[capitan_refugio]

Off-Earth seismic experiments have been done in the past. I believe there was one on the moon, but possibly Mars, where a spent part of a satellite was sent crashing into the planet/moon. This is from memory. I'm going to have to look it up.

[RightWhale]

That was done on the moon with very little result. It is also going to be done to a comet or asteroid shortly. Smash it and see what happens. On the moon they had hoped to splash up some hydrogen.