Active tectonics of the Seattle fault and central Puget sound, Washington - Implications for earthquake hazards
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Abstract
We use an extensive network of marine high-resolution and conventional industry seismic-reflection data to constrain the location, shallow structure, and displacement rates of the Seattle fault zone and crosscutting high-angle faults in the Puget Lowland of western Washington. Analysis of seismic profiles extending 50 km across the Puget Lowland from Lake Washington to Hood Canal indicates that the west-trending Seattle fault comprises a broad (4–6 km) zone of three or more south-dipping reverse faults. Quaternary sediment has been folded and faulted along all faults in the zone but is clearly most pronounced along fault A, the northernmost fault, which forms the boundary between the Seattle uplift and Seattle basin. Analysis of growth strata deposited across fault A indicate minimum Quaternary slip rates of about 0.6 mm/yr. Slip rates across the entire zone are estimated to be 0.7–1.1 mm/yr.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Active tectonics of the Seattle fault and central Puget sound, Washington - Implications for earthquake hazards |
| Series title | Geological Society of America Bulletin |
| DOI | 10.1130/0016-7606(1999)111<1042:ATOTSF>2.3.CO;2 |
| Volume | 111 |
| Issue | 7 |
| Year Published | 1999 |
| Language | English |
| Publisher | Geological Society of America |
| Description | 12 p. |
| First page | 1042 |
| Last page | 1053 |
| Country | United States |
| State | Washington |
| Other Geospatial | Puget Sound |
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