Abstract
We develop and test a method to estimate local Vp/Vs ratios for compact
similar earthquake clusters using the precise P and S differential
times obtained using waveform cross-correlation. We demonstrate how
our technique works using synthetic data and evaluate likely errors
arising from near-source takeoff angle differences between P and
S waves. We use a robust misfit function method to compute Vp/Vs
ratios for both synthetic data sets and several similar event clusters
in southern California, and use a bootstrap resampling approach to
estimate standard errors for real data. Our technique has higher
resolution for near-source Vp/Vs ratios than typical tomographic
inversion methods and provides constraints on near-fault rock properties.
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