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Open-File Report O-17-01, Oregon Hospital and Water System Earthquake Risk Evaluation Pilot Study
by Yumei Wang, 144 p.

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From the Executive Summary:

A pilot project to evaluate the risk of hospitals and water systems from earthquakes triggered by the Cascadia subduction zone was conducted by the Oregon Department of Geology and Mineral Industries (DOGAMI) in partnership with the Oregon Health Authority (OHA), which has oversight responsibilities on hospitals and drinking water safety for the state. This project was initiated shortly after the release of the 2013 Oregon Resilience Plan by the Oregon Seismic Safety Policy Advisory Commission (2013).

The first goal was to establish a working partnership between OHA and DOGAMI to better understand and improve seismic preparedness of hospitals including their resilience to magnitude 9 Cascadia subduction zone earthquakes and tsunamis. The second goal was to improve awareness of seismic risks to hospital and water system operators in the project study region and to encourage action to increase community resilience, particularly by hospitals. Through site visits, project efforts have successfully provided information helpful to hospitals and water system operators to take steps to better prepare for, respond to, and recover from future earthquakes.

In accordance with needs identified in the 2013 Oregon Resilience Plan, DOGAMI 1) conducted vulnerability assessments of hospitals, 2) improved on the Hazus default database inventory of water systems, 3) conducted vulnerability assessments of water systems, and 4) considered interdependencies between hospitals, water systems, and transportation.

The main tasks involved 1) gathering data on hospitals and water systems, 2) inputting the data into Federal Emergency Management Agency (FEMA) Hazus MH (short for Hazards United States Multi-Hazards) loss estimation software, 3) applying the Hazus loss estimation model to obtain damage, loss, and functionality information, 4) assessing lifeline interdependencies of the hospitals in the region to understand their resilience, including water, transportation, fuel, electricity, and communications, and 5) writing this report.

The project region, which stretches about 50 miles from coastal Lincoln City to McMinnville in the Willamette Valley, has a high seismic hazard due to the close proximity to the Cascadia subduction zone and its potential to trigger a magnitude 9 earthquake and tsunami. The area includes part of the Oregon Coast Range and sections of the Yamhill River and several other rivers. The area has a population of approximately 96,000 people. Key project facilities include two hospitals, five water systems, and sections of U.S. Highway 101 and Oregon Highway 18 between Lincoln City and McMinnville.

The DOGAMI earthquake model for this study included 1,000-year probabilistic ground-shaking motions, which incorporate Cascadia earthquakes, soils that may amplify ground shaking levels, coseismic landslide hazards, and liquefaction hazards.