Improved surface?wave retrieval from ambient seismic noise by multi?dimensional deconvolution

Journal article (2011)
Department
Geotechnology (CEG) (TU Delft)
Copyright: American Geophysical Union
More Info
expand_more

Published Date

15-01-2011

Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Source:

Geophysical Research Letters, 38, 2011

Faculty

Civil Engineering and Geosciences

Department

Geotechnology

Abstract

The methodology of surface?wave retrieval from ambient seismic noise by crosscorrelation relies on the assumption that the noise field is equipartitioned. Deviations from equipartitioning degrade the accuracy of the retrieved surface?wave Green's function. A point?spread function, derived from the same ambient noise field, quantifies the smearing in space and time of the virtual source of the Green's function. By multidimensionally deconvolving the retrieved Green's function by the point?spread function, the virtual source becomes better focussed in space and time and hence the accuracy of the retrieved surface?wave Green's function may improve significantly. We illustrate this at the hand of a numerical example and discuss the advantages and limitations of this new methodology.