Seismic Hazard Maps for Seattle, Washington, Incorporating 3D Sedimentary Basin Effects, Nonlinear Site Response, and Rupture Directivity
Entry ID: USGS_OFR_2007_1175

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Summary
Abstract: This report presents probabilistic seismic hazard maps for
Seattle, Washington, based on over 500 3D simulations of ground
motions from scenario earthquakes. These maps include 3D sedimentary
basin effects and rupture directivity. Nonlinear site response for
soft-soil sites of fill and alluvium was also applied in the maps. The
report describes the methodology for incorporating source and site
dependent amplification factors into a probabilistic seismic hazard
calculation. 3D simulations were conducted for the various earthquake
sources that can affect Seattle: Seattle fault zone, Cascadia
subduction zone, South Whidbey Island fault, and background shallow
and deep earthquakes. The maps presented in this document used
essentially the same set of faults and distributed-earthquake sources
as in the 2002 national seismic hazard maps. The 3D velocity model
utilized in the simulations was validated by modeling the amplitudes
and waveforms of observed seismograms from five earthquakes in the
region, including the 2001 M6.8 Nisqually earthquake. The
probabilistic seismic hazard maps presented here depict 1 Hz response
spectral accelerations with 10%, 5%, and 2% probabilities of
exceedance in 50 years. The maps are based on determinations of
seismic hazard for 7236 sites with a spacing of 280 m.

The maps show that the most hazardous locations for this
frequency band (around 1 Hz) are soft-soil sites (fill and alluvium)
within the Seattle basin and along the inferred trace of the frontal
fault of the Seattle fault zone. The next highest hazard is typically
found for soft-soil sites in the Duwamish Valley south of the Seattle
basin. In general, stiff-soil sites in the Seattle basin exhibit
higher hazard than stiff-soil sites outside the basin. Sites with
shallow bedrock outside the Seattle basin have the lowest estimated
hazard for this frequency band.
[Summary provided by the USGS.]

Related URL
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Description: Seismic hazard map of Seattle, Washington, 1 Hz Spectral Acceleration with 2% Probability of Exceedance in 50 Years.


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Description: Seismic hazard map of Seattle, Washington, 1 Hz Spectral Acceleration with 5% Probability of Exceedance in 50 Years.


Link: GET DATA
Description: Seismic hazard map of Seattle, Washington, 1 Hz Spectral Acceleration with 10% Probability of Exceedance in 50 Years.


Link: GET DATA
Description: Contains related digital data, archived as a ZIP file for the Seismic Hazard Maps for Seattle, Washington, Incorporating 3D Sedimentary Basin Effects, Nonlinear Site Response, and Rupture Directivity.


Geographic Coverage
 N: 48.0 S: 47.0  E: -122.0  W: -123.0

Data Set Citation
Dataset Originator/Creator: Arthur D. Frankel, William J. Stephenson, David L. Carver, Robert A. Williams, Jack K. Odum, and Susan Rhea
Dataset Title: Seismic Hazard Maps for Seattle, Washington, Incorporating 3D Sedimentary Basin Effects, Nonlinear Site Response, and Rupture Directivity
Dataset Series Name: Open File Report
Dataset Release Date: 2007
Dataset Publisher: U.S. Geological Survey
Issue Identification: 2007-1175
Online Resource: http://pubs.usgs.gov/of/2007/1175/


Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > WASHINGTON


Science Keywords
HUMAN DIMENSIONS >NATURAL HAZARDS >EARTHQUAKES >EARTHQUAKES    [Definition]
SOLID EARTH >TECTONICS >EARTHQUAKES >EARTHQUAKE MAGNITUDE/INTENSITY    [Definition]
SOLID EARTH >TECTONICS >EARTHQUAKES >EARTHQUAKE OCCURRENCES    [Definition]
SOLID EARTH >TECTONICS >EARTHQUAKES >EARTHQUAKE PREDICTIONS    [Definition]
SOLID EARTH >TECTONICS >EARTHQUAKES >SEISMIC PROFILE >SEISMIC BODY WAVES    [Definition]
SOLID EARTH >TECTONICS >EARTHQUAKES >SEISMIC PROFILE    [Definition]
SOLID EARTH >TECTONICS >EARTHQUAKES >SEISMIC PROFILE >SEISMIC SURFACE WAVES    [Definition]


ISO Topic Category
GEOSCIENTIFIC INFORMATION


Instrument
SEISMOGRAPHS    [Information]
SEISMOMETERS    [Information]


Keywords
OFR
Open File Report
Earthquakes
Seismic Hazards
Seismic Profiles
Ground Motion


Data Set Progress
PLANNED


Originating Center
USGS


Data Center
Publications-Western Region,Geological Division, U.S. Geological Survey, U.S. Department of the Interior    [Information]
Data Center URL: http://geopubs.wr.usgs.gov/

Data Center Personnel
Name: USGS WESTERN PUBLICATIONS GROUP
Phone: 650-329-5057
Contact Address:
U.S. Geological Survey
345 Middlefield Rd, MS 951
City: Menlo Park
Province or State: CA
Postal Code: 94025
Country: USA



Distribution
Distribution_Media: Online
Fees: No fees


Personnel
USGS WESTERN PUBLICATIONS GROUP
Role: TECHNICAL CONTACT
Phone: 650-329-5057
Contact Address:
U.S. Geological Survey
345 Middlefield Rd, MS 951
City: Menlo Park
Province or State: CA
Postal Code: 94025
Country: USA



Creation and Review Dates
DIF Creation Date: 2007-09-11
Last DIF Revision Date: 2007-10-04

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