Ambient noise Love wave attenuation tomography for the LASSIE array across the Los Angeles basin

Xin Liu, Gregory C. Beroza, Lei Yang, & William L. Ellsworth

Published May 2021, SCEC Contribution #10983

The Los Angeles Basin is located within the North America – Pacific plate boundary and contains multiple earthquake faults that threaten greater Los Angeles. Seismic attenuation tomography has the potential provide important constraints on wave propagation in the basin, and to provide supplementary information on structure in the form of the distribution of anelastic properties. Based on the amplitude information from seismic interferometry from the linear LASSIE array in Los Angeles Basin, we apply station-triplet attenuation tomography to obtain a 2D depth profile for the attenuation structure of the uppermost 0.6 km. The array crosses four Quaternary faults, three of which are blind. The attenuation tomography resolves strong attenuation (shear attenuation Qs ~ 20) for the fault zones and is consistent with sharp boundaries across them.

Citation
Liu, X., Beroza, G. C., Yang, L., & Ellsworth, W. L. (2021). Ambient noise Love wave attenuation tomography for the LASSIE array across the Los Angeles basin. Science Advances, 7(22). doi: 10.1126/sciadv.abe1030.