3D crustal structure and long-period ground motions from a M9.0 megathrust earthquake in the Pacific Northwest region
Journal of Seismology
By: K.B. Olsen, W. J. Stephenson, and A. Geisselmeyer
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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.
| 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 |
| Google Analytic Metrics | Metrics page |