Identification of multiple reflected phases from migration receiver function profile: An example for the INDEPTH-III passive teleseismic P waveform data

Abstract

The crustal multiple reflected phases usually interfere with those converted phases from the topmost mantle discontinuities, which make them difficult to be identified and should be carefully interpreted in a migration receiver functions profile. We propose a simple scheme to identify the crustal multiples in a migration receiver functions profile. The scheme is based on the differences in both geometric and dynamic features resolved using AVP (amplitude variation verse ray parameter) and DVP (discontinuity depth variation verse ray parameter). Synthetic data shows that the crustal multiples can be distinguished from those converted phases in the receiver function migration profile, especially when the receiver functions are migrated using velocities lower than the actual velocities. As an example, we apply our procedure to the INDEPTH-III passive teleseismic P waveform data. Our results indicate that a possible converted phase from the "220-km" discontinuity is a crustal multiple reflected phase. Copyright 2005 by the American Geophysical Union.