SEGJ Technical Conference

Interferometric seismic imaging of subsurface structures using earthquakes and ambient seismic noise - case study on continuous observation of earthquakes by seismometer array in Narita City, Chiba in Japan -

Abstract We applied the seismic interferometry to continuous observation records of local earthquakes and ambient seismic noise. In this study, we newly observed 116-day passive seismic data with a 5 km survey line with 250 m receiver intervals including a 1 km high-density survey line with 50 m intervals in Narita city, Chiba, Japan. By applying the deconvolution-type seismic interferometry on the P-coda of 437 local earthquakes, a high resolution reflection profile was obtained by CMP stacking method for the synthesized virtual shot record. In addition, by the cross-correlation of the 78-night ambient noise, Green's functions of the surface wave were synthesized, and then the reasonable phase velocity spectrum was calculated. Our results show that both the reflection profile and the S-wave velocity model along the survey line can be obtained as a result of the interferometric analysis of the passive data of the earthquakes and the ambient seismic noise with the same seismometer array linearly deployed.