This research examined public perceptions of risk, behavioral intentions in the event of the M9
Cascadia Subduction Zone (CSZ) earthquake and tsunami on the Oregon Coast, and factors that
may influence both attitudes and intentions. A household survey was conducted to understand
public opinion in Seaside, Oregon, which is located within the impact radius of the CSZ earthquakes
and tsunamis. Mediation analysis was applied to evaluate relationships between the three levels of
variables to examine ways in which human decision-making occurs under conditions of risk.
Research results found a positive association between risk perception and evacuation behavioral
intention, suggesting that higher risk perception motivates people to be proactive and adopt
recommended actions of immediate evacuation in a local tsunami emergency. In addition, relying on
mediation analysis, the study found that cognitive constructs of response efficacy and self-efficacy
played a mediating role between socio-environmental factors and behavioral intention, supporting
arguments advocated by theories of cognition that attitudes translate outside influences into
behavioral intentions. Older individuals were identified as vulnerable to a local tsunami risk due to
their lower levels of risk perception, self-efficacy, and physical mobility capacities.