Metadata: Identification_Information: Citation: Citation_Information: Originator: Drake M. Singleton Originator: Daniel S. Brothers Originator: Jenna C. Hill Originator: Peter J. Haeussler Originator: Robert C. Witter Publication_Date: 20230706 Title: Cesium-137 concentration data of percussion driven gravity cores collected in Alaskan lakes and fjords following the 2018 Anchorage earthquake Geospatial_Data_Presentation_Form: comma-delimited text Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P924775B 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/P924775B Larger_Work_Citation: Citation_Information: Originator: Drake M. Singleton Originator: Daniel S. Brothers Originator: Jenna C. Hill Originator: Peter J. Haeussler Originator: Robert C. Witter Publication_Date: 2023 Title: Geophysical and core sample data collected in lakes and fjords of southcentral Alaska following the 2018 Anchorage earthquake Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P924775B Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, CA Publisher: U.S. Geological Survey Other_Citation_Details: Suggested Citation: Singleton, D.M., Brothers, D.S., Hill, J.C., Haeussler, P.J., and Witter, R.C., 2023, Geophysical and core sample data collected in lakes and fjords of southcentral Alaska following the 2018 Anchorage earthquake: U.S. Geological Survey data release, https://doi.org/10.5066/P924775B. Online_Linkage: https://doi.org/10.5066/P924775B Description: Abstract: This dataset includes Cesium-137 concentration data from sediment cores collected from lacustrine and fjord basins in southcentral Alaska following the 2018 Anchorage earthquake. The cores were collected with a percussion driven gravity corer for use in regional hazard assessments relating to Alaska’s seismic hazard. Purpose: Identification of fault-related submarine hazards is a primary mission of the USGS Coastal and Marine Hazards and Resources Program. Intraslab earthquakes, which occur at depth within the subducting plate, can cause intense shaking at the Earth’s surface, but do not cause surficial faulting or result in significant land level changes. The seismic shaking associated with intraslab earthquakes can remobilize subaqueous sediment and lead to gravity driven sediment flows, potentially creating a record of past shaking from these events. To gain a better understanding of the conditions that produce seismically triggered deposits in subaqueous basins the USGS collected Chirp seismic and sediment cores from several lakes and fjords following the M7.1 2018 Anchorage earthquake. These data are intended to further our understand of geologic hazard in southcentral Alaska, improve risk assessments for local communities and critical infrastructure, and to provide data for future research on regional paleoseismic records in southcentral Alaska. Supplemental_Information: Additional information about the field activities from which these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-612-FA https://cmgds.marine.usgs.gov/fan_info.php?fan=2020-615-FA https://cmgds.marine.usgs.gov/fan_info.php?fan=2020-625-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: 20200808 Ending_Date: 20210622 Currentness_Reference: Ground conditions at time data were collected Status: Progress: Complete Maintenance_and_Update_Frequency: none Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -151.490850 East_Bounding_Coordinate: -148.537050 North_Bounding_Coordinate: 62.520180 South_Bounding_Coordinate: 60.071108 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:ebe581ba-2d9b-4faf-a7e9-15e496dcdd6e Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: inlandWaters Theme_Keyword: oceans Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: Data Categories for Marine Planning Theme_Keyword: substrate Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: core analysis 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 Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: State of Alaska Place_Keyword: Tustumena Lake Place_Keyword: Chelatna Lake 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(s) of the dataset and in products derived from these data. 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 Data_Set_Credit: USGS PCMSC physical scientist Thomas Lorenson Native_Data_Set_Environment: Microsoft Excel (v. 16.6) Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Quality control of attribute accuracy was conducted during field data collection and processing workflows. Logical_Consistency_Report: Data received review from technicians and/or a project scientist at the end of each day. 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. Lineage: Process_Step: Process_Description: Cores were collected using a UWITEC percussion driven hammer core during U.S. Geological Survey cruises 2021-612-FA and 2020-625-FA. The cores were transported back to the USGS Pacific Coastal and Marine Science Center core lab for subsequent analyses. Process_Date: 20210622 Process_Step: Process_Description: In the PCMSC core lab, cores were split and sampled at 2 cm intervals for Cesium-137 (Cs-137) radionuclide analysis. Sampled sediment was dried at 60 degrees Celsius before analysis. Radionuclide counts were done in house at PCMSC in a low-background, high-efficiency, well-shaped gamma ray detector with counts that were calibrated using certified reference materials (IAEA-300). Process_Date: 20211030 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: 33 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: WGS 1984 Ellipsoid_Name: WGS 84 Semi-major_Axis: 6378137.0 Denominator_of_Flattening_Ratio: 298.257224 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: 2021-612_2020-625_2020-615_Cs137.csv Entity_Type_Definition: Comma-delimited text file containing Cesium-137 concentration for core samples Entity_Type_Definition_Source: producer defined Attribute: Attribute_Label: Core ID Attribute_Definition: Location name, year collected, and core ID (for example, SK20-01A is Skilak Lake 2020 core 01) Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Unique identifier for the sample used given in the field Attribute: Attribute_Label: Sample Interval Attribute_Definition: Depth interval in core over which sediment was sampled from for each measurement. Sample interval thickness is 2 cm, on average. Depths relative to top of sediment. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 38 Attribute_Units_of_Measure: cm (centimeters) Attribute: Attribute_Label: Mid Depth Attribute_Definition: Mid-point of depth interval in core that each measurement was taken. Depths relative to top of sediment. Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 34 Attribute_Units_of_Measure: cm (centimeters) Attribute_Measurement_Resolution: 1 Attribute: Attribute_Label: Cs (dpm g-1) Attribute_Definition: Cesium-137 concentration in disintegrations per minute (dpm) per gram (g). Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 4.095 Attribute_Units_of_Measure: Disintegrations per minute (dpm) per gram (g) Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: Sigma Attribute_Definition: 95 percent confidence error in Cesium-137 concentration in Disintegrations per minute (dpm) per gram (g). Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 0.76 Attribute_Units_of_Measure: Disintegrations per minute (dpm) per gram (g) Attribute_Measurement_Resolution: 0.01 Overview_Description: Entity_and_Attribute_Overview: The first line of the csv file is a header line. Location information for each sediment core can be found in the 2021_612_2020_625_2020_615_core_nav shapefile included in this data release. Entity_and_Attribute_Detail_Citation: U.S. Geological Survey 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: Cesium-137 concentration data are provided in a comma-delimited text file (2021-612_2020-625_2020-615_Cs137.csv) accompanied by CSDGM FGDC-compliant metadata. 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: comma-delimited text Format_Version_Date: 2016 Format_Information_Content: Comma-delimited text file of Cesium-137 concentration data. Transfer_Size: 0.0009 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.5066/P924775B Access_Instructions: Data can be downloaded using the Network_Resource_Name link and scrolling to the Environmental Data section. Fees: None. Technical_Prerequisites: Cesium-137 data in .csv format can be viewed with any standard table editing software (for example, Excel, Numbers). Metadata_Reference_Information: Metadata_Date: 20230706 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