Metadata: Identification_Information: Citation: Citation_Information: Originator: Jenna C. Hill Originator: Nora M. Nieminski Originator: SeanPaul M. La Selle Originator: Janet T. Watt Originator: Daniel S. Brothers Originator: Mary L. McGann Originator: Travis V. Alongi Originator: Gerry A. Hatcher Originator: Brandon M. Nasr Originator: Jennifer A. McKee Originator: Peter Dal Ferro Publication_Date: 20240327 Title: Computed tomography (CT) scans of sediment cores collected offshore southern Cascadia, during field activity 2019-643-FA Geospatial_Data_Presentation_Form: raster digital data Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P1E8GDZH 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/P9BG6ZAD Larger_Work_Citation: Citation_Information: Originator: Jenna C. Hill Originator: Nora M. Nieminski Originator: SeanPaul M. La Selle Originator: Janet T. Watt Originator: Daniel S. Brothers Originator: Mary L. McGann Originator: Travis V. Alongi Originator: Gerry A. Hatcher Originator: Brandon M. Nasr Originator: Jennifer A McKee Originator: Peter Dal Ferro Publication_Date: 2024 Title: Sediment core data from offshore southern Cascadia - USGS field activity 2019-643-FA Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P1E8GDZH Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, California Publisher: U.S. Geological Survey Other_Citation_Details: Suggested Citation: Hill, J.C., Nieminski, N.M., La Selle, S.M., Watt, J.W., Brothers, D.S., McGann, M.L., Alongi, T.V., Hatcher, G.A., Nasr, B.M., McKee, J.A., and Dal Ferro, P., 2024, Sediment core data from offshore southern Cascadia during field activity 2019-643-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P1E8GDZH. Online_Linkage: https://doi.org/10.5066/P1E8GDZH Description: Abstract: This dataset includes computed tomography (CT) scan imagery of sediment cores collected in southern Cascadia (offshore northern California) aboard the M/V Bold Horizon in September-October 2019. Purpose: As part of a multi-year project focused on characterizing offshore marine geohazards (tsunamis, earthquakes, and landslides), the U.S. Geological Survey (USGS) Coastal and Marine Hazards and Resources Program is collaborating with the Bureau of Ocean Energy Management (BOEM) to conduct research offshore northern California. This region marks the southern extent of the Cascadia Subduction Zone, which is a major tectonic boundary that is prone to megathrust earthquakes and includes a BOEM offshore wind area of interest. To gain a better understanding of the geologic hazards of the region, improve risk assessments for local communities and critical infrastructure, and to provide data for future research on regional tectonic, sedimentary, and geomorphic evolution of coastal California, the USGS collected sediment cores to enable a detailed investigation of southern Cascadia's geologic history and ongoing activity. 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. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20190927 Ending_Date: 20191010 Currentness_Reference: Ground conditions at time data were collected Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -125.25388241 East_Bounding_Coordinate: -124.07787323 North_Bounding_Coordinate: 41.76311745 South_Bounding_Coordinate: 40.76311745 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:aeb4b38f-4708-4e1d-a23f-370c18c6d36a Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: core analysis Theme_Keyword: ocean processes Theme_Keyword: sediment transport Theme_Keyword: geospatial datasets Theme: Theme_Keyword_Thesaurus: Data Categories for Marine Planning Theme_Keyword: substrate Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords Theme_Keyword: sediment 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: Department of the Interior Theme_Keyword: DOI Theme_Keyword: field activity number 2019-643-FA Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: Pacific Ocean Place_Keyword: State of California Place_Keyword: Humboldt County Place_Keyword: Eureka Access_Constraints: None. Please see 'Distribution Info' for details. 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(s) of the dataset and in products derived from these data. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: PCMSC Science Data Coordinator Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Address: Address_Type: mailing and physical Address: 2885 Mission Street City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Contact_Voice_Telephone: 831-427-474 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: JPC30_ct_preview.jpg Browse_Graphic_File_Description: Example CT image of a section of core JPC-30. Browse_Graphic_File_Type: JPG Native_Data_Set_Environment: Computed tomography (CT) images were obtained with a Geotek Rotating X-ray CT (RXCT) system. Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Quality control of attribute accuracy was conducted during field data collection and processing workflows. No formal attribute accuracy tests were conducted. Logical_Consistency_Report: No formal logical consistency 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: Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Core depth values are relative to the top of sediment in the uppermost core section. Coring-induced compaction, if any, was not determined. No formal vertical accuracy tests were conducted. Lineage: Process_Step: Process_Description: Cores were collected aboard M/V Bold Horizon using a U.S. Geological Survey (USGS) jumbo piston corer (JPC) on cruise 2019-643-FA. The JPC system consisted of a 2500-lb head weight, 3.43-inch diameter barrel, and polybutyrate liner. The JPC trigger arm was set up to collect a trigger core (TC) associated with each JPC (if successful). Gravity cores (GC) were collected with the same JPC system in two localities. JPCs and GCs were extruded and sectioned at sea. The cores were then transported back to the USGS Pacific Coastal and Marine Science Center. Process_Date: 2019 Process_Step: Process_Description: CT scans were acquired at the USGS Pacific Coastal and Marine Science Center core facility using a Geotek Rotating X-Ray CT (RXCT) Scanner system, running acquisition software version XCT4. Rotational x-ray images were acquired with a Thermo Kevex PSX10-65W x-ray source every 0.2 degrees at 125 kilovolts (kV) and 250 microamperes. Core segments were scanned individually. Rotational images were reconstructed into axial slice TIFFs using Geotek’s Reconstructor Software. Once reconstructed, the axial slice TIFFs were imported into GeoTek's Image Viewer software and representative two-dimensional orthogonal views were selected from the coronal (XZ) and saggital (YZ) planes. A ruler was added to the orthogonal TIFF images using the GeoTek Add Ruler v1.4 software and represents in-section depth in centimeters. TIFFs are provided in 16-bit unsigned integer, single channel format. File names correspond to the names of each core segment. For example ‘2019_643_FA_GC19_02_XZView.tif’ corresponds to the coronal view of the second segment of the gravity core ‘GC19’. A list of orthogonal CT TIFF images is included in this data release in the 2019-643-FA_cores.csv file. Process_Date: 2020 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Point Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point Point_and_Vector_Object_Count: 338 Spatial_Reference_Information: Vertical_Coordinate_System_Definition: Depth_System_Definition: Depth_Datum_Name: Local surface Depth_Resolution: 0.1 Depth_Distance_Units: centimeters Depth_Encoding_Method: Attribute values Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: 2019-643-FA_core_ct.zip Entity_Type_Definition: A zip file containing 338 TIFF files of CT images and their respective software-proprietary XML files. Two TIFF files containing downcore CT images of coronal (XZ) and saggital (YZ) views are provided for each scanned core section. Entity_Type_Definition_Source: Producer defined Attribute: Attribute_Label: orthogonal CT image metadata XML file Attribute_Definition: This Geotek software-proprietary XML file contains information on CT scan acquisition settings and reconstruction settings. The following attributes and example attribute values are provided: giCTOrthogonalView flo17_vc04_233_400cm 1 9.07 56.83 158.0 104.3 104.3 946 5928 Thermo Kevex PSX10-65W 1 flo17_vc04_2333_400cm.tif 115 450.1 77 221.73 575.01 2x2 0 Attribute_Definition_Source: producer defined Attribute_Domain_Values: Unrepresentable_Domain: These Geotek software-proprietary XML files contain information on CT scan acquisition settings and image scaling information. The values in the example provided may be different for each scan. Please contact the PCMSC data coordinator for more information on the contents of these XML files. Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: GS ScienceBase Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing address Address: Denver Federal Center, Building 810, Mail Stop 302 City: Denver State_or_Province: CO Postal_Code: 80225 Country: United States Contact_Voice_Telephone: 1-888-275-8747 Contact_Electronic_Mail_Address: sciencebase@usgs.gov Resource_Description: CT images are provided in a zip archive (2019-643-FA_cores_ct.zip) with CSDGM FGDC compliant metadata. Please contact the PCMSC Data Coordinator about availability. 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: TIFF, XML Format_Version_Number: Geotek RXCT Scanner system, software version XCT4 Format_Information_Content: Zip file contains CT core imagery in TIFF format and associated proprietary metadata in XML format. File_Decompression_Technique: Zip file may be decompressed with any zip utility (e.g., 7zip, WinZip, Archive Utility). Transfer_Size: 4800 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.5066/P1E8GDZH Access_Instructions: Data can be downloaded using the Network_Resource_Name link and scrolling to 2019-643-FA_cores_ct.zip in the Imagery Data section. Fees: None. Technical_Prerequisites: CT images can be viewed with any standard image software. Proprietary metadata XML files can be viewed with any standard text editing software. Metadata_Reference_Information: Metadata_Date: 20240327 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