Probabilistic seismic and tsunami hazard analysis (PSTHA) conditioned on a mega-thrust rupture of the Cascadia Subduction Zone

Published

June 15, 2017

Author(s)

Hyoungsu Park, Daniel Cox, Mohammad S. Alam, Andre Barbosa

Abstract

This paper presents a framework for a probabilistic hazard assessment for the multi-hazard seismic and tsunami phenomena (PSTHA). For this work, we consider a full-rupture event along the Cascadia Subduction Zone and apply the methodology to the study area of Seaside, Oregon, along the US Pacific Northwest coast. In this work, we show that the annual exceedance probabilities (AEP) of the tsunami intensity measures (IM) are qualitatively dissimilar to the IMs of the seismic ground motion in the study area. Specifically, the spatial gradients for the tsunami IM are much stronger across the length scale of the city owing to the physical differences of energy dissipation of the two mechanisms. Example results of probabilistic seismic hazard analysis (PSHA) and probabilistic tsunami hazard analysis (PTHA) are shown for three observation points in the study area of Seaside.

Citation

Frontiers in Built Environment

Pub Type

Journals

Download Paper

https://doi.org/10.3389/fbuil.2017.00032

Keywords

seismic, mega quake, resilience, community resilience

Citation

Park, H. , Cox, D. , Alam, M. and Barbosa, A. (2017), Probabilistic seismic and tsunami hazard analysis (PSTHA) conditioned on a mega-thrust rupture of the Cascadia Subduction Zone, Frontiers in Built Environment, [online], https://doi.org/10.3389/fbuil.2017.00032 (Accessed October 9, 2025)