Geologic Inputs for the 2023 Alaska Update to the U.S. National Seismic Hazard Model (NSHM)

Identification_Information:

Citation:

Citation_Information:

Originator: Bender, Adrian M. (ORCID: 0000-0001-7469-1957)
Originator: Haeussler, Peter J. (ORCID: 0000-0002-1503-6247)
Originator: Powers, Peter M. (ORCID: 0000-0003-2124-6184)
Publication_Date: 20210510
Title:

Geospatial_Data_Presentation_Form: vector and tabular digital data
Series_Information:

Series_Name:

Geologic Inputs for the 2023 Alaska Update to the U.S. National Seismic Hazard Model (NSHM)

Issue_Identification: ver 2.0, February 2023

Publication_Information:

Publication_Place: Anchorage, Alaska
Publisher: U.S. Geological Survey, Alaska Science Center

Other_Citation_Details:

Suggested Citation: Bender, A.M, Haeussler, P.J., Powers, P.M., 2021, Geologic inputs for the 2023 Alaska update to the U.S. National Seismic Hazard Model (NSHM) (ver 2.0, February 2023): U.S. Geological Survey data release, https://doi.org/10.5066/P97NRR0F

Online_Linkage: https://doi.org/10.5066/P97NRR0F
Larger_Work_Citation:

Citation_Information:

Originator: U.S. Geological Survey, Alaska Science Center
Publication_Date: 2007
Title: Alaska Earthquake Hazards
Geospatial_Data_Presentation_Form: website
Series_Information:

Series_Name: Alaska Science Portal
Issue_Identification: 33

Publication_Information:

Publication_Place: Anchorage, Alaska
Publisher: U.S. Geological Survey, Alaska Science Center

Other_Citation_Details:

This is a link to the broader USGS Alaska Science Center research project supported by these data. Users will find a description of the research project and links to associated reports, publications, and data products.

Online_Linkage: https://alaska.usgs.gov/portal/project.php?project_id=33

Description:

Abstract:

This data release is composed of three crustal (as opposed to subduction zone) geologic input datasets for the 2023 Alaska update to the U.S. National Seismic Hazard Model (NSHM): 1) fault section vector line data, 2) fault zone vector polygon data, and 3) accompanying earthquake geology attributes.

Purpose:

The purpose of this data release is to provide geospatial data of crustal fault and fold lines and zones with slip rates and structural geometries as foundational geologic inputs for modeling seismic hazard in the 2023 National Seismic Hazard Map update for Alaska.

Supplemental_Information:

This version reflects input by the community of USGS, State, and academic scientists as well as geotechnical engineers and stakeholders following a public workshop held May 27, 2021.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2023

Currentness_Reference: publication date

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -165.92
East_Bounding_Coordinate: -130.15
North_Bounding_Coordinate: 70.75
South_Bounding_Coordinate: 50.39

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:ASC371

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificInformation

Theme:

Theme_Keyword_Thesaurus: NASA GCMD Earth Science Keyword Thesaurus
Theme_Keyword: Earth Science
Theme_Keyword: Tectonic Landforms
Theme_Keyword: Faults
Theme_Keyword: Tectonic Processes

Theme:

Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: Structural geology
Theme_Keyword: Paleoseismology

Place:

Place_Keyword_Thesaurus: USGS Geographic Names Information System (GNIS)
Place_Keyword: Alaska
Place_Keyword: Alaska Range
Place_Keyword: Brooks Range
Place_Keyword: Yukon

Access_Constraints: None
Use_Constraints:

It is requested that the authors and the USGS Alaska Science Center be cited for any subsequent publications that reference this dataset.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey, Alaska Science Center

Contact_Address:

Address_Type: Mailing and Physical
Address: 4210 University Drive
City: Anchorage
State_or_Province: Alaska
Postal_Code: 99508
Country: USA

Contact_Voice_Telephone: 907-786-7000
Contact_Electronic_Mail_Address: ascweb@usgs.gov

Data_Set_Credit:

Adrian Bender conducted the mapping and data compilation to prepare these datasets. Peter Haeussler and Peter Powers supervised the dataset preparation. Evan Thoms, Camille Collett, and Dennis Walworth reviewed the data release.

Cross_Reference:

Citation_Information:

Originator: U.S. Geological Survey
Publication_Date: 2020
Title: U.S. Quaternary Faults Interactive Fault Map
Geospatial_Data_Presentation_Form: website
Publication_Information:

Publication_Place: online
Publisher: U.S. Geological Survey

Other_Citation_Details:

U.S. Geological Survey, 2020, U.S. Quaternary Faults Interactive Fault Map: https://doi.org/10.5066/F7S75FJM

Online_Linkage: https://www.usgs.gov/natural-hazards/earthquake-hazards/faults

Cross_Reference:

Citation_Information:

Originator: U.S. Geological Survey
Publication_Date: 2017
Title: Quaternary Fault and Fold Database of the United States
Geospatial_Data_Presentation_Form: Vector digital data
Publication_Information:

Publication_Place: online
Publisher: U.S. Geological Survey

Other_Citation_Details:

U.S. Geological Survey, 2017, Quaternary fault and fold database for the United States, last updated 2020

Online_Linkage:

https://www.sciencebase.gov/catalog/item/589097b1e4b072a7ac0cae23

Cross_Reference:

Citation_Information:

Originator: U.S. Geological Survey
Publication_Date: 2022
Title: National Seismic Hazard Model
Geospatial_Data_Presentation_Form: website
Publication_Information:

Publication_Place: online
Publisher: U.S. Geological Survey

Other_Citation_Details:

U.S. Geological Survey - Earthquake Hazards, 2022, National Seismic Hazard Model, last updated March 9, 2022

Online_Linkage:

https://www.usgs.gov/programs/earthquake-hazards/science/national-seismic-hazard-model

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Where applicable, attribute values in this dataset were cross-referenced for accuracy and consistency with attributes in the U.S. Geological Survey Quaternary Fault and Fold Database (QFFD).

Logical_Consistency_Report:

Attribute values are internally consistent between the three datasets contained in this release, and are consistent with values stored in the U.S. Geological Survey Quaternary Fault and Fold Database (QFFD).

Completeness_Report:

Within this data release, the dataset NSHM2023_Alaska_FaultSections contains a map of lines simplified from the U.S. Geological Survey Quaternary Fault and Fold Database (QFFD). Simplification was executed for modeling purposes (downstream in the NSHM workflow) and involves removal of faults or folds with length less than 5 kilometers, manual consolidation of faults expressed as many small short features with line ends within 5 kilometers into continuous lines, and manual reduction of line vertex spacing to between 1 and 10 km to preserve essential strike changes with as few vertices as possible. The 10 km upper vertex spacing limit approximates half the thickness of the seismogenic crust.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

The positional accuracy of the fault trace linework reflects the 1:500,000 scale of the map. Mapped lines generally occur within 50 m of the fault trace lines archived in QFFD, which approximate the real-world position of the faults.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Publication_Place: online
Publisher: U.S. Geological Survey

Other_Citation_Details:

U.S. Geological Survey and Alaska Department of Natural Resources, Quaternary fault and fold database, accessed March 3, 2021 at: https://www.usgs.gov/natural-hazards/earthquake-hazards/faults

Online_Linkage: https://www.usgs.gov/natural-hazards/earthquake-hazards/faults

Type_of_Source_Media: online database
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2021

Source_Currentness_Reference: access date

Source_Citation_Abbreviation: Quaternary Fault and Fold Database (QFFD)
Source_Contribution:

Detailed fault and fold linework used to derive the simplified fault and deformation zones contained in this data release.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Aki, K.
Originator: Richards, P.G.
Publication_Date: 1980
Title: Quantitative Seismology: Theory and Methods
Geospatial_Data_Presentation_Form: Book
Publication_Information:

Publication_Place: San Francisco
Publisher: W.H. Freeman

Other_Citation_Details:

Aki, K., Richards, P.G. 1980. Quantitative Seismology: Theory and Methods. W.H. Freeman, San Francisco

Type_of_Source_Media: publication
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1980

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: Aki and Richards 1980
Source_Contribution: Reference for fault attribute definitions

Process_Step:

Process_Description: Accessed and downloaded QFFD data
Source_Used_Citation_Abbreviation: Quaternary Fault and Fold Database (QFFD)
Process_Date: 20210301

Process_Step:

Process_Description:

Used ESRI ArcMap (version 10.8.1) software to simplify (1:500,000 scale) lines >5 kilometers where State=Alaska in QFFD. Reduced line vertex spacing to between 1 and 10 kilometers in order to preserve key strike changes while using as few vertices as possible with a maximum spacing equivalent to half the thickness of Earth's seismogenic crust. For faults and folds with published active deformation rates and structural geometry information, we attributed the fault section lines with these data. Otherwise we attributed the fault sections with categorical data contained in the QFFD.

Source_Used_Citation_Abbreviation: Quaternary Fault and Fold Database (QFFD)
Process_Date: 20230123

Process_Step:

Process_Description:

Used ESRI ArcMap (version 10.8.1) software to generate polygon zones around fault and fold lines with some combination of inadequate length (<5 km) or ambiguous rate/timing of activity that precluded inclusion in the Fault Sections model as a line.

Source_Used_Citation_Abbreviation: Quaternary Fault and Fold Database (QFFD)
Process_Date: 20210301

Process_Step:

Process_Description:

Used ESRI ArcMap (version 10.8.1) software to generate centroid points of lines in the Fault Sections model to generate a table with additional data about each fault included in the Fault Sections model. Added latitude and longitude coordinates for each point and exported the attribute table as comma separated values file.

Source_Used_Citation_Abbreviation: QFFD
Process_Date: 20230130

Spatial_Data_Organization_Information:

Indirect_Spatial_Reference:

U.S. state and Canadian province provide geographic name reference.

Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 105

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.000000001
Longitude_Resolution: 0.000000001
Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: D_WGS_1984
Ellipsoid_Name: GCS_WGS_1984
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257224

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: NSHM2023_Alaska_FaultSections
Entity_Type_Definition:

Vector geospatial data mapping Alaska fault sections, including fault section attributes. Lines are simplified from active fault and fold traces mapped and archived in the Quaternary Fault and Fold Database of the United States (QFFD) and original studies cited in the companion table “NSHM2023_Alaska_EQGeoDB.csv”. The purpose of this database is to provide geology-based fault and fold lines, rates, and geometries for modeling earthquake hazard in the 2023 NSHM update for Alaska. Provided in Shapefile (SHP), KML and GeoJSON formats.

Entity_Type_Definition_Source: Author defined

Attribute:

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

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 104

Attribute:

Attribute_Label: Shape
Attribute_Definition: Feature geometry
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Polyline
Enumerated_Domain_Value_Definition: Vector geospatial polyline
Enumerated_Domain_Value_Definition_Source: ESRI

Attribute:

Attribute_Label: name
Attribute_Definition:

Unique fault section name. Corresponds to the 'name' field in the "NSHM2023_Alaska_EQGeoDB.csv" file, included with this data package.

Attribute_Definition_Source: Quaternary Fault and Fold Database (QFFD)
Attribute_Domain_Values:

Unrepresentable_Domain: Unique fault section name.

Attribute:

Attribute_Label: state
Attribute_Definition: State or Province in which fault section occurs
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: AK
Enumerated_Domain_Value_Definition: The state of Alaska, United States of America
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: YT
Enumerated_Domain_Value_Definition: The province of Yukon, Canada
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: BC
Enumerated_Domain_Value_Definition: The province of British Columbia, Canada
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute:

Attribute_Label: dip
Attribute_Definition:

Fault dip in degrees from horizontal. If dip is based on published observations (i.e., not assumed based on slip sense), the reference is cited in the 'DipRef' field of the "NSHM2023_Alaska_EQGeoDB.csv" table, included with this data package.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 5
Range_Domain_Maximum: 90
Attribute_Units_of_Measure: Degrees

Attribute:

Attribute_Label: rake
Attribute_Definition:

Fault rake in degrees (between 180 and -180) representing the direction of fault slip according to the right-hand rule convention of Aki and Richards (1980).

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -90
Range_Domain_Maximum: 180
Attribute_Units_of_Measure: degrees

Attribute:

Attribute_Label: upperDepth
Attribute_Definition:

Upper depth of fault in kilometers. This is primarily a place keeper field for subsequent applications; most entries from geologic inputs are 0.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: Upper depth of fault in kilometers.

Attribute:

Attribute_Label: lowerDepth
Attribute_Definition:

Lower depth of fault in kilometers. This is primarily a place keeper field for subsequent applications; most entries from geologic inputs are 0.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: Lower depth of fault in kilometers.

Attribute:

Attribute_Label: rateType
Attribute_Definition:

Indicates whether entry in 'rate' field represents fault-parallel (SLIP_RATE) or vertical (VERTICAL_SLIP_RATE) rate of fault offset.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: SLIP_RATE
Enumerated_Domain_Value_Definition: Entry in 'rate' field represents fault-parallel slip
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: VERTICAL_SLIP_RATE
Enumerated_Domain_Value_Definition: Entry in 'rate' field represents vertical motion
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: NOMINAL
Enumerated_Domain_Value_Definition:

Entry reflects an assigned nominal rate matching the lower QFFD rate bin that the authors deemed suitable based on fault expression.

Enumerated_Domain_Value_Definition_Source: Author defined

Attribute:

Attribute_Label: FaultID
Attribute_Definition:

Unique identifying number for each fault section. Corresponds to the 'FaultID' field in the "NSHM2023_Alaska_EQGeoDB.csv" file, included with this data package.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: Unique identifying number for each fault section.

Attribute:

Attribute_Label: rate
Attribute_Definition:

Vertical or fault-parallel slip rate in mm/yr, corresponds to the 'Rate' field in the table: "NSHM2023_Alaska_EQGeoDB.csv" included with this data package. Based on 'RateData' and 'RateRef' in table.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.01
Range_Domain_Maximum: 54.4
Attribute_Units_of_Measure: millimeters per year

Detailed_Description:

Entity_Type:

Entity_Type_Label: NSHM2023_Alaska_FaultZones
Entity_Type_Definition:

Vector geospatial data mapping Alaska fault zones. These are Polygon zones covering regions of diffuse or low-rate deformation. Zones defined based on active fault and fold traces mapped and archived in the QFFD and original studies cited in the companion table “NSHM2023_Alaska_EQGeoDB.csv”. Provided in Shapefile (SHP), KML and GeoJSON formats.

Entity_Type_Definition_Source: Author defined

Attribute:

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

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 3

Attribute:

Attribute_Label: Shape
Attribute_Definition: Feature geometry
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Polygon
Enumerated_Domain_Value_Definition: Vector geospatial polygon
Enumerated_Domain_Value_Definition_Source: ESRI

Attribute:

Attribute_Label: Id
Attribute_Definition: Sequential record identifier
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: Sequential record identifier

Attribute:

Attribute_Label: name
Attribute_Definition: Unique fault zone polygon name.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: Fault zone name

Attribute:

Attribute_Label: state
Attribute_Definition: State or Province in which fault zone occurs
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: AK
Enumerated_Domain_Value_Definition: The state of Alaska, United States of America
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: YT
Enumerated_Domain_Value_Definition: The province of Yukon, Canada
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: BC
Enumerated_Domain_Value_Definition: The province of British Columbia, Canada
Enumerated_Domain_Value_Definition_Source: Author defined

Detailed_Description:

Entity_Type:

Entity_Type_Label: NSHM2023_Alaska_EQGeoDB.csv
Entity_Type_Definition:

Table that documents the sources for geologic rate and geometry inputs to the fault sections in the "NSHM2023_Alaska_FaultSections" file included with this data package. Files can joined using the 'FaultID' or 'Name' field. These data can also be displayed independently as points with coordinates of the fault section line midpoint (CentLat, CentLong). Presented in a Comma Separated Value (CSV) formatted table.

Entity_Type_Definition_Source: Author defined

Attribute:

Attribute_Label: FaultID
Attribute_Definition:

Unique identifying number for each fault section. Corresponds to the 'FaultID' field in the "NSHM2023_Alaska_FaultSections" file, included with this data package.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain: Unique identifying number for each fault section.

Attribute:

Attribute_Label: Name
Attribute_Definition:

Unique fault section name. Corresponds to the 'name' field in the "NSHM2023_Alaska_FaultSections" file, included with this data package.

Attribute_Definition_Source: Quaternary Fault and Fold Database (QFFD)
Attribute_Domain_Values:

Unrepresentable_Domain: Unique fault section name.

Attribute:

Attribute_Label: state
Attribute_Definition: State or Province in which fault section occurs
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: AK
Enumerated_Domain_Value_Definition: The state of Alaska, United States of America
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: YT
Enumerated_Domain_Value_Definition: The province of Yukon, Canada
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: BC
Enumerated_Domain_Value_Definition: The province of British Columbia, Canada
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute:

Attribute_Label: CentLat
Attribute_Definition:

Latitude of the midpoint of each fault section line. Derived from the "NSHM2023_Alaska_FaultSections" file, included with this data package.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 53.2316
Range_Domain_Maximum: 70.5277
Attribute_Units_of_Measure: Decimal degrees (WGS 1984)

Attribute:

Attribute_Label: CentLong
Attribute_Definition:

Longitude of the midpoint of each fault section line. Derived from the "NSHM2023_Alaska_FaultSections" file, included with this data package.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -165.413
Range_Domain_Maximum: -132.8902
Attribute_Units_of_Measure: Decimal degrees (WGS 1984)

Attribute:

Attribute_Label: RateData
Attribute_Definition:

This field describes slip rate source data. If the slip rate is derived from a field study, the entry is "slip rate study". If a categorical rate is applied, the entry is "QFFD slip rate bin lower bound". If rate represents balance between rates of kinematically adjacent structures, the entry is "rate balanced".

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: slip rate study
Enumerated_Domain_Value_Definition:

Slip rate is derived from field data. Citation to the referenced study provided in the 'RateRef' field of this table.

Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: QFFD slip rate bin lower bound
Enumerated_Domain_Value_Definition: Slip rate entry is a categorical lower QFFD bin rate bound.
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: rate balanced
Enumerated_Domain_Value_Definition:

Rate entry represents balance between rates of kinematically adjacent structures.

Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: nominal assigned value
Enumerated_Domain_Value_Definition:

Rate entry is assigned lower QFFD value consistent with fault expression in the absence of extant rate constraint.

Enumerated_Domain_Value_Definition_Source: Author defined

Attribute:

Attribute_Label: Rate
Attribute_Definition: Slip rate in mm/yr selected based on RateData and RateRef.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.01
Range_Domain_Maximum: 54.4
Attribute_Units_of_Measure: millimeters per year

Attribute:

Attribute_Label: RateRef
Attribute_Definition: Reference for the source used to derive the 'rate' entry.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 'RateData' = "slip rate study"
Enumerated_Domain_Value_Definition: Citation of the referenced study.
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 'RateData' = "QFFD"
Enumerated_Domain_Value_Definition: Slip rate bin lower bound, assigned to the fault in the QFFD.
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 'RateData' = "rate balanced"
Enumerated_Domain_Value_Definition:

Explanation of the fault rates balanced to yield the assigned rate.

Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 'RateData' = "nominal assigned value"
Enumerated_Domain_Value_Definition:

The fault section rate is not explicitly known but assigned to match the lower QFFD rate bin that the authors deemed suitable based on fault expression.

Enumerated_Domain_Value_Definition_Source: Author defined

Attribute:

Attribute_Label: DipDeg
Attribute_Definition:

Fault dip in degrees from horizontal. If dip is based on published observations (i.e., not assumed based on slip sense), the reference is cited in the 'DipRef' field of this table.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 5
Range_Domain_Maximum: 90
Attribute_Units_of_Measure: Degrees

Attribute:

Attribute_Label: DipDir
Attribute_Definition: Direction of fault dip.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: N
Enumerated_Domain_Value_Definition: north
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: NE
Enumerated_Domain_Value_Definition: northeast
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: E
Enumerated_Domain_Value_Definition: east
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: SE
Enumerated_Domain_Value_Definition: southeast
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: S
Enumerated_Domain_Value_Definition: south
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: SW
Enumerated_Domain_Value_Definition: southwest
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: W
Enumerated_Domain_Value_Definition: west
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: NW
Enumerated_Domain_Value_Definition: northwest
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: V
Enumerated_Domain_Value_Definition: vertical
Enumerated_Domain_Value_Definition_Source: Author defined

Attribute:

Attribute_Label: DipRef
Attribute_Definition:

Source study citation for fault dip, or basis for dip assumption (e.g., "assumed based on slip sense (reverse)").

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

Source study citation for fault dip, or basis for dip assumption (e.g., "assumed based on slip sense (reverse)").

Attribute:

Attribute_Label: LowDepth
Attribute_Definition:

Lower structural depth of fault in kilometers. The default value is 0 for unknown lower fault depths. References cited for reported lower depth values are listed in the 'DepthRef' field of this table.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 10
Range_Domain_Maximum: 35

Attribute:

Attribute_Label: DepthRef
Attribute_Definition:

Reference cited for 'LowDepth' field'. Default LowDepth value of 0 km corresponds to faults of unknown lower depth.

Attribute_Definition_Source: Author defined
Attribute_Domain_Values:

Unrepresentable_Domain:

Reference cited or nominal default assignment for "LowDepth" field entry.

Geologic Inputs for the 2023 Alaska Update to the U.S. National Seismic Hazard Model (NSHM)

Metadata: