탄성파 간섭파를 이용한 가상 음원모음 연구

Abstract

Seismic coda wave is the tail part of recorded seismogram which are the strongly scattered in inhomogeneous media. The cross-correlation of two signals from different receivers in the same domain are used to find out impulse response. For imaging subsurface, we can use the impulse response. In this study we calculated cross-correlation and virtual source gathers using seismic coda wave for synthetic and field data. For the synthetic data we use an ocean bottom seismic model (OBS). In order to make a virtual shot gather we define the first trace of the synthetic data from OBS model as a virtual source and performed the cross-correlation of the virtual source and every shot gather. For application of field data set, we choose a data set which it has the high amplitudes (Bottom Simulating Reflection: BSR) and made cross-correlation gathers and virtual source section. The gas zone on the stack image is shown in the cross-correlation section and the BSR on the stack image is also shown strong reflection amplitudes on the virtual shot gather