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.
Suggested Citation
Olsen, K., Stephenson, W.J., and Geisselmeyer, A., 2008, 3D crustal structure and long-period ground motions from a M9.0 megathrust earthquake in the Pacific Northwest region: Journal of Seismology, v. 12, no. 2, p. 145-159, https://doi.org/10.1007/s10950-007-9082-y.
| 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 |
| Publication Date | January 09, 2008 |
| 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 |