第24回ジオダイナミクスセミナー
　　　Geodynamics　Seminar

　「Seismic tomography of Northeast India and
　　　its implication to seismotectonics」
　
　　　　　　　　 　　　
　講　師：Dr.O.P.Singh（Geological Survey of India,
　　 　　　　　　　　　　Calcutta,　India)
　　

　　　　　主催　：　愛媛大学地球深部ダイナミクス研究センター
　　　　　日時　：　２００１年１１月１６日（金）　午後17時〜
　　　　　場所　：　愛媛大学理学部講義棟　２０１教室

　　　　　　　　

要　旨
　Northeast India is bounded by the Himalayan arc to the north and the Burmese arc to the east. The present day tectonics of this part of India is complicated because of collision and continued north-south convergence along the Himalayan arc. For a better understanding of the tectonic activities of the area we have attempted to determine P- and S- velocity and Poisson’ s ratio structures using Zhao et al.(1992) tomographic method. The micro-earthquake data recorded by Indian seismological networks during 1986-2000 have been used for this study. About 4000 high quality P- and S- wave arrival time data from selected 587 events was used for this study.
　Our results show significant lateral heterogeneities in the study area. Tomography images obtained are compatible with the major tectonic features such as active faults and seismic trends. The encouraging results provide us an impetus to carry out more extensive tomographic research in this seismically active zone of India in near future.



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