sea10percentg

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: Susan Rhea

Publication_Date: 2007

Title: sea10percentg

Geospatial_Data_Presentation_Form: vector digital data

Series_Information:

Series_Name: Open File Report

Issue_Identification: 2007-1175

Publication_Information:

Publication_Place: Denver CO

Publisher: USGS

Online_Linkage:

<http://pubs.er.usgs.gov/usgspubs/ofr/ofr20071175/sea10percentg.shp>

Description:

Abstract:

Seismic Hazard Maps for Seattle, Washington Incorporating 3D Sedimentary Basin Effects, Nonlinear Site Response, and Rupture Directivity - 10 % probability of exceedance in 50 years. It is clear from recent seismological research that sedimentary basins strongly affect the amplitude and duration of earthquake ground motions and are responsible for certain damage patterns caused by earthquakes (e.g., Graves et al. 1998; Stephenson et al., 2006). Furthermore, it has been recognized for many decades that shallow geological units such as artificial fill amplify ground shaking and that the direction of rupture propagation on a fault (directivity; e.g. Wald et al., 1996) is an important cause of large-velocity ground-motion pulses that can damage buildings. As seismologists develop a predictive understanding of these phenomena, they can be quantitatively incorporated into probabilistic assessments of seismic hazard. In this paper we include these effects in seismic hazard maps for Seattle, which we call urban seismic hazard maps. Urban seismic hazard maps provide more spatially-detailed information about seismic hazard than the national seismic hazard maps, which use a firm-rock site condition and ground-motion relations that don't explicitly include rupture directivity. However, these urban seismic hazard maps are not site-specific maps. They are based on models of sub-surface structure that are often interpolated from sub-surface data several hundreds of meters from a given site, as opposed to a site-specific study where a shear-wave velocity profile is measured at that particular location. The Seattle maps presented in this document use the same set of faults and distributed-earthquake sources as in the 2002 national seismic hazard maps (Frankel et al., 2002a). The new maps include the effects of the Seattle Basin, the young alluvium and artificial fill, and rupture directivity on the Seattle fault. A summary of the methodology and preliminary maps were presented in Frankel et al. (2006).

Purpose:

Provide urban seismic hazard maps that include effects of local geology on site response to damaging earthquakes.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2007

Currentness_Reference: publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -122.435954

East_Bounding_Coordinate: -122.232218

North_Bounding_Coordinate: 47.739756

South_Bounding_Coordinate: 47.493548

Keywords:

Theme:

Theme_Keyword: urban seismic hazard, acceleration, site response

Place:

Place_Keyword: Seattle, Washington, USA

Access_Constraints: none.

Use_Constraints:

User is cautioned that original data points used to interpolate raster, and then polygon, had 280 meter spacing. Boundaries should be considered accurate to plus/minus 280 meters (aka 900 feet).

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Susan Rhea

Contact_Organization: USGS

Contact_Position: GIS Specialist

Contact_Electronic_Mail_Address: rhea@usgs.gov

Hours_of_Service: weekdays

Native_Data_Set_Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.2.1350

Cross_Reference:

Citation_Information:

Originator:

Arthur D. Frankel, William J. Stephenson, David L. Carver, Robert A. Williams, Jack K. Odum, and Susan Rhea

Publication_Date: 2007

Title:

Seismic Hazard Maps for Seattle, Washington Incorporating 3D Sedimentary Basin Effects, Nonlinear Site Response, and Rupture Directivity

Edition: Open File Report

Geospatial_Data_Presentation_Form: map

Series_Information:

Series_Name: USGS Open File Report

Issue_Identification: 2007-1175

Online_Linkage: <http://pubs.usgs.gov/>

Data_Quality_Information:

Attribute_Accuracy:

Quantitative_Attribute_Accuracy_Assessment:

Attribute_Accuracy_Value: acceleration

Attribute_Accuracy_Explanation:

%g acceleration with a 10% probability of exceedance in 50 years

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report: 280 meters

Lineage:

Process_Step:

Process_Description:

ASCII point data imported into ArcGis shapefile and 'surface' interpolated with ArcGIS Surface Interpolation Natural Neighbors algorithm. Area outside of Seattle Basin calculated, then area inside basin calculated, and two resulting surfaces merged. Erased values in areas covered by water.

Exported raster with Gridpoly command, weedtol 18, to get smoother boundaries.

Source_Used_Citation_Abbreviation: E:\pacnw\SeattleHazMap\mar2007\nn10comb\metadata.xml

Process_Date: Oct 2006 to Apr 2007

Process_Step:

Process_Description: Metadata imported.

Source_Used_Citation_Abbreviation: E:\pacnw\SeattleHazMap\mar2007\nn10comb\metadata.xml

Process_Step:

Process_Description: Metadata imported.

Source_Used_Citation_Abbreviation: E:\pacnw\SeattleHazMap\finals\sea10percentg.shp.xml

Process_Step:

Process_Description: Metadata imported.

Source_Used_Citation_Abbreviation: E:\pacnw\SeattleHazMap\finals\sea10percentg.shp.xml

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: G-polygon

Point_and_Vector_Object_Count: 147

Raster_Object_Information:

Raster_Object_Type: Grid Cell

Row_Count: 2749

Column_Count: 1548

Vertical_Count: 1

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.000000

Longitude_Resolution: 0.000000

Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257222

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: sea10percentg

Entity_Type_Definition: acceleration

Entity_Type_Definition_Source: Arthur Frankel

Attribute:

Attribute_Label: FID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: PERCENT_G

Overview_Description:

Distribution_Information:

Resource_Description: Downloadable Data

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: ArcGIS Shapefile

Format_Version_Number: ArcGIS 9.2

File_Decompression_Technique: unzip

Transfer_Size: 0.079

Digital_Transfer_Option:

Online_Option:

Access_Instructions: download from Open File Reports, USGS pubs

Online_Computer_and_Operating_System: <http://pubs.usgs.gov/>

Fees: none

Metadata_Reference_Information:

Metadata_Date: 20070622

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Susan Rhea

Contact_Organization: USGS

Contact_Position: GIS Specialist

Contact_Address:

Address_Type: mailing address

Address: MS 966 Box 25046 Federal Center

City: Denver

State_or_Province: CO

Postal_Code: 80225

Country: USA

Contact_Voice_Telephone: 303.273.8639

Contact_Electronic_Mail_Address: rhea@usgs.gov

Hours_of_Service: weekdays

Contact_Instructions: email is best

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Access_Constraints: none

Metadata_Use_Constraints: none

Metadata_Extensions:

Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>

Profile_Name: ESRI Metadata Profile