This note documents an approach to process a suite of receiver function (RF) traces in order to identify discontinuity-generated P-to-S (Ps) conversions based on the timing of their associated reverberations. It is inspired by Kumar and Bostock's method to estimate absolute P wave speeds. From RF estimates recorded in the typical source range for direct P arrivals, the method yields P to S wave speed ratios (VP/VS) without knowledge of crustal VP or thickness.
Helffrich, G., & Thompson, D. (2010). A stacking approach to estimate Vp/Vs from receiver functions. Geophysical Journal International, 182(2), 899-902. https://doi.org/10.1111/j.1365-246X.2010.04628.x