Computed Tomography (CT) scans of sediment cores collected from Montague Island, AK

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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: Robert C. Witter
Originator: SeanPaul M. La Selle
Originator: Jessica DePaolis
Originator: Peter J. Haeussler
Originator: Adrian M. Bender
Originator: Janet H. Curran
Originator: Tina Dura
Publication_Date: 20240326
Title:

Computed Tomography (CT) scans of sediment cores collected from Montague Island, AK

Geospatial_Data_Presentation_Form: raster digital data
Series_Information:

Series_Name: data release
Issue_Identification: DOI:10.5066/P13RVDJZ

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/P13RVDJZ
Larger_Work_Citation:

Citation_Information:

Computed Tomography (CT) scans of sediment cores collected from Montague Island, AK

Series_Information:

Series_Name: data release
Issue_Identification: DOI:10.5066/P13RVDJZ

Publication_Information:

Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, CA
Publisher: U.S. Geological Survey

Other_Citation_Details:

Suggested Citation: Witter, R.C., La Selle, S.M., DePaolis, J., Haeussler, P.J., Bender, A.M., Curran, J.H., Dura, T., 2024, Computed Tomography (CT) scans of sediment cores collected from Montague Island, AK: U.S. Geological Survey data release, https://doi.org/10.5066/P13RVDJZ.

Online_Linkage: https://doi.org/10.5066/P13RVDJZ

Description:

Abstract:

This dataset includes computed tomography (CT) scans of sediment cores collected from coastal environments on Montague Island, Alaska. The cores were collected with hand driven peat augers to assess environmental changes related to tectonic uplift caused by historic and prehistoric earthquakes.

Purpose:

The 2017 USGS Subduction Zone Science plan includes the key priority to characterize past hazardous events to forecast the future using onshore and offshore clues. Such clues include coastal evidence of sudden vertical land-level changes caused by large earthquakes along subduction zones. The computed tomography scans of sediment cores from lagoons uplifted >3 m in the 1964 earthquake along the coast of Montague Island aid in interpreting changes in deposition environment over the past several thousand years, which may record evidence for past episodes of earthquake uplift.

Supplemental_Information:

Cores were collected by USGS, Alaska Science Center; cores were subsequently analyzed and archived by collaborating scientists at Virginia Tech. 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: 20190710
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: -147.32948
East_Bounding_Coordinate: -147.30783
North_Bounding_Coordinate: 60.17820
South_Bounding_Coordinate: 60.19528

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:24aa4f3d-6d6d-444c-aa06-163be136bf19

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificInformation

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: core analysis
Theme_Keyword: earthquakes
Theme_Keyword: paleoseismology

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: Earthquake Hazards Program
Theme_Keyword: Alaska Science Center
Theme_Keyword: Department of the Interior
Theme_Keyword: DOI

Place:

Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: State of Alaska
Place_Keyword: Montague Island
Place_Keyword: Chugach Census Area
Place_Keyword: Prince William Sound

Place:

Place_Keyword_Thesaurus: None
Place_Keyword: Chugach National Forest

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: montague_ct_preview.png
Browse_Graphic_File_Description:

Preview of a CT image from core 19HL-24, with a false colormap applied to CT intensity values.

Browse_Graphic_File_Type: PNG

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 surface at the time of core collection. Coring-induced compaction, if any, was not determined. No formal vertical accuracy tests were conducted.

Lineage:

Process_Step:

Process_Description:

Sediment cores were collected from coastal environments on Montague Island, Alaska using a hand-driven peat sampler at two sites: 'Hidden Lagoons' and 'Crescent'. At each core site, two adjacent bore holes were used to sample sediment in 50 cm intervals. Coring alternated between the two bore holes to avoid sampling the approximately 7 cm of disturbed sediment induced by the “nose” at the bottom of the peat sampler. After core extraction, sediment in the auger was transferred to an approximately 5 cm diameter plastic sleeve (50 cm long, 2 inch diameter polyvinyl chloride (PVC) pipe cut lengthwise) and wrapped in plastic. Sampling depths were targeted to bracket specific stratigraphic layers. The cores in this data release therefore do not represent the entire stratigraphic sequence at each core site. Cores were transported back to the USGS Pacific Coastal and Marine Science Center core lab for subsequent CT analyses.

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 130 kilovolts (kV) and 308 microamperes. Core segments were scanned in batches of two to three segments. 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 a representative two-dimensional orthogonal view was selected. TIFFs are provided in 16-bit unsigned integer, single channel format. Scaling information is embedded in the TIFF files and also provided in the associated XML files. File names correspond to the names of the cores within each scan. For example, ‘montague_ct_10HL-22.tif' corresponds to the CT image of core segments from the core location '10HL-22'. 'HL' refers to the Hidden Lagoon site, while 'CR' refers to the 'Crescent' site. The support file, 'montague_ct_supportfile.pdf' provided in this data release illustrates the position of each individual core segment in the CT scan images.

Process_Date: 2019

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: 6

Spatial_Reference_Information:

Vertical_Coordinate_System_Definition:

Depth_System_Definition:

Depth_Datum_Name: Local surface
Depth_Resolution: 1.0
Depth_Distance_Units: centimeters
Depth_Encoding_Method: Attribute values

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: montague_ct.zip
Entity_Type_Definition:

A zip file containing 6 TIFF files of CT images and their respective software-proprietary XML files.

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: <geotek-image> <image-type>giCTOrthogonalView</image-type> <coreID>19CR-10</coreID> <section-number>1</section-number> <physical-width>7.55</physical-width> <physical-height>101.23</physical-height> <physical-top>0.01</physical-top> <pixels-per-CM>125</pixels-per-CM> <horizontal-resolution>125</horizontal-resolution> <pixel-width>944</pixel-width> <scan-lines>12606</scan-lines> <comments></comments> <camera-name>Thermo Kevex PSX10-65W</camera-name> <average-of>1</average-of> <filename>montague_ct_10CR-10-02.tif</filename> <x-ray-voltage>130</x-ray-voltage> <x-ray-current>308.5</x-ray-current> <x-ray-spot-size>58</x-ray-spot-size> <source-object-distance>199.73</source-object-distance> <source-detector-distance>630.01</source-detector-distance> <detector-CCD-mode>2x2</detector-CCD-mode> <image-enhancement-filter>Enabled=False,WindowCount=2,Window=400,SigmaA=0.1,SigmaV=0.0005,Weight=0.4,Window=100,SigmaA=0.1,SigmaV=0.0005,Weight=1,Reduction=0.85</image-enhancement-filter> <is-a-sync-scan-image>0</is-a-sync-scan-image> </geotek-image>

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_Organization_Primary:

Contact_Organization: U.S. Geological Survey - CMGDS

Contact_Address:

Address_Type: mailing address
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: Santa Cruz
Country: United States

Contact_Voice_Telephone: 831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov

Resource_Description:

CT images are provided in a zip archive (montague_ct.zip) with CSDGM FGDC compliant metadata. Please contact the PCMSC Data Coordinator about availability of full 3D CT scan volumes.

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: 119

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: https://doi.org/10.5066/P13RVDJZ

Access_Instructions:

Data can be downloaded using the Network_Resource_Name link and scrolling to montague_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: 20240329
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/CMGDS_DR_tool/DR_P13RVDJZ/montague_ct_metadata.html>