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Three-dimensional P- and S- wave velocity structures beneath the Japan Islands obtained by high-density seismic stations by seismic tomography

The National Research Institute for Earth Science and Disaster Prevention (NIED) has developed a software which easily indicates the result of the estimated standard three-dimensional P- and S-wave velocity structures beneath the Japan Islands based on the data of the Hi-sensitivity Seismograph Network (Hi-net) and opened its software to the public. There are two oceanic plates subducting beneath Japan; the Pacific plate and the Philippine Sea plate, and we could image them with the high-velocity zone in the three-dimensional P- and S-wave velocity structures.In this software, it is possible to indicate the horizontal or vertical cross section of the P- and S-wave velocity structures at areas where you specify the depth and the location on map. Moreover, by inputting information of hypocenter and focal mechanism, it became much easier to indicate the hypocenter distribution and the direction of the stress at the hypocenter.
This research result on the standard three-dimensional P- and S-wave velocity structures has been published online on the “Tectonophysics” of the Elsevier website.

The URL below refers to the web page of the "Tectonophysics".

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