Site response from incident Pnl waves

We developed a new method of determining site response and amplification for use in hazard analysis and station corrections. The method employs the conversion of P to S energy beneath a soft-rock station, which results in complex receiver functions that are frequency and amplitude dependent. At low frequencies (<0.1 Hz), the ratio of vertical to radial energies for Pnl appear uniform across the TriNet array, where shallow structures can be neglected. Ratios of high-frequency energies (>0.5 Hz) can be normalized to these low-frequency levels to quantify the amount of high-frequency amplification. Our results agree with previous studies of the Los Angeles Basin and provide the means of calibrating station responses at high frequencies.