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: 20231014 Title: Summary of event deposit characteristics from 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 (ver. 2.0, October 2023) Edition: 2.0 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, Coordinates of percussion driven gravity cores collected in Alaskan lakes and fjords following the 2018 Anchorage earthquake (ver. 2.0, October 2023): 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 qualitative interpretations of event deposits 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:86380837-b6e8-4d8e-9a94-94bc4309f1ef 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: Pacific Ocean Place_Keyword: Prince William Sound Place_Keyword: Passage Canal Place_Keyword: State of Alaska Place_Keyword: Skilak Lake Place_Keyword: Kenai Lake Place_Keyword: Tustumena Lake Place_Keyword: Chelatna Lake Place: Place_Keyword_Thesaurus: None Place_Keyword: Harriman Fjord 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 Native_Data_Set_Environment: Microsoft Excel (v 16.6) Cross_Reference: Citation_Information: Originator: Caroline A. Schneider Originator: Wayne S. Rasband Originator: Kevin W. Eliceiri. Publication_Date: 2012 Title: NIH Image to ImageJ: 25 years of image analysis. Other_Citation_Details: Schneider, Caroline A., Rasband, Wayne S., and Eliceiri, Kevin W. "NIH Image to ImageJ: 25 years of image analysis." Nature methods 9.7 (2012): 671-675. Online_Linkage: https://doi.org/10.1038/nmeth.2089 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 USGS scientists collecting and processing the data at the end of each workday. 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, 2020-615-FA, 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: Event deposits, defined here as deposits with anomalous character relative to background sediments (and interpreted as turbidites), are identified based mainly on thickness (> ~1 cm) and grain size (coarser), and were sampled for grain-size analysis at 3-mm intervals. Event deposit thicknesses were measured in CT images with the ImageJ software package (Schneider et al., 2012), and for deposits with angular contacts, thicknesses were measured perpendicular to the contact. Errors in turbidite thickness are assigned the CT-scan resolution rounded up to the nearest tenth of a millimeter (i.e., 0.1 mm). 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: 20 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_Event_Deposit_Summary.csv Entity_Type_Definition: Comma-delimited text file containing summary of event deposit data from core samples. Entity_Type_Definition_Source: producer defined Attribute: Attribute_Label: Location Attribute_Definition: Basin Location Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Unique identifier for the basin of interest Attribute: Attribute_Label: Deposit Attribute_Definition: Event deposit identifier Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Unique identifier for the deposit of interest Attribute: Attribute_Label: Varve Year Attribute_Definition: Varve year of event deposit Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Unique identifier for the varve year associated with event deposit of interest Attribute: Attribute_Label: Deposit Thickness Attribute_Definition: Qualitative description of deposit thickness variability. Deposits that lack a sufficient number of observations to accurately assess thickness variability are marked "-". Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Localized, Uniform, and Variable Enumerated_Domain_Value_Definition: Unique identifier associated with deposit of interest describing spatial variability of deposit thicknesses. Localized deposits are observed in a geographically limited area. Uniform deposits are observed to have relatively constant thickness in different sediment cores. Variable deposits are observed to have relatively variable thickness in sediment cores. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: Basal Grain Size Attribute_Definition: Qualitative description of deposit basal grain size Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Coarse and Fine. Enumerated_Domain_Value_Definition: Description of grain size distribution of the deposit's basal section based on radiodensity observations and grain size measurements. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: Basal Sorting Attribute_Definition: Qualitative description of deposit basal grain size sorting. Deposits that lack sufficient resolution and thickness to accurately assess grain size sorting are marked "-". Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: High or Low. Enumerated_Domain_Value_Definition: Grain size sorting character of deposit's basal section. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: Color Attribute_Definition: Qualitative description of deposit color Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Unique identifier associated with deposit of interest Attribute: Attribute_Label: Trigger Attribute_Definition: Qualitative description of interpreted deposit triggering mechanisms Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Earthquake or Flood. Enumerated_Domain_Value_Definition: Interpreted deposit trigger based on sedimentological characteristics. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: Confidence Attribute_Definition: Qualitative description of interpretation confidence of triggering mechanisms based on number of observed sedimentological characteristics consistent with interpreted triggering mechanism. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Unrepresentable_Domain: Unique identifier associated with deposit of interest 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: Event deposit characteristics and grain size data are provided in a comma-delimited text file (2021-612_2020-625_2020-615_Event_Deposit_Summary.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 event deposit characteristics and grain size data. Transfer_Size: 0.0015 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: Event deposit characteristics and grain size data are in .csv format can be viewed with any standard table editing software (for example, Excel, Numbers). Metadata_Reference_Information: Metadata_Date: 20231014 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