Ambient noise differential adjoint tomography reveals fluid-bearing rocks near active faults in Los Angeles
In: Nature Communications, Jg. 14 (2023), Heft 1, S. 1-9
Online
academicJournal
Zugriff:
Abstract Water scarcity is a pressing issue in California. We develop ambient noise differential adjoint tomography that improves the sensitivity to fluid-bearing rocks by canceling bias caused by noise sources. Here we image the shallow S-wave velocity structure using this method beneath a linear seismic array (LASSIE) in Los Angeles Basin, which shows significant velocity reduction marking a major regional water producer, the Silverado aquifer, along with other fluid-bearing structures. Based on the S-wave tomography and previous P-wave studies, we derive the porosity in Long Beach and discover that the rock from 1-2 km depth surrounding the Newport-Inglewood Fault contains abundant fluids with pore-fluid fraction ~0.33. The high-porosity rock around the fault coincides with previously observed week-long shallow seismicity south of LASSIE array in Long Beach. The imaged S-wave velocity in the top layer shows a similar trend in the geotechnical layer Vs 30, suggesting additional applications to ground motion prediction.
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Ambient noise differential adjoint tomography reveals fluid-bearing rocks near active faults in Los Angeles
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Autor/in / Beteiligte Person: | Liu, Xin ; Beroza, Gregory C. ; Li, Hongyi |
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Zeitschrift: | Nature Communications, Jg. 14 (2023), Heft 1, S. 1-9 |
Veröffentlichung: | Nature Portfolio, 2023 |
Medientyp: | academicJournal |
ISSN: | 2041-1723 (print) |
DOI: | 10.1038/s41467-023-42536-4 |
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