Magnetic-field level data collected between Punta Gorda and Fort Bragg (northern California) during field activity B-04-12-NC from 09/17/2012 to 09/25/2012

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Jeffrey W. Beeson
Originator: Samuel Y. Johnson
Originator: Chris Goldfinger
Originator: Stephen R. Hartwell
Publication_Date: 20160606
Title:
Magnetic-field level data collected between Punta Gorda and Fort Bragg (northern California) during field activity B-04-12-NC from 09/17/2012 to 09/25/2012
Geospatial_Data_Presentation_Form: comma-delimited text
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/F7GT5K8R
Publication_Information:
Publication_Place:
Pacific Coastal and Marine Science Center, Santa Cruz, California
Publisher: U.S. Geological Survey
Online_Linkage: https://doi.org/10.5066/F7GT5K8R
Online_Linkage:
https://www.sciencebase.gov/catalog/item/57044c29e4b0d4e2b7561eda
Larger_Work_Citation:
Citation_Information:
Originator: Jeffrey W. Beeson
Originator: Samuel Y. Johnson
Originator: Chris Goldfinger
Originator: Stephen R. Hartwell
Publication_Date: 2016
Title:
Marine geophysical data—Cape Mendocino to Point Arena, northern California
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/F7GT5K8R
Publication_Information:
Publication_Place: Santa Cruz, CA
Publisher:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Description:
Abstract:
This dataset includes Magnetic-field level data jointly collected by the U.S. Geological Survey (USGS) and Oregon State University in 2012, between Punta Gorda and Fort Bragg in northern California.
Purpose:
These data were collected as part of USGS efforts to better understand the northernmost section of the San Andreas Fault Zone. These data and information are intended for science researchers, students from elementary through college, policy makers, and general public.
Supplemental_Information:
Additional information about the field activity from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=B0412NC
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20120917
Ending_Date: 20120925
Currentness_Reference: ground condition at the time the data were collected
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -124.47752
East_Bounding_Coordinate: -123.78899
North_Bounding_Coordinate: 40.30684
South_Bounding_Coordinate: 39.35035
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:57044c29e4b0d4e2b7561eda
Theme:
Theme_Keyword_Thesaurus: Global Change Master Directory (GCMD)
Theme_Keyword: Bathymetry
Theme_Keyword: Continental Margins
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificInformation
Theme_Keyword: oceans
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: magnetic anomaly
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Hazards and Resources Program
Theme_Keyword: CMHRP
Theme_Keyword: Pacific Coastal and Marine Science Center
Theme_Keyword: PCMSC
Theme:
Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: distributions
Theme_Keyword: substrate
Theme:
Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords
Theme_Keyword: marine geophysics
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: magnetometer measurement
Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: Pacific Ocean
Place_Keyword: State of California
Place_Keyword: Humboldt County
Place_Keyword: Mendocino County
Place_Keyword: Fort Bragg
Place_Keyword: Point Delgada
Place_Keyword: Punta Gorda
Place_Keyword: Noyo Canyon
Place_Keyword: Shelter Cove
Access_Constraints:
None. USGS-authored or -produced data and information are in the public domain.
Use_Constraints:
The U.S. Geological Survey requests to be acknowledged as the originator of the data in future products or derivative research. Share data products developed using these data with the U.S. Geological Survey.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Contact_Person: PCMSC Science Data Coordinator
Contact_Address:
Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Contact_Voice_Telephone: 831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov
Native_Data_Set_Environment: Digital, ASCII
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report: Identified as best available version.
Logical_Consistency_Report: No formal logical accuracy tests were conducted
Completeness_Report:
Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report: Unspecified
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report: Unspecified
Lineage:
Process_Step:
Process_Description:
Magnetic data were postprocessed following the methodology of Nick Valleau at Geosoft. See http://www.geosoft.com/media/uploads/resources/technical-notes/microleveling%20tech%20note.pdf 1)Initial Processing in MagMap2000 -Download base files from INTERMAGNET observatory (http://www.intermagnet.org/apps/dl_data_prel_e.php) -Despike base files and visually inspect for dropouts -Apply bias to DIURNAL (base) readings for GMT to local PDT + longitude diff. from base to survey = 7hrs + 0.22hrs =-24,408sec **NOTE: 0.0666667hr/deg longitude correction -Import .survey files, despike 2)Import to Oasis -Remove periodic sparker spike from raw G882 and G882_diurnal channel using a non-linear filter GX = nlfilt (ex. filter width = 3 data points, filter tolerance = 0.3 nt) 3)Calculated IGRF for G882 data 4)Back calculated Base Magnetometer measurements G882filt-DIURNAL_filt = Fresno_base 5)Calculated IGRF value at base station FRN = 48909.6nT 6)Calculated Total Field (Residual) Anomaly using the following equation: A(x) = [F(x,t) - I(x)] - [FB(t) - IB] where: A(x)is total field anomaly at position x F(x,t) is the G882 reading at time t and position x I(x) is IGRF/DGRF at the G882 FB(t) is the base station reading at time t IB is the IGRF/DGRF at the base station Applying a decorrugation filter "R" and "P" lines only (500m line spacing, line azimuth=44 degrees) Following methodology of Nick Valleau at Geosoft - http://www.geosoft.com/media/uploads/resources/technical-notes/microleveling%20tech%20note.pdf FILTER PARAMETERS for "R" lines Butterworth filter: cutoff wavelength = 2000 (4 x line spacing) filter order = 8 (suggested) high-pass Directional Cosine filter: centre direction = 44 (flight line azimuth) degree of cosine function = 1 (suggested) pass (i.e., pass the features in the specified direction) NOTE: Can't apply low-pass filter to data in Nick's process b/c the cutoff wavelength is calculated using fiducials, which are dependent on boat speed, which is not constant (ex. boat goes faster while only collecting fill-in mag). So, maglev channels are simply sampled from the decor grid. FILTER PARAMETERS for "P" lines Butterworth filter: cutoff wavelength = 2000 (4 x line spacing) filter order = 8 (suggested) high-pass Directional Cosine filter: centre direction = 14 (flight line azimuth) degree of cosine function = 0.5 (suggested) pass (i.e., pass the features in the specified direction) Final processed data in column "maglev_final"
Process_Date: 20130627
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Contact_Person: Janet Watt
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060-5792
Country: US
Contact_Voice_Telephone: 831-460-7565
Contact_Facsimile_Telephone: 831-427-4748
Contact_Electronic_Mail_Address: jwatt@usgs.gov
Process_Step:
Process_Description:
Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed.
Process_Date: 20201019
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Process_Step:
Process_Description:
Edited metadata to correct minor typos and bring it up to PCMSC standards. No data were changed.
Process_Date: 20211013
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Susan Cochran
Contact_Position: Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Contact_Voice_Telephone: 831-460-7545
Contact_Electronic_Mail_Address: scochran@usgs.gov
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Point
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
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: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257
Vertical_Coordinate_System_Definition:
Depth_System_Definition:
Depth_Datum_Name: Local surface
Depth_Resolution: 0.1
Depth_Distance_Units: meters
Depth_Encoding_Method: Attribute values
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: B-04-12-NC_Magnitic
Entity_Type_Definition: Points representing magnetic anomaly level
Entity_Type_Definition_Source: This report
Attribute:
Attribute_Label: Line
Attribute_Definition: Survey line identifier
Attribute_Definition_Source: This report
Attribute_Domain_Values:
Unrepresentable_Domain: Each line contained in the survey has a unique identifier
Attribute:
Attribute_Label: Date
Attribute_Definition: Date of data point collection
Attribute_Definition_Source: This report
Attribute_Domain_Values:
Unrepresentable_Domain: The date the data point was collected
Attribute:
Attribute_Label: Time
Attribute_Definition: Time of data point collection
Attribute_Definition_Source: This report
Attribute_Domain_Values:
Unrepresentable_Domain: The time the data point was collected
Attribute:
Attribute_Label: lon_n83
Attribute_Definition: Longitute of data point
Attribute_Definition_Source: This report
Attribute_Domain_Values:
Unrepresentable_Domain: Longitude of data point in world coordinates
Attribute:
Attribute_Label: lat_n83
Attribute_Definition: Longitute of data point
Attribute_Definition_Source: This report
Attribute_Domain_Values:
Unrepresentable_Domain: Latitude of data point in world coordinates
Attribute:
Attribute_Label: x_n83
Attribute_Definition: X coordinate of data point
Attribute_Definition_Source: This report
Attribute_Domain_Values:
Unrepresentable_Domain: Longitude of data point in NAD83 UTM zone 10N
Attribute:
Attribute_Label: y_n83
Attribute_Definition: Y coordinate of data point
Attribute_Definition_Source: This report
Attribute_Domain_Values:
Unrepresentable_Domain: Latitude of data point in NAD83 UTM zone 10N
Attribute:
Attribute_Label: G882_raw
Attribute_Definition: Raw Magnetic level
Attribute_Definition_Source: This report
Attribute_Domain_Values:
Unrepresentable_Domain: Unprocessed magnetic level at data point
Attribute:
Attribute_Label: G882_DIURNAL
Attribute_Definition: Magnetic level correction applied
Attribute_Definition_Source: This report
Attribute_Domain_Values:
Unrepresentable_Domain: Magnetic level correction applied (see: Precess_Step 4)
Attribute:
Attribute_Label: G882_IGRF
Attribute_Definition:
Magnetic level with International Geomagnetic Reference Field (IGRF) correction applied
Attribute_Definition_Source: This report
Attribute_Domain_Values:
Unrepresentable_Domain:
Magnetic level with International Geomagnetic Reference Field (IGRF) correction applied
Attribute:
Attribute_Label: FRN_base
Attribute_Definition: International Geomagnetic Reference Field at Fresno base
Attribute_Definition_Source: This report
Attribute_Domain_Values:
Unrepresentable_Domain:
Value of International Geomagnetic Reference Field at the Fresno Base at the time data point was collected
Attribute:
Attribute_Label: total_field_anom
Attribute_Definition: Calculated Total Field (Residual) Anomaly
Attribute_Definition_Source: This report
Attribute_Domain_Values:
Unrepresentable_Domain: Magnetic level correction applied (see: Precess_Step 6)
Attribute:
Attribute_Label: maglev_final
Attribute_Definition: Magnetic level Final
Attribute_Definition_Source: This report
Attribute_Domain_Values:
Unrepresentable_Domain:
Magnetic level with directional correction applied (see: Precess_Step 6)
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey - ScienceBase
Contact_Address:
Address_Type: mailing and physical address
Address: Denver Federal Center, Building 810, Mail Stop 302
City: Denver
State_or_Province: CO
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: 1-888-275-8747
Resource_Description: Downloadable magnetic field data
Distribution_Liability:
These data, identified as magnetic field anomaly data, have been approved for release and publication by the U.S. Geological Survey (USGS). Although these data have been subjected to rigorous review and are substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: comma-delimited text
File_Decompression_Technique: No compression applied
Transfer_Size: 6130
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
https://www.sciencebase.gov/catalog/file/get/57044c29e4b0d4e2b7561eda
Network_Resource_Name: https://doi.org/10.5066/F7GT5K8R
Access_Instructions:
Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download a zipped file of data, metadata, and a map of the Chirp tracklines. The second link points to a landing page for the entire data release.
Fees: None
Metadata_Reference_Information:
Metadata_Date: 20211013
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Contact_Person: PCMSC Science Data Coordinator
Contact_Address:
Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Contact_Voice_Telephone: 831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/ScienceBase/DR_F7GT5K8R/B-04-12-NC_Magnetic_metadata.html>
Generated by mp version 2.9.50 on Thu Oct 14 14:47:21 2021