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Shear Wave Velocities in the San Gabriel and San Bernardino Basins, California

Li, Yida and Villa, Valeria and Clayton, Robert W. and Persaud, Patricia (2022) Shear Wave Velocities in the San Gabriel and San Bernardino Basins, California. . (Unpublished)

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We construct a new shear velocity model for the San Gabriel, Chino and San Bernardino basins located in the northern Los Angeles area using ambient noise correlation between dense linear nodal arrays, broadband stations, and accelerometers. We observe Rayleigh wave and Love wave in the correlation of vertical (Z) and transverse (T) components, respectively. By combining Hilbert and Wavelet transforms, we obtain the separated fundamental and first higher mode of the Rayleigh wave dispersion curves based on their distinct particle motion polarization. Receiver functions, gravity, and borehole data are incorporated into the prior model to constrain the basin depth. Our 3D shear wave velocity model covers the upper 3 to 5 km of the basin structure in the San Gabriel and San Bernardino basin area. The Vs model is in agreement with the geological and geophysical cross-sections from other studies, but discrepancies exist between our model and a Southern California Earthquake Center (SCEC) community velocity model. Our shear wave velocity model shows good consistency with the CVMS 4.26 in the San Gabriel basin, but predicts a deeper and slower sedimentary basin in the San Bernardino and Chino basins than the community model.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Li, Yida0000-0003-0664-0247
Villa, Valeria0000-0002-0518-9143
Clayton, Robert W.0000-0003-3323-3508
Persaud, Patricia0000-0003-3462-7023
Additional Information:CC_BY_4.0. The authors thank Zhe Jia for help with the ambient noise correction code and helpful discussions. The authors thank all the volunteers who helped with deploying the dense nodal arrays. This research was supported by the National Science Foundation awards 2105358 and 210532. The BASIN project was partly supported by U.S. Geological Survey awards GS17AP00002 and G19AP00015, and Southern California Earthquake Center awards 18029 and 19033. Nodal instruments were provided by Incorporated Research Institutions for Seismology (IRIS), Portable Array Seismic Studies of the Continental Lithosphere (PASSCAL), University of Utah, Louisiana State University, and the University of Oklahoma. Data Availability. The final Vs model can be downloaded from All the node and temporary broadband data used in the study are scheduled to be available at the IRIS DMC by the end of 2022. The permanent strong motion and broad data are available from the Southern California Earthquake Data Center (SCEDC).
Group:Seismological Laboratory
Funding AgencyGrant Number
Southern California Earthquake Center (SCEC)18029
Southern California Earthquake Center (SCEC)19033
Record Number:CaltechAUTHORS:20220809-495535000
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:116189
Deposited By: George Porter
Deposited On:11 Aug 2022 16:07
Last Modified:11 Aug 2022 16:08

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