Modeling the 1100 bp paleotsunami in Puget Sound, Washington

Shunichi Koshimura, Harold O. Mofjeld, Frank I. González, Andrew L. Moore

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Recent paleoseismic and geologic studies indicate that a tsunami occurred 1100 years ago in Puget Sound. This study aims to reproduce and validate the model tsunami, using a finite difference model based on nonlinear shallow water theory and abathymetry/topography computational grid that takes into account the 1-meter rise in sea level that has occurred in the region during the past 1100 years. Estimates of tsunami height, the extent of inundation, and the current velocity pattern are provided at the northern head of Cultus Bay, Whidbey Island, where paleotsunami sand deposits have been found. The model demonstrates that a tsunami generated when the background water level was at mean high water or above could have surged across the then-existing coastal marsh, penetrated the full length of the shallow bay, and deposited the observed sand layers.

Original languageEnglish
Article number1945
JournalGeophysical Research Letters
Volume29
Issue number20
DOIs
Publication statusPublished - 2002 Oct 15
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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