3D crustal structure and long-period ground motions from a M9.0 megathrust earthquake in the Pacific Northwest region

Journal of Seismology
By: , and 

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Abstract

We have developed a community velocity model for the Pacific Northwest region from northern California to southern Canada and carried out the first 3D simulation of a Mw 9.0 megathrust earthquake rupturing along the Cascadia subduction zone using a parallel supercomputer. A long-period (<0.5 Hz) source model was designed by mapping the inversion results for the December 26, 2004 Sumatra–Andaman earthquake (Han et al., Science 313(5787):658–662, 2006) onto the Cascadia subduction zone. Representative peak ground velocities for the metropolitan centers of the region include 42 cm/s in the Seattle area and 8–20 cm/s in the Tacoma, Olympia, Vancouver, and Portland areas. Combined with an extended duration of the shaking up to 5 min, these long-period ground motions may inflict significant damage on the built environment, in particular on the highrises in downtown Seattle.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title 3D crustal structure and long-period ground motions from a M9.0 megathrust earthquake in the Pacific Northwest region
Series title Journal of Seismology
DOI 10.1007/s10950-007-9082-y
Volume 12
Issue 2
Year Published 2008
Language English
Publisher Springer
Publisher location Amsterdam, Netherlands
Contributing office(s) Earthquake Hazards Program, Geologic Hazards Science Center
Description 15 p.
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Journal of Seismology
First page 145
Last page 159
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