Imaging the San Gabriel and San Bernardino Basins with short-term Nodal deployments

Robert W. Clayton, Fan-Chi Lin, Marine A. Denolle, Patricia Persaud, & Jascha Polet

Published August 8, 2017, SCEC Contribution #7441, 2017 SCEC Annual Meeting Poster #029

We report on three seismic profiles across the San Gabriel and San Bernardino Basins (Northern Basins) in the Los Angeles Region that were run in the first quarter of 2017. The motivation for the survey is to better characterize the funneling of energy from southern San Andreas earthquakes into the downtown Los Angeles area through the Northern Basins as reported in Denolle et al. (2014). The goal is to develop detailed 3D models of the basins that improves seismic velocities and the shape of the sediment-basement interface. To conduct the surveys, we used 3-component nodes that were deployed for the most part on private properties for approximately one month. With these data we plan to use ambient-noise surface waves to estimate the S-wave velocities and receiver functions as well as spectral ratio analysis to determine basement depths. During the initial phase of this project, we recorded two profiles across the San Gabriel basin with 50 and 60 nodes respectively, and one across the San Bernardino basin with 92 nodes. We will show ambient noise correlations and the recordings of two significant teleseismic events, in addition to any preliminary results that are available at the time of the meeting.

Key Words
Basin Structure, Urban Seismology, Ambient Noise

Clayton, R. W., Lin, F., Denolle, M. A., Persaud, P., & Polet, J. (2017, 08). Imaging the San Gabriel and San Bernardino Basins with short-term Nodal deployments. Poster Presentation at 2017 SCEC Annual Meeting.

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