Dynamic models of an earthquake and tsunami offshore Ventura, California

Geophysical Research Letters
UC Riverside
By: , and 

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Abstract

The Ventura basin in Southern California includes coastal dip-slip faults that can likely produce earthquakes of magnitude 7 or greater and significant local tsunamis. We construct a 3-D dynamic rupture model of an earthquake on the Pitas Point and Lower Red Mountain faults to model low-frequency ground motion and the resulting tsunami, with a goal of elucidating the seismic and tsunami hazard in this area. Our model results in an average stress drop of 6 MPa, an average fault slip of 7.4 m, and a moment magnitude of 7.7, consistent with regional paleoseismic data. Our corresponding tsunami model uses final seafloor displacement from the rupture model as initial conditions to compute local propagation and inundation, resulting in large peak tsunami amplitudes northward and eastward due to site and path effects. Modeled inundation in the Ventura area is significantly greater than that indicated by state of California's current reference inundation line.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Dynamic models of an earthquake and tsunami offshore Ventura, California
Series title Geophysical Research Letters
DOI 10.1002/2015GL064507
Volume 42
Issue 16
Year Published 2015
Language English
Publisher Wiley
Contributing office(s) Pacific Coastal and Marine Science Center
Description 8 p.
First page 6599
Last page 6606
Country United States
State California
Other Geospatial Ventura, California
Online Only (Y/N) N
Additional Online Files (Y/N) N