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   The National Research Institute for Earth Science and Disaster Resilience (NIED) has developed software that shows the NIED standard three-dimensional velocity structure beneath Japanese Islands that was determined using data from the NIED high sensitivity seismograph network (Hi-net). Among other things, this model shows the Pacific and Philippine Sea Plates subducting beneath the Japanese Islands. This software allows the user to produce an image of the velocity structure at any given location. Earthquake hypocenters, focal mechanisms, and P- and T-axis can be overlain given an input file. This software runs on Windows 7, Windows 8, and Macintosh.

Download   [Download size: 31MB -- Last Updated 2014/07/22]

   This velocity model was published in Earth Planets and Space and is open to public. If you use the figures with this software, refer to the following paper:
   Matsubara, M. and K. Obara, The 2011 Off the Pacific Coast of Tohoku earthquake related to a strong velocity gradient with the Pacific plate, Earth Planets Space, 63, 663-667, 2011

This velocity model is also open to public (only in Japanese).


Notice:

  • NIED has no responsibility whatsoever for any direct or indirect damage or loss caused by the using this software.


  • ▌Figure 1 Default input image.
    Figure 1

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    ▌Figure 2 Input image for depth slice at 40 km of P-wave velocity (Vp) perturbation beneath Kanto region.
    Figure 2
    ▌Figure 3 Depth slice at 40 km of Vp perturbation beneath Kanto region. E-W low-velocity (low-V) zone exists.
    Figure 3

    ▌Figure 4 Input image for vertical cross section of Vp perturbation beneath northeastern Japan.
    Figure 4
    ▌Figure 5 Vertical cross section of Vp perturbation beneath northeastern Japan. High-velocity (high-V) subducting Pacific plate is imaged.
    Figure 5
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    ▌Figure 6 Input image for vertical cross section of Vp perturbation beneath central Japan.
    Figure 6
    ▌Figure 7 Vertical cross section of Vp perturbation beneath central Japan. High-V subducting Philippine Sea plate is imaged.
    Figure 7

    ▌Figure 8 Input image for overlaying users' hypocenter catalog.
    Figure 8
    ▌Figure 9 Vertical cross section of Vp perturbation with hypocenters (gray dots) beneath central Japan.
    Figure 9
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    ▌Figure 10 Input image for showing focal mechanisms, P- and T-axes.
    Figure 10
    ▌Figure 11 Vertical cross section of Vp perturbation with focal mechanisms, P- and T-axes beneath central Japan. Red and blue lines denote P- and T- axes, respectively.
    Figure 11

    ▌Figure 12 Input image for showing crossing line to fault plane.
    Figure 12
    ▌Figure 13 Vertical cross section of Vp perturbation with crossing line to fault plane. Brown line in the lower panel is the crossing line to the fault plane. Thick brown line in the top panel show the top of the fault the users inputted. Brown rectangle is the map view of the fault plane.
    Figure 13
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