Geology and geologic hazards of offshore Eel River basin, northern California continental margin

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Michael E. Field

Originator: Samuel H. Clarke, Jr.

Originator: Michael E. White

Publication_Date: 1980

Title:

Geology and geologic hazards of offshore Eel River basin, northern California continental margin

Geospatial_Data_Presentation_Form: Paper

Series_Information:

Series_Name: Open-file report

Issue_Identification: 80-1080

Publication_Information:

Publication_Place: Menlo Park, CA

Publisher: U.S. Geological Survey

Other_Citation_Details:

Data from USGS cruise S977NC (<http://walrus.wr.usgs.gov/infobank/s/s977nc/html/s-9-77-nc.meta.html>).

Online_Linkage: <http://onlinepubs.er.usgs.gov/djvu/OFR/1980/ofr_80_1080.djvu>

Description:

Abstract:

No formal abstract is given. The prefaces states, " This report summarizes aspects of the offshore and onshore geology of the Eel River Basin, California, that are of importance in assessing the potential geological hazards to offshore petroleum exploration and development. Although these investigations focus on the identification and characterization of potential hazards in specific offshore basins, they should be considered regional in scope. They are designed to provide broad geological perspective in these areas, to be used as an adjunct to site-specific geohazards studies. The geologic phenomena investigated include faulting, seismicity, seafloor instability (e.g., submarine slides and flows), seafloor erosion and deposition, hydrocarbon seepage, hydrocarbon gases and hydrates in seafloor sediments, and diapirism."

Purpose:

"[To assess] the potential geological hazards to offshore petroleum exploration and development."

Supplemental_Information:

"This research was supported by the Pacific OCS Office of the Bureau of Land Management in Los Angeles and we are appreciative of their support." Data digitized by the USGS for inclusion into usSEABED (<http://walrus.wr.usgs.gov/usseabed>)

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 19771111

Ending_Date: 19771116

Currentness_Reference: Publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -125.0117

East_Bounding_Coordinate: -124.2175

North_Bounding_Coordinate: 41.6921

South_Bounding_Coordinate: 40.6870

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: Oceans and Estuaries

Theme_Keyword: Location

Theme_Keyword: GeoscientificInformation

Theme:

Theme_Keyword_Thesaurus:

NASA/Global Change Master Directory (GCMD) Earth Science Keyword. Version 5.3.3

Theme_Keyword: Marine Sediment

Theme_Keyword: Sediment Composition

Theme_Keyword: Sedimentary Textures

Theme_Keyword: Terrigenous Sediments

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: U.S. Geological Survey

Theme_Keyword: Branch of Pacific Marine Geology

Theme_Keyword: Coastal and Marine Geology Program

Place:

Place_Keyword_Thesaurus: Geographic Names Information System

Place_Keyword: Eel River

Place_Keyword: California

Access_Constraints:

None. Paper copy of report is available through the USGS, and is also available online.

Use_Constraints:

Cite Michael Field, Sam Clarke,and Michael White and the U.S. Geological Survey as the originators of the data.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: United States Geological Survey

Contact_Address:

Address_Type: Mail

Address: USGS Information Services

Address: Box 25286

City: Denver

State_or_Province: CO

Postal_Code: 80225

Contact_Voice_Telephone: 1-800-ASK-USGS

Browse_Graphic:

Browse_Graphic_File_Name: OFR_80_1080

Browse_Graphic_File_Description:

Screen grab of GIS-produced sample distribution, with bathymetry and land for reference.

Browse_Graphic_File_Type: JPG

Data_Set_Credit:

Michael E. Field, Samuel H. Clarke, Jr. and Michael E. White at the USGS for collection and analysis of data. For usSEABED, digitization and formatting: Jennifer Mendonca (USGS); Formatting corrections: Jane Reid (USGS) and Chris Jenkins (University of Colorado)

Native_Data_Set_Environment:

Tkme: Another editor for formal metadata by Peter N. Schweitzer (U.S. Geological Survey, Reston, VA 22092), version 2.9.13, Microsoft Windows Version 5.1; Microsoft Word 2000 9.0

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

No estimate made for original data, although the report text notes that replicate analyses show high reproducibility. For usSEABED, data were digitized, visually compared to the source and corrected. Where appropriate, data were tested for completeness using MS Excel.

Logical_Consistency_Report: Data fall within normal ranges for the given parameters.

Completeness_Report:

No estimate made for original data. For inclusion into usSEABED, all data in the report were included.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Positioning data were obtained at sea using satellite navigation and Loran C systems, and a shipborne electronic ranging system employing shore- based transponders. Radar was used infrequently for positioning where terrain masking or equipment malfunctions were encountered. Data from the satellite and Loran C systems were integrated by means of a Dead Reckoning computer (DRC). Positions derived from the DRC and electronic ranging systems initially were plotted separately and weighted according to their relative accuracy; subsequently these data were corrected and merged to produce maps of position location for geophysical tracklines and sampling stations. Estimated position accuracy ranges from + 50 m where positions were determined principally by electronic ranging (approximately 90 percent of the cruise) to an average of about + 500 m where DRC or radar positions were used exclusively (approximately 10 percent of the cruise). Positions given to 0.0001 decimal degrees.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

Precision bathymetric and shallow subbottom records were obtained using 12 kHz and 3.5 kHz profiling systems employing hull-mounted transducers and hydrophones. Subsample depths given as nearest centimeter.

Lineage:

Process_Step:

Process_Description:

" Subsamples from the surface of 63 gravity cores were analyzed for grain size distribution. About 5 grams of each sample were placed in individual 1000 ml beakers and diluted with about 100 ml of 10% hydrogen peroxide to remove particulate organic material. Remaining sediment was wet sieved through a 0.063 mm sieve to separate the sand and mud fractions. The sand fraction (>0.063 mm) was oven-dried and split into 0.5 gram fractions for size analysis with a rapid sediment analyzer (RSA) settling tube. Duplicates were run for every tenth machine run. Mud fractions (<0.063 mm) were diluted to 1000 ml, dispersed with sodium hexametaphosphate, and a 10 to 25 ml split was taken for grain size analysis using light transmission techniques on a hydrophotometer (Jordan and others, 1971; Tilly, 1977). Replicate analyses show high reproducibility using this technique. Particle size distribution and modal, median and mean size, sorting, skewness and kurtosis were calculated using both the methods of moments and graphical statistics. Duplicate analyses show no major discrepancies." [No data for carbon is given in the report]: "Subsamples from these same 63 cores were analyzed for total, inorganic (carbonate) and organic carbon. Approximately 1-2 grams of sediment from each subsample was washed twice with distilled water by centrifuging and decanting to remove fluoride and chloride salts that might affect the results of carbon analysis. Washed sediment was oven-dried, ground to fine powder with mortar and pestle, and stored in airtight glass vials at room temperature. Total carbon content was determined by combustion of 0.02 gram samples for 55 seconds in a LECO tube-induction furnace. Evolved carbon dioxide gas was measured in a LECO model WR 12 carbon determinator modified after Kolpack and Bell (1968). Inorganic carbon was determined gasometrically by measuring the amount of carbon dioxide generated from sediment (0.1 gm) treated with 2 N HCI (Kolpack and Bell, 1968). Carbon content was determined by averaging three analytical runs for each between total carbon and inorganic carbon. Calcium carbonate content was derived from the analyses by multiplying the amount of inorganic carbon by the ratio of molecular weight of CaCO3 (= 100) to the atomic weight of carbon (12). Thus, a value of 0.25% inorganic carbon equates to a value of 0.25 x 100/12 or 2.08% calcium carbonate." For usSEABED, these data were concatenated with petrographic analyses on the same samples. Petrographic data from OFR 95-614 by F. Wong. Metadata for that report is given separately.

Source_Used_Citation_Abbreviation: Jordan and others, 1971

Source_Used_Citation_Abbreviation: Kolpack and Bell, 1968

Source_Used_Citation_Abbreviation: Tilly, 1977

Process_Date: Unknown

Source_Produced_Citation_Abbreviation: OFR_80_1080

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey

Contact_Person: Michael E. Field

Contact_Address:

Address_Type: Mail

Address: USGS Pacific Science Center

Address: 400 Natural Bridges Drive

City: Santa Cruz

State_or_Province: CA

Postal_Code: 95060

Contact_Voice_Telephone: 831-427-4737

Contact_Electronic_Mail_Address: mfield@usgs.gov

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Point

Point_and_Vector_Object_Count: 105

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.0001

Longitude_Resolution: 0.0001

Geographic_Coordinate_Units: Decimal degrees

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: Point

Entity_Type_Definition: SDTS point

Entity_Type_Definition_Source: Source report

Attribute:

Attribute_Label: Sample number

Attribute_Definition: Sample number

Attribute_Definition_Source: US Geological Survey

Attribute_Domain_Values:

Unrepresentable_Domain: Alpha numeric number based on cruise and core information

Attribute:

Attribute_Label: Water depth

Attribute_Definition: Depth of water at sample site

Attribute_Definition_Source: Source report

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 55

Range_Domain_Maximum: 2467

Attribute_Units_of_Measure: Meters

Attribute_Measurement_Resolution: 1.0

Attribute:

Attribute_Label: Gravel

Attribute_Definition: Gravel

Attribute_Definition_Source: Wentworth, 1932

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0

Range_Domain_Maximum: 53.0

Attribute_Units_of_Measure: Percent

Attribute_Measurement_Resolution: 0.1

Attribute:

Attribute_Label: Sand

Attribute_Definition: Sand

Attribute_Definition_Source: Wentworth 1932

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0

Range_Domain_Maximum: 87.0

Attribute_Units_of_Measure: Percent

Attribute_Measurement_Resolution: 0.1

Attribute:

Attribute_Label: Mud

Attribute_Definition: Mud

Attribute_Definition_Source: Wentworth 1932

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 13

Range_Domain_Maximum: 100

Attribute_Units_of_Measure: Percent

Attribute_Measurement_Resolution: 0.1

Attribute:

Attribute_Label: Median

Attribute_Definition: Median grainsize

Attribute_Definition_Source: Wentworth 1932

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -1.01

Range_Domain_Maximum: 7.42

Attribute_Units_of_Measure: Phi

Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: Mean

Attribute_Definition: Mean grainsize

Attribute_Definition_Source: Inman, 1952

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.95

Range_Domain_Maximum: 8.22

Attribute_Units_of_Measure: Phi

Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: Sorting

Attribute_Definition: Standard deviation about the grain size mean

Attribute_Definition_Source: Inman, 1952

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.35

Range_Domain_Maximum: 4.11

Attribute_Units_of_Measure: Phi

Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: Skewness

Attribute_Definition: Skewness of grain size distribution

Attribute_Definition_Source: Inman, 1952

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -0.2

Range_Domain_Maximum: 0.92

Attribute_Units_of_Measure: Unitless

Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: Kurtosis

Attribute_Definition: Kurtosis of grain size distribution

Attribute_Definition_Source: Inman, 1952

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.45

Range_Domain_Maximum: 4.95

Attribute_Units_of_Measure: Unitless

Attribute_Measurement_Resolution: 0.01

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: United States Geological Survey

Contact_Address:

Address_Type: Mail

Address: USGS Information Services

Address: Box 25286

City: Denver

State_or_Province: CO

Postal_Code: 80225

Contact_Voice_Telephone: 1-800-ASK-USGS

Resource_Description: Open file report 80-1080

Distribution_Liability:

Although this dataset has been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data. Users of the data should be aware of limitations of the data due to possible imprecision due to navigational inaccuracies and limitations of the statistical data.

Standard_Order_Process:

Non-digital_Form:

Report is available through the USGS; scanned images are also available online at: <http://pubs.er.usgs.gov/pubs/ofr/ofr801080>

Fees: Unknown

Technical_Prerequisites:

Plug-in not required, but best viewed with downloadable program DjVu at <http://www.lizardtech.com/download/dl_options.php?page=plugins>

Available_Time_Period:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1980

Metadata_Reference_Information:

Metadata_Date: 2005

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey

Contact_Person: Jane A. Reid

Contact_Position: Geologist

Contact_Address:

Address_Type: Physical and mail

Address: 400 Natural Bridges Drive

City: Santa Cruz

State_or_Province: CA

Postal_Code: 95060

Contact_Voice_Telephone: 831-427-4727

Contact_Electronic_Mail_Address: jareid@usgs.gov

Contact_Instructions: Email preferred

Metadata_Standard_Name: CSDGM Version 2

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Access_Constraints: None

Metadata_Use_Constraints:

Metadata was written by a user of the data. Any information contained in the physical report is authoritative and supercedes any information given here.