QuakeGuard

One of the most common natural phenomena that bring human and economic losses are earthquakes. The main danger of earthquakes lies in their surprise. The large loss of life is usually due to the lack of any product prior notification of when an earthquake.
This application is designed to warn of seismic activity by detecting the "P"-earthquake waves (mainly vertical) with the accelerometer before the destructive "S"-wave (mainly horizontal) to reach your area. This is possible due to different rates of spread of "P" and "S" waves. If the distance from the epicenter of 200 km, the difference between the arrival at "P" and "S"-waves is about 30 seconds which can be invaluable!
To monitor the seismic situation your device must be placed on a horizontal stationary surface and run the application. When you first run the application accelerometer of your device will be calibrated. After completion of the calibration, by pressing the "OFF" mode to transfer the application to control the vertical acceleration of the surface ("ON"), which is located on your device. A running application prevents your device from going to sleep.
Using spectral analysis eliminates false alarms!
The level of sensitivity to vibration can be easily set using two parameters:
* Acceleration Limit (peak acceleration), in units of gravitational acceleration g (the recommended value of 0.04);
* PSD Sum Limit, in units of sq. g (the recommended value of 0.001).
If the preset limits are exceeded, a loud siren sound will wake you up. Siren off automatically after one minute after the earthquake (or force it can be turned off by pressing the "ON", this disables the control regime).
Possible logging suspicious seismic activity (text log files are stored in / QuakeGuard on your device).
The application interface is available in English and Russian.
The application is provided "as is", the author is not liable for the performance.