Geometry of the Los Angeles Basin Using Full H/V Spectral Ratio Inversion

Zack Spica, Mathieu Perton, Robert W. Clayton, & Gregory C. Beroza

Published July 24, 2017, SCEC Contribution #7330, 2017 SCEC Annual Meeting Poster #026

The H/V spectral ratio (HVSR) of the auto-correlated signal at a seismic station is proportional to the ratio of the imaginary parts of the Green's functions. Following this approach, observations of H/V can be compared to their theoretical counterpart for a locally layered elastic media in order to constrain the velocity structure. We use the broadband stations of the “Los Angeles Syncline Seismic Interferometry Experiment” (LASSIE) to perform a combined inversion of multiple HVSR measurements and dispersion curves. Because HVSR exhibit low frequency peaks, we expect them to be sensitive to the deep structure of the basin, which should allow us to assess its geometry along a 2D line. The goal of this research is to improve the characterization of basin structure and therefore a path for improving the predictive power of SCEC ground motion simulations.

Key Words
HVSR, LASSIE, Los Angeles Bassin

Citation
Spica, Z., Perton, M., Clayton, R. W., & Beroza, G. C. (2017, 07). Geometry of the Los Angeles Basin Using Full H/V Spectral Ratio Inversion. Poster Presentation at 2017 SCEC Annual Meeting.

Related Projects & Working Groups
Seismology