Takayuki TOSA

A Basic Research on Landslide Alarm System with Underground Sound

Yasuyuki MIYAKI


Before a landslide happens, underground sounds are generated by the change in the ground. So, a vibration sensor catches them, and this research considers whether a landslide can be predicted.

In last year, the sensor was installed on a short steel pipe, and the underground sounds were measured. But the underground sounds couldn't be measured by rainy sounds. In This year, the sensor is directly buried in the ground, and the underground sounds are measured. When the sensor is buried at depth of 60cm, the influences of the rainy sounds are ignored.

When the structure of the ground changes, sounds by cutting the roots are generated. So, it was investigated. The sample data are analyzed with FFT. From the results, these are showed the peak frequency at 80 Hz and 100 Hz. These results can be used to form a new Landslide Alarm System based on the difference between normal sounds and unusual sounds.

As still the research is in primary stage, further studies like learning more about the underground sounds, comparing the sound data between different experimental sites etc. are considered to be required.