EARTHQUAKE DETECTING APPARATUS.

摘要

An earthquake sensor comprises a seismoscope (1) equipped with a mercury droplet (2) placed in a recess (4) formed at the center of a vibration surface (3) and with an electrode (6) disposed around mercury (2) and coming into contact with it only at the time of vibration, and signal processing means (11) for processing signal pulses from this seismoscope and identifying an earthquake. Characterizing signal pulses are generated in a shock wave band by optimizing the shape of the recess (4), the amount of mercury (2) and the distance between the mercury (2) and the electrode (6) and vibration other than that of the earthquake will not be detected.