Seismic sensor, earthquake detection method, and earthquake detection program

An earthquake detection method by using a seismic sensor comprising:

• detecting vibration and measuring an acceleration of the vibration by an acceleration measurement unit of the seismic sensor;
• generating an acceleration waveform indicating a relation between an elapsed time and the acceleration measured in the acceleration measurement unit by an acceleration waveform generation unit of the seismic sensor;
• sensing a frequency of the acceleration waveform generated in the acceleration waveform generation unit by a zero-crossing method by a frequency sensing unit of the seismic sensor;
• and
• determining whether or not there is an earthquake on the basis of the frequency sensed in the frequency sensing unit by an earthquake determination unit of the seismic sensor,
• wherein in the determination, the acceleration waveform is excluded from the determining of whether or not the earthquake has occurred when the frequency of the acceleration waveform sensed by a zero-crossing method is at least a specific value and a period fluctuation of the acceleration waveform is no more than a specific value, and
• wherein in the determination, the acceleration waveform is excluded from the determining of whether or not the earthquake has occurred when an amplitude of the acceleration waveform is at least a specific value and the frequency sensed by a peak method is at least a specific value.

An earthquake detection program for causing a computer to execute an earthquake detection method by using a seismic sensor comprising:

• detecting vibration and measuring an acceleration of the vibration by an acceleration measurement unit of the seismic sensor;
• generating an acceleration waveform indicating a relation between an elapsed time and the acceleration measured in the acceleration measurement unit by an acceleration waveform generation unit of the seismic sensor;
• sensing the frequency of the acceleration waveform generated in the acceleration waveform generation unit by a zero-crossing method by a frequency sensing unit of the seismic sensor;
• and
• determining whether or not there is an earthquake on the basis of the frequency sensed in the frequency sensing unit by an earthquake determination unit of the seismic sensor, wherein
• in the determining, the acceleration waveform is excluded from the determining of whether or not the earthquake has occurred when the frequency of the acceleration waveform sensed by a zero-crossing method is at least a specific value and a period fluctuation of the acceleration waveform is no more than a specific value, and
• in the determining, the acceleration waveform is excluded from the determining of whether or not the earthquake has occurred when an amplitude of the acceleration waveform is at least a specific value and the frequency sensed by a peak method is at least a specific value.