Spain
Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: Mediterranean Sea
Access_Constraints: None. These data are held in the public domain.
Use_Constraints:
The U.S. Geological Survey requests to be acknowledged as the originatorof the data in future products or derivative research.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Eric Grossman
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing address
Address: 400 Natural Bridges Drive
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060-5792
Country: USA
Contact_Voice_Telephone: 831-427-4725
Contact_Electronic_Mail_Address: egrossman@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name:
<http://pubs.usgs.gov/of/2006/1247/images/gol_coverage_area.png>
Browse_Graphic_File_Description:
Map of Gulf of Lions showing areas of 2004 USGS chirp seismic refleciton research cruise
Browse_Graphic_File_Type: PNG
Cross_Reference:
Citation_Information:
Originator: Alonso, B.
Originator: Canals, M.
Originator: Got, H.
Originator: Maldonado, A.
Publication_Date: 1991
Title:
Sea valleys and related depositional systems in the Gulf ofLions and Ebro continental margin
Series_Information:
Series_Name: American Association of Petroleum Geologists Bulletin
Issue_Identification: 75, p. 1195-1214
Publication_Information:
Publication_Place: Tulsa, OK
Publisher: American Association of Petroleum Geologists
Cross_Reference:
Citation_Information:
Originator: Baztan, J.
Originator: Berné, S.,
Originator: Olivet, J.-L
Originator: Rabineau, M.
Originator: Aslanian, D.
Originator: Gaudin, M.
Originator: Réhault, J.P.
Originator: Canals, M.
Publication_Date: 2005
Title:
The axial incision: the key to understand canyon evolution (inthe western Gulf of Lions)
Series_Information:
Series_Name: Marine and Petroleum Geology
Issue_Identification: 22, n. 6-7, p. 805-826
Publication_Information:
Publication_Place: Guildford, Surrey, England
Publisher: Butterworth Scientific Ltd.
Cross_Reference:
Citation_Information:
Originator: Berné, S.
Originator: Carré, D.
Originator: Loubrieu, B.
Originator: Mazé, J.-P.
Originator: Normand, A.
Publication_Date: 2001
Title:
Carte morphobathymétrique du Golfe du Lion à l’ échelle 1/100 000 éme
Publication_Information:
Publication_Place: Brest, France
Publisher: Ifremer, Brest
Cross_Reference:
Citation_Information:
Originator: Berné, S.
Originator: Gorini, C.
Publication_Date: 2005
Title:
The Gulf of Lions: An overview of recent studies within theFrench Margins’ Programme
Series_Information:
Series_Name: Marine and Petroleum Geology
Issue_Identification: 22, n. 6-7, p. 691-693
Publication_Information:
Publication_Place: Guildford, Surrey, England
Publisher: Butterworth Scientific Ltd.
Cross_Reference:
Citation_Information:
Originator: Berné, S.
Originator: Carré, B.
Originator: Loubrieu, B.
Originator: Mazé, J.P.
Originator: Morvan, L.
Originator: Normand, A.
Publication_Date: 2004
Title: Le Golfe du Lion. Carte morpho-bathymétrique
Publication_Information:
Publication_Place: Brest, France
Publisher: Ifremer, Brest
Cross_Reference:
Citation_Information:
Originator: Berné, S.
Originator: Loubrieu, B.
Originator: The Calmar scientific party
Publication_Date: 1999
Title:
Canyons and recent sedimentary processes on the westernGulf of Lions margin
Series_Information:
Series_Name:
First results of the Calmar cruise. Comptes Rendus de l'Académie des Sciences de Paris
Issue_Identification: 328: 471-477
Publication_Information:
Publication_Place: Paris
Publisher: l'Académie des Sciences de Paris
Cross_Reference:
Citation_Information:
Originator: Berné, S.
Originator: Loubrieu, B.
Originator: l’équipe embarquée CALMAR
Publication_Date: 1997
Title:
Carte morpho-bathymetrie de la marge occidentale du Golfedu Lion à l’ échelle 1/250 000 éme
Publication_Information:
Publication_Place: Brest, France
Publisher: Ifremer, Brest
Cross_Reference:
Citation_Information:
Originator: Correggiari, A.
Originator: Trincardi, F.
Originator: Langone, L.
Originator: Roveri, M.
Publication_Date: 2001
Title:
Styles of failure in Late Holocene highstand prodeltawedges on the Adriatic shelf
Series_Information:
Series_Name: Journal of Sedimentary Geology
Issue_Identification: 71, p. 218-236
Publication_Information:
Publication_Place: Tulsa, OK
Publisher: SEPM (Society for Sedimentary Geology)
Cross_Reference:
Citation_Information:
Originator: Grossman, E.E.
Originator: Hart, P.
Originator: Field, M.E.
Publication_Date: 2005
Title:
Evidence of recent sediment storage and transportfrom shallow seismic stratigraphy on the Cap de Creus shelf, Spain
Series_Information:
Series_Name:
EuroSTRATAFORM - Promess Joint Meeting, Salamanca, Spain, October 24-27, 2005
Issue_Identification: October 24-27, 2005
Other_Citation_Details:
<http://www.soc.soton.ac.uk/CHD/EUROSTRATAFORM/salamanca2005/index.html>
Cross_Reference:
Citation_Information:
Originator: Lofi, J.
Originator: Rabineau, M.
Originator: Gorini, C.
Originator: Berne, S.
Originator: Clauzon, G.
Originator: De Clarens, P.
Originator: Tadeu Dos Reis, A.
Originator: Mountain, G.S.
Originator: Ryan, W.B.F.
Originator: Steckler, M.S.
Originator: Fouchet, C.
Publication_Date: 2003
Title:
Plio-Quaternary prograding clinoform wedges of thewestern Gulf of Lion continental margin (NW Mediterranean)after the Messinian Salinity Crisis
Series_Information:
Series_Name: Marine Geology
Issue_Identification: 198(3-4): 289-317
Publication_Information:
Publication_Place: Amsterdam
Publisher: Elsevier Scientific Pub. Co
Cross_Reference:
Citation_Information:
Originator: Marsset, T.
Originator: Bellec, V.
Publication_Date: 2002
Title:
Late Pleistocene-Holocene deposits on the Rhone innercontinental shelf (France): detailed mapping andcorrelation with previous continental and marine studies
Series_Information:
Series_Name: Sedimentology
Issue_Identification: 49, p. 255-276
Publication_Information:
Publication_Place: Blackwell Scientific Publishers
Publisher: Oxford, Boston
Cross_Reference:
Citation_Information:
Originator: Rabineau, M.
Originator: Berné, S.
Originator: Le Drezen, E.
Originator: Lericolais, G.
Originator: Rutunno, M.
Publication_Date: 1998
Title:
3D architecture of lowstand and transgressive Quaternarysand bodies on the outer shelf of the Gulf of Lions, France
Series_Information:
Series_Name: Marine Petroleum Geology
Issue_Identification: 15, p. 439-452
Publication_Information:
Publication_Place: Guildford, Surrey, England
Publisher: Butterworth Scientific Ltd.
Cross_Reference:
Citation_Information:
Originator: Rabineau, M.
Originator: Berné, S.
Originator: Aslanian, D.
Originator: Olivet, J.-L.
Originator: Phillipe, J.
Originator: Guillocheau, F.
Originator: Bourillet, J.-F.
Originator: Ledrezen, E.
Originator: Granjeon, D.
Publication_Date: 2005
Title:
Sedimentary sequences in the Gulf of Lions: a record of100,000 years climatic cycles
Series_Information:
Series_Name: Marine and Petroleum Geology
Issue_Identification: 22, n. 607, p. 775-804
Publication_Information:
Publication_Place: Guildford, Surrey, England
Publisher: Butterworth Scientific Ltd.
Cross_Reference:
Citation_Information:
Originator: Schoolmeester, T.
Originator: Grossman, E.E.
Originator: García-García, A.
Originator: Canals, M.
Originator: Field, M.
Originator: Levey, M.
Originator: Fabres, J.
Originator: Orange, D.
Publication_Date: 2005
Title:
Shallow Sediment Structure revealed from High ResolutionSurveys in the Upper Cap de Creus Canyon
Series_Information:
Series_Name:
EuroSTRATAFORM - Promess Joint Meeting, Salamanca, Spain, October 24-27, 2005
Issue_Identification: October 24-27, 2005
Other_Citation_Details:
<http://www.soc.soton.ac.uk/CHD/EUROSTRATAFORM/salamanca2005/index.html>
Cross_Reference:
Citation_Information:
Originator: Torres, J.
Originator: Savoye, B.
Originator: Cochonat, P.
Publication_Date: 1995
Title:
The effects of sea level changes on the Rhone slopesedimentation (northwestern Mediterranean) as indicated by seismic stratigraphy
Series_Information:
Series_Name: Journal of Sedimentary Research
Issue_Identification: 65, p. 368-38
Publication_Information:
Publication_Place: Tulsa, OK
Publisher: SEPM (Society for Sedimentary Geology)

Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
Binary data file: Each profile isavailable as a binary file in Society of Exploration GeophysicistsSEG-Y format. A SEG-Y file consists of 1) a 3200-byte fileidentification record of EBCDIC encoded general information; 2) a400-byte binary record with information such as sample rate andrecord length specific to the data set; and 3) multiple records, oneseismic reflection trace per record. Each trace record is precededby a 240-byte "trace header" containing information such as tracenumber and acquisition day and time specific to each trace. Thetrace data are represented as a time series of unitless 16-bitinteger or 32-bit real numbers proportional to the pressure recordedat each hydrophone. The SEG-Y file is useful only if you have accessto specialized software designed to process and display seismicreflection data.
Entity_and_Attribute_Detail_Citation:
Barry, K.M., Cavers, D.A., andKneale, C.W., 1975, Recommended standards for digital tape formats:Geophysics, v. 40, n. 2, p. 344 - 352. Also available online at:<http://www.seg.org/publications/tech-stand/>
Entity_and_Attribute_Overview:
Graphic image file: Each profile isavailable as a JPEG image.

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The validity or accuracy of marine seismic reflection profiles ishighly qualitative, and depends on equipment and operating conditionvariables too numerous to quantify. There have been no efforts toassess the validity of the data.
Logical_Consistency_Report: These data have not been assessed for internal consistency.
Completeness_Report:
These are sparse line coverages (2D).Therefore, data are inherently incomplete. Geologic details betweenlines must be inferred. The surveys were not designed to cover aparticular geographic area; the line spacings and azimuths were chosento assess the regional stratigraphy.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Positions were determined withdifferential Global Positioning System (GPS). Absolute positionaccuracy was approximately plus/minus 10 m.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
The vertical position was local sea level and there have been nocorrections to a datum or for tidal variations.
Lineage:
Process_Step:
Process_Description:
Single-channel chirp seismic reflection data were acquired using anEdgetech 512i subbottom profiling system. This "fish " was towed aftof the research vessel at a depth of approximately 15 meters at aship speed of approximately 4 knots. A 30 ms swept-frequency(500 to 7200 Hz)"chirp" source signal was emitted 1 to 4 timesper second depending on water depth and the returning reflectionswere detected by hydrophones located along the bottom of the fish.The data were digitally recorded by an on-board PC-based Delph Seismicrecording system. Differential GPS position fixes were written intothe seismic data trace headers and are also available in an ASCIItext file.
Process_Date: 2004
Process_Step:
Process_Description:
Open File preparation: The seismic profiles were converted fromDelph Seimic proprietary format to standard SEG-Y format and toCGM plot files using Paradigm Focus software. Then the CGM files wereconverted to 300 dots per inch JPEG image file using Larson CGM toImage software. The SEG-Y data files and the JPEG image files areavailable for download from this on-line report.
Process_Date: 2004
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Patrick E. Hart
Contact_Organization: U.S. Geological Survey
Contact_Position: Geophysicist
Contact_Address:
Address_Type: mailing address
Address: 345 Middlefield Road Mail Stop 999
City: Menlo Park
State_or_Province: CA
Postal_Code: 94025-3561
Country: USA
Contact_Voice_Telephone: 650-329-5160
Contact_Electronic_Mail_Address: hart@usgs.gov

Spatial_Data_Organization_Information:
Indirect_Spatial_Reference:
Horizontal X and Y locations for the seimic profiles location are providedin ASCII position files and are alos stored in the SEG-Y data trace headersin the standard header locations.

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.00001
Longitude_Resolution: 0.00001
Geographic_Coordinate_Units: decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: WGS 84
Ellipsoid_Name: WGS 84
Semi-major_Axis: 6378137 m
Denominator_of_Flattening_Ratio: 298.257

Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Eric Grossman
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing address
Address: USGS, 400 Natural Bridges Drive
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060-5792
Country: USA
Contact_Voice_Telephone: 831-427-4725
Contact_Electronic_Mail_Address: egrossman@usgs.gov
Contact_Instructions:
Data may be available off-line only by specialarrangement with the distributor above. Please use the on-linedownload option unless precluded by download times or accessdifficulties.
Resource_Description: U.S. Geological Suvey Open-File Report 2006-1247
Distribution_Liability:
This dataset was prepared by an agency of theUnited States Government. Neither the United States Government nor anyagency thereof nor any of their employees, make any warranty, expressedor implied, or assumes any legal liability or responsibility forinformation, apparatus, products, or processes disclosed in thisreport, nor represents that its use would not infringe privately ownedrights. Reference herein to any specific commercial product, process,or service by trade name, trademark, manufacturer, or otherwise doesnot constitute or imply its endorsement, recommendation, or favoringby the United States Government or any agency thereof.Although all data published in this report have been used by the USGS,no warranty, expressed or implied, is made by the USGS as to theaccuracy of the data and related materials. The act of distributionshall not constitute any such warranty, and no responsibility isassumed by the USGS in the use of this data.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: SEG-Y, JPEG, ASCII
Transfer_Size: 2.5 gigabytes
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <http://pubs.usgs.gov/of/2006/1247/>
Offline_Option:
Recording_Format: ISO 9660
Offline_Media: CD-R or DVD-R
Fees: none
Technical_Prerequisites:
Use of SEG-Y data requires specialized software,such as ProMax and Seisworks by Landmark Geophysical; FOCUS and SeisXby Paradigm Geophysical; SPW by Parallel Geoscience; or VISTA bySeismic Image Software.

Metadata_Reference_Information:
Metadata_Date: 20060728
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Eric Grossman
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing address
Address: USGS, 400 Natural Bridges Drive
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060-5792
Country: USA
Contact_Voice_Telephone: 831-427-4725
Contact_Electronic_Mail_Address: egrossman@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

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URL:  http://pubs.usgs.gov/of/2006/1247/metadata.html
Contact Information:  Eric Grossman
Last Modified:  October 13, 2006 (mfd)
Generated by mp version 2.8.11 on Fri Jul 28 09:36:14 2006


Accessibility  |   FOIA  |   Privacy  |   Policies and Notices
U.S. Department of the Interior     U.S. Geological Survey

URL: http://pubs.usgs.gov/of/2006/1247/metadata.html
For more information, contact: Eric Grossman
maintained by Michael Diggles
last modified October 13, 2006 (mfd)