The most of large earthquakes (magnitude 8 or more) are occurred in plate subduction zones in the world. Recent our acoustic imaging technology of deep interior of the earth can image even the depth of seismogenic plate boundary in 3-D. Japan – France cooperated investigation on the Tokai seismogenic zone was conducted in 2000. We had a 45×5km 3-D reflection seismic data and processed the data by using the AIST’s super computer facility. Our preliminary geological interpretation suggests that the up-dip limit of seismogenic zone was clearly imaged. It is characterized by out-of-sequence thrusts that show a splay-like structure. Our interpretation is concordant with the result of geodetic inversion study of on-land GPS network data.
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| Figure shows the 3-D seismic survey area off Tokai, approximately 50km far from Omaesaki in SW direction. The size of survey area is 4×5km |
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| Relational Information |
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AIST TODAY Vol.2, No.4 (2002) p.12
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No.5 Summer 2002
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