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| | Abstract | | JCCS, commissioned from METI, deployed the permanent OBC (Ocean Bottom Cable),and seismic signal has been continuously recorded since July, 2014. The cable length and the receiver interval of the OBC are 3.6 km and 50 m, respectively. The main purposes of this observation are the earthquake monitoring and the time-lapse seismic survey, what is more, subsurface imaging by seismic interferometry can be implemented by using the continuously observed data in the arbitrary spans of the 6 years monitoring period. In this study, we applied the seismic interferometry to local earthquake seismograms recorded by the permanent OBC. We begin with synthesizing the pseudo shot gathers by applying seismic interferometry to the P-wave and P-coda of 158 earthquakes. Processing the pseudo shot gathers, we obtained the seismic images through the CMP stacking method. As a result, we can clearly image the reflector at the depth of the reservoir. It is necessary to examine the repeatability, the relation between the number of seismic events and S/N of the passive seismic section to confirm its applicability in CO2 monitoring. |
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