1 Boring Old Man

Seismic wave propagation recorded on High-Sensitivity seismograph network（Hi-net)

Credit: “Earthquake Research Institute, University of Tokyo”
*Above credit must be clearly mentioned for any secondary use.
Animation of the seismic wave propagation recorded on（Hi-net）

The maximum acceleration（PGA）of the earth surface was set up by using Hi-net observation data (Note that the seismograph near the focal region is saturated, and the value is not accurate). A strong acceleration of over 200 cm/s/s was observed in a broad area of 500km from the mid-Iwate to Ibaraki coast which is near the focal region.

The ground acceleration is decaying drastically on the west side at the border of Itoigawa-Shizuoka Tectonic Line. It suggests that the wave attenuated at around this area. (Click the left image to see the animation)

(By: Dr.Furumura and Dr.Takemura)

An visualized image of the seismic wave propagation of the off the Pacific coast of Tohoku Earthquake, using the data from 800 High-sensitivity seismograph network（Hi-net）located all over Japan. The intensity of ground motion is indicated visually with darkness of orange and its height.