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