Determination of the Near Surface Shear Wave Velocities in the Central Los Angeles Basin Using Dense Arrays
Session: Waveform Cross-Correlation-Based Methods in Observational Seismology [Poster]
Type: Poster
Date: 4/21/2021
Presentation Time: 03:45 PM Pacific
Description:
We investigate the shallow shear wave velocity structure of the Los Angeles Basin in southern California, using ambient noise correlations between five dense arrays and 21 broadband stations from the Southern California Seismic Network (SCSN). We observe clear fundamental mode and first overtone Rayleigh waves in the frequency band 0.25-2.0 Hz, and obtain group velocity maps through seismic tomography. We further derive a 3D shear wave velocity model, covering a large portion of the central LA Basin for the depths shallower than 3 km. We found that the small scale shallow velocity structure heterogeneities are better resolved compared with the SCEC Community velocity models. Our model captures the presence of the Newport-Inglewood fault by a NW-SE trending high velocity belt. Our model provides more accurate constraints on local ground motion predictions with detailed mapping of structural heterogeneities.
Presenting Author: Zhe Jia
Student Presenter: Yes
Authors
Zhe Jia Presenting Author Corresponding Author zjia@caltech.edu Caltech |
Robert Clayton clay@gps.caltech.edu Caltech |
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Determination of the Near Surface Shear Wave Velocities in the Central Los Angeles Basin Using Dense Arrays
Category
Waveform Cross-correlation-based Methods in Observational Seismology