1. Risk Assessment Maps for Seaside OR
G 148 Fall 2016

2. Seaside Oregon Base Map

3. Historic Seismicity & Faults

4. Hazard: Cascadia Subduction Zone Shaking

5. Hazard: Expected Earthquake Shaking

6. Hazard: Tsunami

7. Hazard: Liquefaction

8. Hazard: Landslide

9. Overall Hazard
Very High
High
Medium

10. 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

11. Vulnerability: Buildings

12. Overall Vulnerability
High
Medium

13. 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

14. Overall Risk
High
Medium
Low

15. 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

16. Information Sources
Oregon Department of Geology and MIneral Industries (DOGAMI) Hazard Viewer
Accessed 11/23/2016