Abstract
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.