Improved imaging with phase-weighted common conversion point stacks of receiver functions
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.
Image processing, Interface waves, Site effects, Wave scattering and diffraction, Crustal structure
Date of this Version
Frassetto, A.; Zandt, G.; Gilbert, H.; Owens, T. J.; and Jones, C. H., "Improved imaging with phase-weighted common conversion point stacks of receiver functions" (2010). Department of Earth, Atmospheric, and Planetary Sciences Faculty Publications. Paper 43.
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