Full-field multidimensional deconvolution to retrieve body-wave reflections from sparse passive sources

Full-field multidimensional deconvolution to retrieve body-wave reflections from sparse passive sources

Hartstra, I.E. (TU Delft Applied Geophysics and Petrophysics)
Almagro Vidal, C. (TU Delft Applied Geophysics and Petrophysics)
Wapenaar, C.P.A. (TU Delft Applied Geophysics and Petrophysics)

2017

Our objective is to complement lithospheric seismic tomography with an interferometric method to retrieve high-resolution reflectivity images from local earthquake recordings. The disadvantage of using local earthquakes for the retrieval of reflected body-waves is their usual sparse distribution. We propose an alternative formulation of passive seismic interferometry by multidimensional deconvolution (MDD) which uses the multiples in the full recordings to compensate for missing illumination angles. This method only requires particle-velocity recordings at the surface from passive transient sources and retrieves body-wave reflection responses without free-surface multiples. We conduct an acoustic modelling experiment to compare this formulation to a previous MDD method and Green’s function retrieval by crosscorrelation for different source distributions. We find that in the case of noise-contaminated recordings obtained under severely limited and irregular illumination conditions, the alternative MDD method introduced here still retrieves the complete reflection response without free-surface multiples where the other interferometric methods break down.

Interferometry
Body waves
Coda waves

http://resolver.tudelft.nl/uuid:19810c33-dcb1-48de-9eec-87376d1fa01c

https://doi.org/10.1093/gji/ggx120

0956-540X

Geophysical Journal International, 210 (2), 609-620

Institutional Repository

journal article

© 2017 I.E. Hartstra, C. Almagro Vidal, C.P.A. Wapenaar