An emergency earthquake warning system using mobile terminals with a built-in accelerometer

In this paper, we study an emergency earthquake warning system using mobile terminals with a built-in accelerometer. First, the earthquake warning system that uses mobile terminals such as smart phones as seismographs is proposed. When an earthquake occurs, the mobile terminals detect seismic wave using a built-in accelerometer. If the value of acceleration exceeds the threshold value, information of acceleration is transmitted to a server on each region. The server manages information that has been sent by mobile terminals, and presumes the seismic intensity and the hypocenter, and sends warning messages to user terminals around the server. Then we evaluate the server of the proposed system, and show the sending and receiving ability of warning messages.