抄録
Simultaneous observations were carried out at Abuyama (bed rock), Nisseki (Diluvium), Aino (Alluvium) and Tonda (Alluvium), by using the vertical seismographs with same frequency response and magnification. As is generally known, the earthquake motions show strong attenuation on the bed rock, last long on the Alluvium and are intermediate on the Diluvium. But it is noted that the vibration energy concentrates at the time of S wave arrival on the Diluvium. The earthquake disaster on the hill side region may be due to this energy concentration.
