>THATS ABOVE GROUND
Sonic booms and thunder register this way. In fact, the existence of several top secret experimental aircraft was first documented by seismographic evidence. The SR-71, Aurora, and others were discovered this way.
>THATS ABOVE GROUND
Sonic booms and thunder register this way. In fact, the existence of several top secret experimental aircraft was first documented by seismographic evidence. The SR-71, Aurora, and others were discovered this way.