Synthesis of Green's function by seismic interferometry and subsurface imaging

Matsuoka Toshifumi, Shiraishi Kazuya

doi:10.3124/segj.61.133

We review theory of the seismic interferometry, and show some results by numerical simulations. The cross-correlation of two recordings of a wavefield at different receivers yields the Green's function between these receivers. By using this processing technique, we can use background noise as a signal which have been thought as undesirable noise in conventional seismic explorations, and can investigate the subsurface with controlled sources and a ingenious deployment of receivers adapted to an environment of a target field. Equations for synthesizing Green's function are derived from the reciprocity theorem and the principle of time reversal invariance. In this paper, we show the derivation of the equations, and basic equations for the seismic interferometry in an acoustic wavefield and in an elastic wavefield. The numerical simulations show examples of the synthesis of Green's functions by the seismic interferometry. The concept of stationary phase is important for retrieving seismic signals, and it is useful for planning the location of sources and receivers in a field. Because the seismic interferometry can simulate the simulated shot gather as many as the number of receivers used in an observation, we can image or analyze the subsurface from the simulated pseudo data. We show a numerical example of the subsurface imaging from a random wavefield in the ground. In near future, the seismic interferometry will be effectively used with ingenuity depending on an environment and a target.<br>

Synthesis of Green's function by seismic interferometry and subsurface imaging

Bibliographic Information

Search this article

Description

Journal

Citations (1)*help

References(38)*help

Keywords

Details 詳細情報について

Export

Report a problem