Comparisons of tsunami inundation for homogeneous and heterogeneous earthquake sources at selected sites for the Cascadia Subduction Zone

Authors

  • Sean Santellanes Department of Earth Sciences, University of Oregon, Eugene, Oregon, USA
  • Diego Melgar Department of Earth Sciences, University of Oregon, Eugene, Oregon, USA
  • Bruno Adriano International Research Institute of Disaster Science, Tohoku University, Sendai, Miyagi, Japan https://orcid.org/0000-0002-4318-4319
  • Brendan Crowell School of Earth Sciences, The Ohio State University, Columbus, Ohio, USA https://orcid.org/0000-0001-7096-601X
  • Ronald Eguchi ImageCAT Inc., Long Beach, California, USA
  • Shunichi Koshimura International Research Institute of Disaster Science, Tohoku University, Sendai, Miyagi, Japan https://orcid.org/0000-0002-8352-0639

DOI:

https://doi.org/10.26443/seismica.v2i4.1584

Keywords:

subduction zone, tsunami modeling

Abstract

Tsunami hazard severity — especially tsunami inundation depth — is related to the tsunami’s source mechanism. Traditionally, homogeneous earthquake rupture sources have been used as the source mechanism for tsunamis generated in the Cascadia Subduction Zone for regional hazard assessment. We show with 200 heterogeneous earthquake rupture sources how tsunami inundation hazards change for three sites located along the Cascadia Subduction Zone when the assumption of homogeneous slip is relaxed. Our results indicate that the tsunami inundation limit extends further inland compared to homogeneous sources. We also note that the 1-in-2475-year exceedance threshold extends further inland for heterogeneous earthquake rupture sources compared to official tsunami evacuation lines and the American Society of Civil Engineers tsunami design zone.

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Seismica cover image for Volume 2, Number 4: The Cascadia Subduction Zone: Grand Challenges and Research Frontiers. Image shows a hemispherical white dome on a four-legged stand on a rocky mountain peak. In the far distance, a series of sharp rocky and snowy peaks stretches toward the setting sun which is refracted through thin clouds.

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2026-10-21

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Santellanes, S., Melgar, D., Adriano, B., Crowell, B., Eguchi, R., & Koshimura, S. (2026). Comparisons of tsunami inundation for homogeneous and heterogeneous earthquake sources at selected sites for the Cascadia Subduction Zone. Seismica, 2(4). https://doi.org/10.26443/seismica.v2i4.1584

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