Metadata: Identification_Information: Citation: Citation_Information: Originator: Alicia F. Balster-Gee Originator: Jenna C. Hill Originator: Janet T. Watt Originator: Daniel S. Brothers Originator: Nora M. Nieminski Originator: Travis Alongi Originator: Gerald A. Hatcher Originator: Brandon Nasr Publication_Date: 20230720 Title: Multichannel minisparker seismic-reflection data collected offshore Northern California during USGS field activity 2019-643-FA Geospatial_Data_Presentation_Form: seismic-reflection data in SEG-Y format Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P998EC72 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/P998EC72 Larger_Work_Citation: Citation_Information: Originator: Alicia F. Balster-Gee Originator: Jenna C. Hill Originator: Janet T. Watt Originator: Daniel S. Brothers Originator: Nora M. Nieminski Originator: Travis Alongi Originator: Gerald A. Hatcher Originator: Brandon Nasr Publication_Date: 2023 Title: Multichannel minisparker seismic-reflection and chirp subbottom data collected offshore Northern California during USGS field activity 2019-643-FA Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P998EC72 Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, CA Publisher: U.S. Geological Survey Other_Citation_Details: Suggested Citation: Balster-Gee, A.F., Hill, J.C., Watt, J.T., Brothers, D.S., Nieminski, N.M., Alongi, T., Hatcher, G.A., and Nasr, B., 2023, Multichannel minisparker seismic-reflection and chirp subbottom data collected offshore Northern California during USGS field activity 2019-643-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P998EC72 Online_Linkage: https://doi.org/10.5066/P998EC72 Description: Abstract: High-resolution multichannel seismic (MCS) data were collected by the U.S. Geological Survey in 2019 offshore Humboldt County of northern California to expand data coverage along the southern Cascadia Margin. Purpose: This dataset contains processed multichannel seismic-reflection data collected by the U.S. Geological survey during field activity 2019-643-FA aboard the M/V Bold Horizon. Data were accquired to characterize offshore faults and to study sediment distribution. MCS data were collected coincidently with chirp subbottom data and were used to determine sediment core targets for marine geohazard studies. These data and information are intended for science researchers, students, 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=2019-643-FA Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the dataset in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20190927 Ending_Date: 20191010 Currentness_Reference: ground condition at time data were collected Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -124.71130 East_Bounding_Coordinate: -124.27460 North_Bounding_Coordinate: 41.573364 South_Bounding_Coordinate: 40.655668 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:8902957d-32bb-4384-8277-cbdfcc4c7609 Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans Theme_Keyword: geoscientificInformation Theme_Keyword: location Theme: Theme_Keyword_Thesaurus: Data Categories for Marine Planning Theme_Keyword: substrate Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: marine geophysics Theme_Keyword: geospatial datasets Theme_Keyword: sub-bottom profiling Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords Theme_Keyword: seismic methods Theme_Keyword: seismic reflection profiling Theme_Keyword: data processing Theme: Theme_Keyword_Thesaurus: None 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_Keyword: field activity number 2019-643-FA Theme_Keyword: seismic navigation Theme_Keyword: seismic reflection Theme_Keyword: SEG-Y traces Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: Pacific Ocean Place_Keyword: State of California Place_Keyword: State of Oregon Place_Keyword: Eureka Place_Keyword: Trinidad Place_Keyword: Klamath Place_Keyword: Crescent City Place_Keyword: Eel River Place_Keyword: Mad River Place_Keyword: Little River Place_Keyword: Klamath River Place: Place_Keyword_Thesaurus: NGA GEOnet Names Server (GNS) Place_Keyword: Eel Canyon Place_Keyword: Trinidad Canyon Access_Constraints: None Use_Constraints: USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator of the dataset and in products derived from these data. This information is not intended for navigation purposes. 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 Browse_Graphic: Browse_Graphic_File_Name: 2019-643-FA.MCS.preview.png Browse_Graphic_File_Description: Map of MCS profiles acquired during USGS field activity 2019-643-FA. Browse_Graphic_File_Type: PNG Data_Set_Credit: Data collection efforts were supported in part by an Interagency Agreement (IAA) between the Bureau of Ocean Energy Management (BOEM) and the U.S. Geological Survey. The authors acknowledge the crew of the M/V Bold Horizon and those involved in in survey planning and execution. Native_Data_Set_Environment: SEG-Y processing was conducted in Shearwater’s Reveal seismic software (https://www.shearwatergeo.com/4/reveal-software) version 10.4.2021. QGIS-LTR (version 3.21, https://www.qgis.org/en/site/) was used to produce the navigation trackline shapefile and preview image. Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Quality control was conducted during acquisition. Some seismic profiles have gaps in them due to system crashes or intentional shutdowns as required, under terms of our operating permit, to protect marine mammals. Minor swell correction artifacts exist at line starts and ends as well as in areas where seafloor amplitudes are low. Logical_Consistency_Report: Quality control was conducted during acquisition and processing to ensure consistency of SEG-Y header navigation and seismic-reflection data that matches bathymetry along the tracklines. Navigation data are available as a trackline shapefile in the ‘Data Files’ section. Trackline navigation combines SEG-Y line parts into a single-track line (47 tracklines and 66 SEG-Y files, including parts). 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: +/- 0.6m 95 percent confidence (DGPS) (http://dev.wr.usgs.gov/idb/media/service_materials/2022/12/07/101121522789/Hemisphere_V100specsheet.pdf) Lineage: Process_Step: Process_Description: Raw SEG-D format seismic shots were imported into Shearwater Reveal seismic software for processing. Navigation data were converted to UTM zone 10N and offset geometry was calculated, and common midpoint (CMP) were binned at 3.125-meter intervals. The following processing steps were applied; 50-Hz highpass Butterworth filter, 80-120-1100-1500Hz bandpass filter, despike, top mute, FK filter, velocity semblance analysis, normal moveout, pre-stack spiking deconvolution, 80-120-1100-1500Hz bandpass filter, trim statics, median gather filter, stack, bottom mute, trace kills, phase shift time migration at 1400m/s, and 200ms automatic gain control application. Processed data were exported to SEG-Y format with standard header byte locations. Common Midpoint (CMP) X and Y navigation points are written to header bytes 181 and 185 in UTM zone 10N coordinates. SEG-Y data files were compressed into the zip file 2019-643-FA.mcs.segy.zip. Process_Date: 20210225 Spatial_Data_Organization_Information: Indirect_Spatial_Reference: Horizontal X and Y locations for the seismic profile locations are provided and stored in the SEG-Y data trace headers in header bytes 181 and 185 locations. Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: WGS 1984 UTM Zone 10N Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -123.0 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000.0 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.0001 Ordinate_Resolution: 0.0001 Planar_Distance_Units: Meter Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: Seismic Shots with Time Stamp in standard SEG-Y file format Entity_and_Attribute_Detail_Citation: Society of Exploration Geophysicists (SEG) Technical Standards, available for download at http://seg.org/Publications/SEG-Technical-Standards Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey - CMGDS 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 Resource_Description: SEG-Y data are available in the zip file 2019-643-FA.mcs.zip that contains 43 standard SEG-Y format files of seismic traces with time stamp (Society of Exploration Geophysicists (SEG) Technical Standards, available for download at http://seg.org/Publications/SEG-Technical-Standards). SEG-Y files are named 2019-643-FA.##.migx.sgy where ## is the line name and 2019-643-FA is the USGS field activity identifier. Distribution_Liability: Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by 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. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: SEG-Y Format_Version_Number: SEG-Y rev 1 Format_Information_Content: Zip file contains the processed seismic data per navigation line. File_Decompression_Technique: The zip file can be decompressed with any zip utility (for example, 7zip, Keka, WinZip). Transfer_Size: 69000 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.5066/P998EC72 Access_Instructions: Data and metadata can be downloaded using the Network_Resource_Name link and scrolling down to the sparker data section. 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; VISTA by Seismic Image Software; SeiSee by Dalmorneftegeophysica (DMNG); amongst others. Metadata_Reference_Information: Metadata_Date: 20230720 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