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Your search keyword '"Berg, Elizabeth M."' showing total 9 results
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9 results on '"Berg, Elizabeth M."'

1. Shallow Crustal Shear Velocity and Vp/Vs Across Southern California: Joint Inversion of Short‐Period Rayleigh Wave Ellipticity, Phase Velocity, and Teleseismic Receiver Functions

Author

Berg, Elizabeth M, Lin, Fan‐Chi, Schulte‐Pelkum, Vera, Allam, Amir, Qiu, Hongrui, and Gkogkas, Konstantinos

Subjects
Markov Chain Monte Carlo, Bayesian, Vp, Vs, Rayleigh, receiver function, Meteorology & Atmospheric Sciences
Abstract

Near-surface seismic velocity structure plays a critical role in ground motion amplification during large earthquakes. In particular, the local Vp/Vs ratio strongly influences the amplitude of Rayleigh waves. Previous studies have separately imaged 3D seismic velocity and Vp/Vs ratio at seismogenic depth, but lack regional coverage and/or fail to constrain the shallowest structure. Here, we combine three datasets with complementary sensitivity in a Bayesian joint inversion for shallow crustal shear velocity and near-surface Vp/Vs ratio across Southern California. Receiver functions–including with an apparent delayed initial peak in sedimentary basins, and long considered a nuisance in receiver function imaging studies–highly correlate with short-period Rayleigh wave ellipticity measurements and require the inclusion of a Vp/Vs parameter. The updated model includes near-surface low shear velocity more in line with geotechnical layer estimates, and generally lower than expected Vp/Vs outside the basins suggesting widespread shallow fracturing and/or groundwater undersaturation.

Published
2021

8. Nodal Seismograph Recordings of the 2019 Ridgecrest Earthquake Sequence

Author

Catchings, Rufus D., primary, Goldman, Mark R., additional, Steidl, Jamison H., additional, Chan, Joanne H., additional, Allam, Amir A., additional, Criley, Coyn J., additional, Ma, Zhenning, additional, Langermann, Daniel S., additional, Huddleston, Garet J., additional, McEvilly, Andrian T., additional, Mongovin, Daniel D., additional, Berg, Elizabeth M., additional, and Ben-Zion, Yehuda, additional

Published
2020
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