Seismic imaging beneath an InSAR anomaly in eastern Washington State: Shallow faulting associated with an earthquake swarm in a low-hazard area
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Abstract
In 2001, a rare swarm of small, shallow earthquakes beneath the city of Spokane, Washington, caused ground shaking as well as audible booms over a five‐month period. Subsequent Interferometric Synthetic Aperture Radar (InSAR) data analysis revealed an area of surface uplift in the vicinity of the earthquake swarm. To investigate the potential faults that may have caused both the earthquakes and the topographic uplift, we collected ∼3 km of high‐resolution seismic‐reflection profiles to image the upper‐source region of the swarm. The two profiles reveal a complex deformational pattern within Quaternary alluvial, fluvial, and flood deposits, underlain by Tertiary basalts and basin sediments. At least 100 m of arching on a basalt surface in the upper 500 m is interpreted from both the seismic profiles and magnetic modeling. Two west‐dipping faults deform Quaternary sediments and project to the surface near the location of the Spokane fault defined from modeling of the InSAR data.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Seismic imaging beneath an InSAR anomaly in eastern Washington State: Shallow faulting associated with an earthquake swarm in a low-hazard area |
| Series title | Bulletin of the Seismological Society of America |
| DOI | 10.1785/0120150295 |
| Volume | 106 |
| Issue | 4 |
| Year Published | 2016 |
| Language | English |
| Publisher | Seismological Society of America |
| Contributing office(s) | Geologic Hazards Science Center |
| Description | 9 p. |
| First page | 1461 |
| Last page | 1469 |
| Country | United States |
| State | Washington |
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