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Imaging Lateral Boundaries in the San Bernardino and San Gabriel Basins With Scattered Phases in Ambient Noise Data

Description: 

The Northern Los Angeles Basin Seismic Experiments were a series of nodal seismic deployments performed between 2017 and 2019. The deployments included nine linear subarrays which collectively spanned the San Gabriel and San Bernardino basins. We consider ambient noise cross-correlations along these linear subarrays, with the aim of imaging sharp lateral structures, such as basin boundaries and faults. We stack raw data from each subarray along lines of constant slowness and correlate the output with each individual node. For any given frequency band, these cross-correlations distinguish how surface waves approaching the subarray at a particular azimuth are expected to propagate across each sensor, including any phases scattered off nearby faults. The moveout and polarity of these scattered phases across the lines provides insights into the azimuth of the faults and material contrast across the boundaries, respectively. This approach may prove especially powerful in locating hidden faults which do not show a clear surface expression and cannot be easily imaged through their seismicity. Improved resolution of fault structures near these arrays can aid our understanding of the seismic hazard and geologic history within the San Gabriel and San Bernardino basins.

Session: Earth’s Structure from the Crust to the Core [Poster]

Type: Poster

Date: 4/16/2025

Presentation Time: 08:00 AM (local time)

Presenting Author: Eli

Student Presenter: Yes

Invited Presentation: 

Poster Number: 89

Authors