| 摘要 |
The present invention reduces the power consumption of a seismic sensor. This seismic sensor operates in a power saving mode and a measuring mode, which has a power consumption greater than that of the power saving mode. The seismic sensor is provided with: a measuring unit that measures acceleration; a filtering unit that, if the acceleration measured by the measuring unit exceeds a predetermined threshold, shifts the mode from the power saving mode to the measuring mode, and subjects the measured acceleration to filtering; an earthquake determination unit that determines whether an earthquake has occurred on the basis of the acceleration subjected to the filtering; and an indicator calculation unit that, if the earthquake determination unit has determined that an earthquake has occurred, calculates an indicator value indicating the magnitude of the earthquake, wherein the mode is shifted from the measuring mode to the power saving mode if the earthquake determination unit determines that no earthquake has occurred. |
