Title

Improved imaging with phase-weighted common conversion point stacks of receiver functions

Abstract

Broad-band array studies frequently stack receiver functions to improve their signal-to-noise ratio while mapping structures in the crust and upper mantle. Noise may produce spurious secondary arrivals that obscure or mimic arrivals produced by P-to-S conversions at large contrasts in seismic impedance such as the Moho. We use a Hilbert transform to calculate phase-weights, which minimize the constructive stacking of erroneous signal in receiver function data sets. We outline this approach and demonstrate its application through synthetic data combined with different types of noise, a previously published example of signal-generated noise, and a large data set from the Sierra Nevada EarthScope Project. These examples show that phase-weighting reduces the presence of signal-generated noise in receiver functions and improves stacked data sets.

Keywords

Image processing, Interface waves, Site effects, Wave scattering and diffraction, Crustal structure

Date of this Version

2010

DOI

10.1111/j.1365-246X.2010.04617.x

Volume

182

Issue

1

Pages

368-374

Link Out to Full Text

http://onlinelibrary.wiley.com/doi/10.1111/j.1365-246X.2010.04617.x/abstract