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- W2322279269 abstract "Recent seismic reflection and refraction data reveal the Nankai trough structure as mega-thrust seismogenic zones. The subducted ridge in Tokai seismogenic zone is extended to the coseismic rupture zone of the 1944 Tonankai earthquake. This ridge appears to be in close contact with the seaward end of the rigid backstop of the Tonankai segment. In westward of subducted ridge, splay faults are distributed as the controller of rupture propagation at the seaward end of the 1944 Tonankai earthquake. A series of three earthquakes of magnitude about 7 have occurred off the Kii Peninsula in September 2004. The seismicity is generally so low that the occurrence of these large earthquakes within short intervals off the Kii Peninsula is an uncommon. As an urgent research project by MEXT, we carried out multi-channel seismic survey and aftershock observation around the epicenter area of these earthquakes. The purpose of this urgent research survey is to improve deterministic resolutions of aftershock hypocenter using high quality seismic imaging. In previous research, we have carried out multi-channel seismic survey in this area in 2002, so we could examine the differences of seismic imaging between preseismic and postseismic stages of these earthquakes. As the results of seismic surveys, the resolution of hypocenter determination was improved using the seismic image, so that distributions of aftershocks are clearly classified into two clusters which are located in oceanic crust and uppermost mantle. We could detect some particular images such as thrust faults and strike slip faults imaged near hypocenters in subducting oceanic crust and accretionary prism. In future study, we will elucidate the relation between fault imaging derived from seismic survey and these earthquakes off the Kii peninsula." @default.
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- W2322279269 date "2006-01-01" @default.
- W2322279269 modified "2023-10-18" @default.
- W2322279269 title "Crustal Structure and Urgent Aftershock Observation of the 2004 Off Kii-Peninsula Earthquake" @default.
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- W2322279269 doi "https://doi.org/10.4294/zisin.59.187" @default.
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