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: 1HZ050 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 horizontal spectral response acceleration for 1.0 second period with a 10% 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_Keyword: geospatial datasets 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: 65 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: String Point_and_Vector_Object_Count: 160 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains Point_and_Vector_Object_Count: 66 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: 0,1,2,3,4,5,6,7,8,9,10, > 15,20,25,30,40,60,80,100 > >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: 0,1,2,3,4,5,6,7, > 8,9,10,15,20,25,30,40,60,80,100 > >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 1 of 2) Seismic-Hazard Maps For Alaska and the Aleutian Islands, Sheet1, 10% 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 1 of 2) Seismic-Hazard Maps For Alaska and the Aleutian Islands, Sheet1, 10% 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/i2679-1.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, 10% Probability of Exceedance in 50 Years For Horizontal Spectral Response Acceleration For 1.0 Second Period (5% of Critical Damping) File_Decompression_Technique: Files need to be decompressed using gzip, winzip, or similar utility Transfer_Size: 0.0977 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/imap/i-2679/ak1hz050.e00.gz Fees: none Metadata_Reference_Information: Metadata_Date: 20160613 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