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 impeda...

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Bibliographic Details
Published in:Geophysical journal international 2010-07, Vol.182 (1), p.368-374
Main Authors: Frassetto, A., Zandt, G., Gilbert, H., Owens, T. J., Jones, C. H.
Format: Article
Language:English
Subjects:
Arrays
Arrivals
Conversion
Crustal structure
Image processing
Interface waves
Noise
Receivers
Seismic phenomena
Site effects
Stacks
Wave scattering and diffraction
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Summary: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.
ISSN:0956-540X
1365-246X
DOI:10.1111/j.1365-246X.2010.04617.x