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

Journal of Seismology

By:
, , and
DOI: 10.1007/s10950-007-9082-y

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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
Description:
15 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Seismology
First page:
145
Last page:
159