Seattle’s earthquake vulnerability
How vulnerable is Seattle?
We learned previously that cities along the Northwest coast of the U.S. face a significant
hazard in the form of megathrust (subduction) earthquakes and tsunami. In the case of
Seattle, Washington, their earthquake vulnerability does not stop there. In addition,
there are a series of active faults within the crust in the vicinity of Seattle have the
potential to host earthquakes greater the M 7. Here we will assess the specific
vulnerabilities that Seattle has in the face of such earthquakes. Your goal in this study is
to identify these vulnerabilities and incorporate them into a development of a set of
recommendations and priorities for mitigating the risks. To do this you have the been
provided the following materials and figures:
1. Series of maps outlining infrastructure, local geologic characteristics, population, and
related information. [Most of the maps were obtained from the 2007 Seattle Disaster
Readiness and Response Plan: www.seattle.gov/emergency/programs/ ]. Maps
include Population Density, Topography, Liquefaction/Landslide Zones, Police
Precincts, Hospital/Schools/Special Needs, Transportation, Regional Water
Systems, Waste Disposal System, Fire Stations/Districts.
2. The Earthquake Incident Annex (July 11,2011) to that Response Plan (same web
site).
3. Map of expected Strong Ground Shaking (Peak Ground Acceleration) for a scenario
Mw 6.7 earthquake on the Seattle fault. This is the scenario event you will use for
your analysis. Based on the results from the Christchurch earthquake, locations with
peak ground accelerations > 0.25 g are susceptible to serious damage.
Using these materials and what you have learned from the Haiti and Christchurch
events, analyze the range of vulnerabilities to earthquake damage that Seattle faces.
Use the maps to identify the most vulnerable locations (the weak links) that could
hamper rescue and response efforts. Assess where you might expect the largest
numbers of casualties (deaths and injuries), what services will be available, and where
response teams should be deployed.
Your report will be in the form of a report to the State of Washington, Emergency
Management Office outlining and prioritizing the issues that will arise and hinder
emergency response after an earthquake such as this scenario event. The report will
include a brief cover memo (transmittal memo), a 1-page Executive Summary with 2
main sections (1) Vulnerabilities and (2) Recommendations, and the main report that
should be approximately 5 pages (single spaced) including a 1-page figure (map?) that
is used in identifying issues and recommendations. The report is aimed at the statelevel
as it would be expected that after such an event, the local emergency
management communities will be overwhelmed and needing state assistance.
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