Work

Mapping the near-field scattered energy in sedimentary basins from ambient noise correlations

Year: 2025

Type: article

Abstract: Precursory spurious arrivals, commonly observed in ambient noise correlations, are generated by near-field noise sources. We have developed an inversion method to evaluate the noise source distribution based on the precursory waves. This method is applied to the BASIN experiment in Los Angeles, revealing that the noise sources show coherent patterns with features like faults and structure boundaries. Our spectral analysis indicates that the energy of the noise source in generating the precursory signal is predominant at higher frequencies, suggesting a shallow source(¡200m). We conclude that near-field noise is primarily produced by scattering from geological structures with significant velocity contrasts, such as faults at shallow depths. This method offers a new way to map faults using ambient noise correlations.

Source: Geophysical Journal International

DOI: 10.1093/gji/ggaf170

Authors: Yida Li, Robert W Clayton, Valeria Villa

Institutions: California Institute of Technology, Centre National de la Recherche Scientifique, Université Paris-Saclay, Fluides, Automatique et Systèmes Thermiques

Language: English

Topic: Seismic Waves and Analysis

Subfield: Geophysics

Field: Earth and Planetary Sciences

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,416

Funders: National Science Foundation, Southern California Earthquake Center, U.S. Geological Survey