S/P amplitude ratios with Distributed Acoustic Sensing and application to earthquake focal mechanisms
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Abstract
Distributed acoustic sensing (DAS), which transforms a fiber optic cable into an array of high frequency strainmeters, has the potential to help us characterize earthquakes with a dense sampling of measurements. While earthquake focal mechanisms are frequently determined using P-wave polarities and S/P amplitude ratios with inertial seismometers, the dense sampling of DAS over potentially large portions of the focal sphere can aid our solutions. Here, we consider ∼200 regional earthquakes and thousands of S/P measurements on a DAS cable colocated with a network of inertial seismometers near Arcata, California. We demonstrate the S/P ratio measurements made on DAS are similar to those made on the inertial seismometers and can be used to constrain focal mechanism solutions.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | S/P amplitude ratios with Distributed Acoustic Sensing and application to earthquake focal mechanisms |
| Series title | Geophysical Research Letters |
| DOI | 10.1029/2025GL116373 |
| Volume | 52 |
| Issue | 20 |
| Publication Date | October 15, 2025 |
| Year Published | 2025 |
| Language | English |
| Publisher | American Geophysical Union |
| Contributing office(s) | Earthquake Science Center, Geologic Hazards Science Center - Seismology / Geomagnetism |
| Description | e2025GL116373, 8 p. |
| Country | United States |
| State | California |