Risk Assessment Maps for Seaside OR G 148 Fall 2016

Seaside Oregon Base Map

Historic Seismicity & Faults

Hazard: Cascadia Subduction Zone Shaking

Hazard: Expected Earthquake Shaking

Hazard: Tsunami

Hazard: Liquefaction

Hazard: Landslide

Overall Hazard Very High High Medium

Hazard Level Reasoning VERY HIGH Area subject to infrequent violent earthquake shaking, along with accompanying tsunami HIGH Area subject to infrequent severe earthquake shaking along with more frequent landslides MEDIUM Area subject to infrequent violent earthquake shaking

Vulnerability: Buildings

Overall Vulnerability High Medium

Vulerability Reasoning HIGH Area of high population density and buildings including hospitals and schools, seasonal/weekly/holiday fluctuations in population due to tourism MEDIUM Areas with roads NO VULNERABILITY Area with low population density, no buildings, roads or other infrastructure

Overall Risk High Medium Low

Risk Reasoning HIGH Very high hazard due to earthquake shaking and tsunami, high vulnerability due to high population and building density however population fluctuates with tourism MEDIUM Access roads subject to landslides triggered by earthquakes or storms LOW Access roads subject to liquefaction due to earthquakes NONE No vulnerability due to no population, buildings or infrastructure

Information Sources Oregon Department of Geology and MIneral Industries (DOGAMI) Hazard Viewer http://www.oregongeology.org/hazvu/ Accessed 11/23/2016