Ambient noise differential adjoint tomography reveals fluid-bearing rocks near active faults in Los Angeles

Xin Liu (), Gregory C. Beroza () and Hongyi Li
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Xin Liu: University of Hong Kong
Gregory C. Beroza: Stanford University
Hongyi Li: Key Laboratory of Intraplate Volcanoes and Earthquakes (China University of Geosciences, Beijing), Ministry of Education

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-42536-4

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