Monitoring Seismic Velocity Changes Across the San Jacinto Fault Using Train-Generated Seismic Tremors
© 2022. The Authors.
| Veröffentlicht in: | Geophysical research letters. - 1984. - 49(2022), 19 vom: 16. Okt., Seite e2022GL098509 |
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| 1. Verfasser: | |
| Weitere Verfasser: | , , , , , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2022
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| Zugriff auf das übergeordnete Werk: | Geophysical research letters |
| Schlagworte: | Journal Article Anza seismic gap body‐wave correlation functions hidden slow‐slip event long‐base seismic interferometry train‐generated seismic energy |
| Zusammenfassung: | © 2022. The Authors. Microseismic noise has been used for seismic velocity monitoring. However, such signals are dominated by low-frequency surface waves that are not ideal for detecting changes associated with small tectonic processes. Here we show that it is possible to extract stable, high-frequency body waves using seismic tremors generated by freight trains. Such body waves allow us to focus on small velocity perturbations in the crust with high spatial resolution. We report on 10 years of seismic velocity temporal changes at the San Jacinto Fault. We observe and map a two-month-long episode of velocity changes with complex spatial distribution and interpret the velocity perturbation as produced by a previously undocumented slow-slip event. We verify the hypothesis through numerical simulations and locate this event along a fault segment believed to be locked. Such a slow-slip event stresses its surroundings and may trigger a major earthquake on a fault section approaching failure |
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| Beschreibung: | Date Revised 09.09.2024 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 0094-8276 |
| DOI: | 10.1029/2022GL098509 |