sea5percentg_pt

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Susan Rhea
Publication_Date: 2007
Title:
sea5percentg_pt
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.usgs.gov/of/2007/1175/
Description:
Abstract:
Seismic Hazard Maps for Seattle, Washington  Incorporating 3D Sedimentary Basin Effects, Nonlinear Site Response, and Rupture Directivity - 5 % 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: -122.449997
East_Bounding_Coordinate: -122.203552
North_Bounding_Coordinate: 47.749424
South_Bounding_Coordinate: 47.480000
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: Open File Report
Issue_Identification: 2007-1175
Online_Linkage: http://pubs.usgs.gov/of/2007/1175/
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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_pt.shp.xml
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Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Entity point
Point_and_Vector_Object_Count: 7236
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 2749
Column_Count: 1548
Vertical_Count: 1
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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
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Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: sea5percentg_pt
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: lat
Attribute:
Attribute_Label: LON
Attribute:
Attribute_Label: LAT
Attribute:
Attribute_Label: Shape
Attribute_Definition:
Feature geometry.
Attribute_Definition_Source:
ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Coordinates defining the features.
Attribute:
Attribute_Label: lon
Attribute:
Attribute_Label: ACCEL
Overview_Description:
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: USGS publications
Hours_of_Service: 24 hours
Contact Instructions:
http://pubs.usgs.gov/of/2007/1175/
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: 0.193
Digital_Transfer_Option:
Online_Option:
Access_Instructions:
download from Open File Reports, USGS pubs
Online_Computer_and_Operating_System:
http://pubs.usgs.gov/of/2007/1175/
Fees: none
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Metadata_Reference_Information:
Metadata_Date: 20070723
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
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