Group B, Poster #008, Seismology
Internal Structure of Southern San Andreas Fault Zone from Traffic Signals recorded by a Dense Seismic Array
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Poster Presentation
2022 SCEC Annual Meeting, Poster #008, SCEC Contribution #12000 VIEW PDF
igh wave propagation in the two 2-D subarrays to the railway using the vertical component waveforms in a series of moving windows. We then stably measure the Rayleigh wave velocity according to the delay time and wave propagation direction for each neighboring station pair by averaging through multiple time windows. The results indicate a low-velocity zone around BF and a velocity reduction of over 45% across MCF towards the northeast. We further resolve about 10% density reduction using the amplitude ratio as well as incident and refracted angles across the bi-material interface at MCF. By employing the resolved Rayleigh wave velocity, we further model the amplitude decay and estimate the attenuation structure across the linear array. The derived Q-values show strong attenuation around the two fault strands as well as in the sediments of a local riverbed.
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