Seismic-Hazard Maps for Alaska and the Aleutian Islands: PGA250

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Wesson, Robert L.
Originator: Frankel, Arthur D.
Originator: Mueller, Charles S.
Originator: Harmsen, Stephen C.
Originator: Rukstales, Kenneth S. (compiler)
Publication_Date: 1999
Title: Seismic-Hazard Maps for Alaska and the Aleutian Islands: PGA250
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: U.S. Geological Survey Geologic Investigations Series
Issue_Identification: I-2679
Publication_Information:
Publication_Place: Denver, Colorado
Publisher: U.S. Geological Survey
Online_Linkage: http://pubs.usgs.gov/imap/i-2679/index.html
Description:
Abstract:
Probabilistic seismic hazard maps were prepared for Alaska portraying peak horizontal ground acceleration and horizontal spectral response acceleration for 0.2, 0.3, and 1.0 second periods with probabilities of exceedance of 10% in 50 years and 2% in 50 years. This particular data set is for peak horizontal acceleration with a 2% probability of exceedance in 50 years. All of the maps were prepared by combining hazard derived from spatially-smoothed historic seismicity with hazard from fault-specific sources. The acceleration values contoured are the random horizontal component. The reference site condition is firm rock, defined as having an average shear-wave velocity of 760 m/sec in the top 30 meters corresponding to the boundary between NEHRP site classes B and C.
This data set represents the results of calculations of hazard curves for a grid of points with a spacing of 0.1 degrees in latitude and longitude. The grid of points were contoured to produce the final representation of the seismic-hazard.
Purpose:
This map is intended to summarize the available quantitative information about seismic ground motion hazard in Alaska from geologic and geophysical sources.
Supplemental_Information:
A description of how the underlying geologic and geophysical data were prepared as well as the methodology used in calculating hazard for a geographic location can be found in the following report:
Wesson, Robert, Frankel, Arthur, Mueller, Charles, and Harmsen, Stephen, 1999, Probabilistic Seismic Hazard Maps of Alaska: U.S. Geological Survey Open-File Report 99-36, 48 p.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1999
Currentness_Reference: publication date

Status:
Progress: Complete
Maintenance_and_Update_Frequency: As Needed

Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: 170.0
East_Bounding_Coordinate: -130.0
North_Bounding_Coordinate: 72.0
South_Bounding_Coordinate: 50.0

Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: seismic
Theme_Keyword: earthquake
Theme_Keyword: hazard
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: Alaska
Place_Keyword: Aleutian Islands

Theme:
Theme_Keyword_Thesaurus: National Geologic Map Database Catalog themes, augmented
Theme_Keyword: 1500 - Hazards
Theme_Keyword: 1501 - Earthquakes
Place:
Place_Keyword_Thesaurus: Augmented FIPS 10-4 and FIPS 6-4
Place_Keyword: f02013 = Aleutians East
Place_Keyword: f02016 = Aleutians West
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: seismology
Theme_Keyword: earthquake probabilities
Theme_Keyword: maps and atlases
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Categories
Theme_Keyword: geoscientificInformation
Access_Constraints: none
Use_Constraints:
The data are not to be used for areas outside of Alaska and the Aleutian Islands.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Ken Rukstales
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing address
Address: Box 25046, Mail Stop 966
City: Denver
State_or_Province: Colorado
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: 303-273-8677
Contact_Facsimile_Telephone: 303-273-8600
Contact_Electronic_Mail_Address: rukstales@usgs.gov
Contact_Instructions: Best to contact via e-mail or telephone

Data_Set_Credit:
We thank Max Wyss and Stefan Wiemer of the Geophysical Institute, University of Alaska, and John Lahr of the U.S. Geological Survey for their help with seismicity catalogs. Ken Rukstales prepared the ARC/INFO data and formatted the GIS versions of the maps.
Native_Data_Set_Environment:
Solaris 2.6 on a UNIX workstation ARC/INFO version 7.1.2
Cross_Reference:
Citation_Information:
Originator: Wesson, Robert L.
Originator: Frankel, Arthur D.
Originator: Mueller, Charles S.
Originator: Harmsen, Stephen C.
Publication_Date: 1999
Title: Probabilistic Seismic Hazard Maps of Alaska
Geospatial_Data_Presentation_Form: document
Series_Information:
Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: 99-36
Publication_Information:
Publication_Place: Denver, Colorado
Publisher: U.S. Geological Survey

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Calculation of the acceleration values is described in the following report:
Wesson, Robert, Frankel, Arthur, Mueller, Charles, and Harmsen, Stephen, 1999, Probabilistic Seismic Hazard Maps of Alaska: U.S. Geological Survey Open-File Report 99-36, 48 p.
The hazard maps do not consider uncertainty in the underlying seismicity or fault parameters.
Logical_Consistency_Report: Polygon and chain-node topology present.
Completeness_Report:
Areas outside of Alaska and the Aleutian Islands have been removed.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The location of features is based on theoretical calculations of a seismological model for the study area. The location of each point is considered to be correct within the confines of computer accuracy.
Lineage:
Process_Step:
Process_Description:
The data to produce the maps were originally an ASCII file of grid points having a latitude and longitude spacing of 0.1 degrees. Each grid point had an associated acceleration value calculated from the prescribed seismological model. The data were imported into a grid and then contoured using ARC/INFO. The desired final contours were selected and polygon and arc topology were ascertained as well as appropriate feature attributes.
Process_Date: 1999
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Ken Rukstales
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing address
Address: Box 25046, Mail Stop 966
City: Denver
State_or_Province: Colorado
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: 303-273-8677
Contact_Facsimile_Telephone: 303-273-8600
Contact_Electronic_Mail_Address: rukstales@usgs.gov
Contact_Instructions: Best to contact via e-mail or telephone

Process_Step:
Process_Description: Creation of original metadata record
Process_Date: 19990610
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Ken Rukstales
Contact_Address:
Address_Type: mailing address
Address: Box 25046, Mail Stop 966
City: Denver
State_or_Province: Colorado
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: 303-273-8677
Contact_Facsimile_Telephone: 303-273-8600
Contact_Electronic_Mail_Address: rukstales@usgs.gov
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 113

SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 225

SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 114

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Albers Conical Equal Area
Albers_Conical_Equal_Area:
Standard_Parallel: 55
Standard_Parallel: 65
Longitude_of_Central_Meridian: -160
Latitude_of_Projection_Origin: 0
False_Easting: 0.00000
False_Northing: 0.00000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.0001
Ordinate_Resolution: 0.0001
Planar_Distance_Units: Meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 294.98

Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview: 
Attribute items are in ARC/INFO feature class format.  Additional
items that were added to the data are:

POLYGON

attribute        description
=========	===========
acc_val	      Acceleration value in percent of gravity of the
                 polygon.  The polygon represents the range of
                 acceleration values that are contained within its
                 borders.  The polygon is assigned the lowest value
                 allowed within the polygon's borders.  The range of
                 values allowed within a polygon is controlled by the
                 contours.  Valid values are:  0,2,4,6,8,10,12,14,16,
                 18,20,30,40,50,60,80,120,160,200

valley		A topological indicator that tells whether the area
                 contained within the polygon is a local minima (valley)
                 or not.  A value of "1" indicates the area is a local
                 minima.
LINE

attribute 	description
=========	===========
acc_val	      Acceleration value in percent of gravity that the
                 contour represents.  Valid values are:  0,2,4,6,8,10,12,
                 14,16,18,20,30,40,50,60,80,120,160,200

valley		A topological indicator that tells whether the area
                 contained within the contour is a local minima (valley)
                 or not.  A value of "1" indicates the area is a local
                 minima.
Entity_and_Attribute_Detail_Citation: none

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey, Information Services
Contact_Address:
Address_Type: mailing address
Address: Box 25286, Mail Stop 306
City: Denver
State_or_Province: Colorado
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: 1-888-ASK-USGS
Contact_Facsimile_Telephone: 303-202-4693

Resource_Description:
U.S. Geological Survey Geologic Investigations Series I-2679 (Sheet 2 of 2)
Seismic-Hazard Maps For Alaska and the Aleutian Islands, Sheet2, 2% Probability of Exceedance in 50 Years For Peak Horizontal Acceleration and Horizontal Spectral Response Acceleration For 0.2, 0.3, and 1.0 Second Periods (5% of Critical Damping)
Distribution_Liability:
Although these data have been used by the U.S. Geological Survey, no warranty, expressed or implied is made by the USGS as to the accuracy of the data and related material nor shall the fact of distribution constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: PDF
Format_Version_Number: version 4.0
Format_Specification: Adobe Portable Document Format
Format_Information_Content:
U.S. Geological Survey Geologic Investigations Series I-2679 (Sheet 2 of 2)
Seismic-Hazard Maps For Alaska and the Aleutian Islands, Sheet2, 2% Probability of Exceedance in 50 Years For Peak Horizontal Acceleration and Horizontal Spectral Response Acceleration For 0.2, 0.3, and 1.0 Second Periods (5% of Critical Damping)
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: http://pubs.usgs.gov/imap/i-2679/i2679-2.pdf
Fees: none
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Ken Rukstales
Contact_Address:
Address_Type: mailing address
Address: Box 25046, Mail Stop 966
City: Denver
State_or_Province: Colorado
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: 303-273-8677
Contact_Electronic_Mail_Address: rukstales@usgs.gov
Contact_Instructions: Best to contact via e-mail or telephone

Resource_Description:
Downloadable geospatial data sets in ARC/INFO export format are available.
Distribution_Liability:
Although these data have been used by the U.S. Geological Survey, no warranty, expressed or implied is made by the USGS as to the accuracy of the data and related material nor shall the fact of distribution constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARCE
Format_Version_Number: 7.2.1
Format_Information_Content:
Seismic-Hazard Map For Alaska and the Aleutian Islands, 2% Probability of Exceedance in 50 Years For Peak Horizontal Acceleration
File_Decompression_Technique:
Files need to be decompressed using gzip, winzip, or similar utility
Transfer_Size: 0.1484
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: http://pubs.usgs.gov/imap/i-2679/akpga250.e00.gz
Fees: none
Metadata_Reference_Information:
Metadata_Date: 20160613
Metadata_Review_Date: 1999
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Peter N Schweitzer
Contact_Organization: USGS Midwest Area
Contact_Position:
Collection manager, USGS Geoscience Data Clearinghouse, http://geo-nsdi.er.usgs.gov/
Contact_Address:
Address_Type: mailing address
Address:
Mail Stop 954
12201 Sunrise Valley Dr
City: Reston
State_or_Province: VA
Postal_Code: 20192-0002
Country: USA
Contact_Voice_Telephone: 703-648-6533
Contact_Facsimile_Telephone: 703-648-6252
Contact_Electronic_Mail_Address: pschweitzer@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Access_Constraints: none
Metadata_Use_Constraints: none
This page is <https://geo-nsdi.er.usgs.gov/metadata/map-i/2679/PGA250.html>
Generated by mp version 2.9.48 on Tue Jul 03 20:04:53 2018