Body-wave interferometry using regional earthquakes with multidimensional deconvolution after wavefield decomposition at free surface

Passive seismic methods using earthquakes can be applied for extracting body waves andobtaining information of subsurface structure. In this study, we retrieve direct and reflectedplane waves by applying seismic interferometry to the recorded ground motion from a clusterof regional earthquakes. We apply upgoing/downgoing P/S wavefield decomposition, timewindowing, and multidimensional deconvolution to improve the quality of the extraction ofreflected waves with seismic interferometry. The wavefield separation and seismic interferometrybased on multidimensional deconvolution allow us to reconstruct PP, PS, SP and SSreflected waves without unwanted crosstalk between P and S waves. From earthquake data,we obtain PP, PS and SS reflected plane waves that reflect off the same reflector, and estimateP- and S-wave velocities.