Patent ID: 9366770
Filing Date: 2016-06-14
CPC Classification: G01V

Claim Text:
1. An earthquake determination system in which a plurality of observation terminal devices installed in a dispersed manner at random areas and a seismic analysis processor are connected by a communication network, and the seismic analysis processor determines occurrence of an earthquake on the basis of vibration observation information transmitted through the communication network by the observation terminal device which observed vibration at an installed position, characterized in that each observation terminal device includes a seismometer which outputs vibration waveform information at the installed position and a simplified earthquake determination portion which estimates detection of earthquake P waves from the vibration waveform information outputted by the seismometer and transmits estimated P-wave detection information including detection time of the estimated earthquake P waves and installed position information thereof as the vibration observation information to the seismic analysis processor, when the simplified earthquake determination portion estimates detection of the earthquake P waves; the seismic analysis processor includes an earthquake analysis portion which determines occurrence of an earthquake from the received estimated P-wave detection information, when the estimated P-wave detection information is received from a plurality of the observation terminal devices; the earthquake analysis portion acquires a distance D between the observation terminal devices and a time interval δ between detection times from the detection time of the estimated earthquake P waves and installed position information included in each pair of the estimated p-wave detection information regarding at least two pairs of combinations of the observation terminal devices among the plurality of observation terminal devices which transmitted the estimated P-wave detection information; and when a transmission limit distance of local vibration energy is D