Risk Assessment Maps for Seaside OR G 148

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 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