Imaging the Seattle Fault Zone with high-resolution seismic tomography
Geophysical Research Letters
By: A.J. Calvert and M. A. Fisher
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Abstract
The Seattle fault, which trends east-west through the greater Seattle metropolitan area, is a thrust fault that, around 1100 years ago, produced a major earthquake believed to have had a magnitude greater than 7. We present the first high resolution image of the shallow P wave velocity variation across the fault zone obtained by tomographic inversion of first arrivals recorded on a seismic reflection profile shot through Puget Sound adjacent to Seattle. The velocity image shows that above 500 m depth the fault zone extending beneath Seattle comprises three distinct fault splays, the northernmost of which dips to the south at around 60??. The degree of uplift of Tertiary rocks within the fault zone suggests that the slip-rate along the northernmost splay during the Quaternary is 0.5 mm a-1, which is twice the average slip-rate of the Seattle fault over the last 40 Ma.
Suggested Citation
Calvert, A., and Fisher, M.A., 2001, Imaging the Seattle Fault Zone with high-resolution seismic tomography: Geophysical Research Letters, v. 28, no. 12, p. 2337-2340, https://doi.org/10.1029/2000GL012778.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Imaging the Seattle Fault Zone with high-resolution seismic tomography |
| Series title | Geophysical Research Letters |
| DOI | 10.1029/2000GL012778 |
| Volume | 28 |
| Issue | 12 |
| Publication Date | June 15, 2001 |
| Year Published | 2001 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Geophysical Research Letters |
| First page | 2337 |
| Last page | 2340 |