Chirp seismic-reflection and navigation data collected in Alaskan lakes and fjords following the 2018 Anchorage earthquake

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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: Drake M. Singleton
Originator: Daniel S. Brothers
Originator: Jenna C. Hill
Originator: Peter J. Haeussler
Originator: Robert C. Witter
Publication_Date: 20230706
Title:

Chirp seismic-reflection and navigation data collected in Alaskan lakes and fjords following the 2018 Anchorage earthquake

Geospatial_Data_Presentation_Form:

seismic-reflection data in SEG-Y format and navigation polylines in shapefile format

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:

Chirp seismic-reflection data and associated navigation files were collected from lacustrine and fjord basins in southcentral Alaska following the 2018 Anchorage earthquake. These data were collected from a 25-foot Boston Whaler (R/V Moose Dancer),18-foot cataraft (R/V Enterprise), and the R/V Alaskan Gyre in the summers of 2020 and 2021 for use in regional hazard assessments relating to Alaska’s seismic hazards.

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.
Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set 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: 20200808
Ending_Date: 20210622

Currentness_Reference: Ground conditions at time data were collected

Status:

Progress: In work
Maintenance_and_Update_Frequency: As needed

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:19a6dc80-2f35-439b-a52a-87f32de63f5b

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: inlandWaters
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: sub-bottom profiling
Theme_Keyword: geospatial datasets

Theme:

Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords
Theme_Keyword: data processing
Theme_Keyword: seismic reflection profiling
Theme_Keyword: Global Positioning System observations

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: seismic reflection

Place:

Place_Keyword_Thesaurus: Geographic Names Information System
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

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. 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

Data_Set_Credit:

USGS PCMSC Marine Facility personnel Rachel Marcuson assisted with Chirp seismic data acquisition.

Native_Data_Set_Environment:

Field seismic data were collected with EdgeTech Discover acquisition software and processed using SioSeis (V 2022.1.2) on a MacOS operating system. Seismic tracklines were processed using ArcGIS Pro (v. 2.9.1) on a Windows 10 operating system.

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:

All SEG-Y and navigation data were derived from the same instruments and processing workflows. Paired navigation and SEG-Y files have corresponding filenames and/or corresponding names indicated in shapefile attribute fields.

Completeness_Report:

Profiles Kel20-04 and Kel20-06 collected during 2020-625-FA experienced power loss in the tow-fish data cable resulting in loss of recorded data for a short period of time. Users are advised to read the rest of the metadata record carefully for additional details.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

A Hemisphere V110 GPS system was used for obtaining navigation data during the cruise with a stated accuracy of 0.6 meters (95 percent confidence). Horizontal position coordinates in WGS 84/UTM zone 6N reference frame are located in index position 73-80 within the segy header.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

Two-way travel time in milliseconds referenced to sea level is provided in the SEG-Y files. Referencing two-way travel time to sea level is accomplished via an internal pressure logger within the Chirp towfish with a stated accuracy of approximately 0.001 psi which is converted to water depth accurate to within approximately 1 cm. If this depth information is recorded, it is populated in the receiver group elevation header in the SEG-Y files (bytes 41-44). Data collected during Field Activity 2021-612-FA does not record internal pressure logger information, but instead was collected from fixed pole position at a water depth of 60 centimeters.

Lineage:

Process_Step:

Process_Description:

Field seismic data collection 2020-625-FA: Seismic data were collected onboard the R/V Moose Dancer using an EdgeTech SB-424 Chirp sub-bottom profiler. Field data were collected in JSF format. Navigation data were collected simultaneously with a Hemisphere V110 GPS and saved into the seismic headers during acquisition. Profiles Kel20-04 and Kel20-06 collected during 2020-625-FA experienced power loss in the tow-fish data cable resulting in loss of recorded data for a short period of time.

Process_Date: 20200808

Process_Step:

Process_Description:

Field seismic data collection 2020-615-FA: Seismic data were collected onboard the R/V Alaskan Gyre using an EdgeTech SB-516 Chirp sub-bottom profiler. Field data were collected in JSF format. Navigation data were collected simultaneously with a Hemisphere V110 GPS and saved into the seismic headers during acquisition.

Process_Date: 20200912

Process_Step:

Process_Description:

Field seismic data collection 2021-612-FA: Seismic data were collected onboard the R/V Enterprise using an EdgeTech SB-216 Chirp sub-bottom profiler. Field data were collected in JSF format. Navigation data were collected simultaneously with a Hemisphere V110 GPS and saved into the seismic headers during acquisition.

Process_Date: 20210612

Process_Step:

Process_Description:

The following processing flow was carried out in SioSeis (v. 2022.1.2) to process field data output to SEG-Y files: (1) Trace envelope data from field-collected JSF files were converted to SEG-Y format.

Process_Date: 20220601

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: 39

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.000001
Longitude_Resolution: 0.000001
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

Vertical_Coordinate_System_Definition:

Depth_System_Definition:

Depth_Datum_Name: Local surface
Depth_Resolution: 0.1
Depth_Distance_Units: meters
Depth_Encoding_Method: Attribute values

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: 2021_612_2020_625_2020_615_chirp_nav.shp
Entity_Type_Definition: Chirp seismic navigation in polyline format
Entity_Type_Definition_Source: U.S. Geological Survey

Attribute:

Attribute_Label: FID
Attribute_Definition: Internal feature number
Attribute_Definition_Source: Esri
Attribute_Domain_Values:

Unrepresentable_Domain: Sequential unique integers automatically generated

Attribute:

Attribute_Label: Shape
Attribute_Definition: Feature Geometry
Attribute_Definition_Source: Esri
Attribute_Domain_Values:

Unrepresentable_Domain: Feature shape automatically generated

Attribute:

Attribute_Label: Field1
Attribute_Definition:

USGS Pacific Coastal and Marine Science Center (PCMSC) field activity identifier followed by line number. For Example, 2021-612_CH21_59 is line CH21_59 collected during field activity number 2021-612-FA.

Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:

Unrepresentable_Domain:

Unique seismic line number appended to field activity ID generated by the USGS

Attribute:

Attribute_Label: Length
Attribute_Definition: Calculated length of the line in kilometers
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1.07490
Range_Domain_Maximum: 11.00757
Attribute_Units_of_Measure: kilometers
Attribute_Measurement_Resolution: 0.00001

Overview_Description:

Entity_and_Attribute_Overview:

Zip archive of seismic shots with time stamp in standard SEG-Y format. Data for individual seismic lines follow file name format of Field-Activity-Number_LINE#.sgy. For example, 2021-612_CH21_59.sgy is line number CH21_59 collected during field activity 2021-612-FA.

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:

Seismic data are available in SEG-Y format (2021-612_2020-625_2020-615_chirp.zip) with navigation provided in a shapefile format (2021-612_2020-625_2020-615_chirp.nav.zip) and 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: SEG-Y
Format_Version_Number: SEG-Y rev 1
Format_Information_Content:

Zip file contains processed seismic data per single navigation line. Data for individual seismic lines follow file name format of Field-Activity-Number_LINE#.sgy.

File_Decompression_Technique:

Zip files may be decompressed with any zip utility (for example, 7zip, WinZip, Archive Utility).

Transfer_Size: 4400

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 Seismic Data section.

Fees: None.

Technical_Prerequisites:

Viewing SEG-Y data requires specialized software. A list of common SEG-Y processing and visualization software is available at http://www.oilfieldwiki.com/wiki/List_of_free_geophysics_software. Shapefile navigation data can be viewed using any Geographic Information System software (for example, ArcGIS, QGIS).

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

This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/CMGDS_DR_tool/DR_P924775B/2021-612_2020-625_2020-615_seismic_metadata_052223.06-13-2023.html>