Registration of infrasound pulses from open-pit explosions
Acoustic (infrasound) signal generated by open-pit explosions can be so strong to be registered by seismic sensors (see figure).
![](sites/default/files/Others/aqexpl_en.gif)
It is easy to check that a signal is infrasonic one by a seismic group. Apparent velocity of such waves computed by time shifts between channels corresponds to sound velocity 0.33 km/sec.
Array data processing software MTR even has a built-in subsystem for acoustic signals determination.
After installation of infrasonic system our sensibility for acoustic signals increased significantly. Using microbarographs we register acoustic signals from all mines of our region.
![](sites/default/files/Infras/aq_explos_map_en.gif)
It is clear that existence of acoustic signal after seismic event is a reliable criterion that the event is of technological origin.