This happened before, i had forgotten about it. But it was posted on some forum, and they could track the seismic waves as they traveled from the eastern US to the western US - and they were exceptionally fast... but the interesting thing of when that particular event happened was that the speculation was it was the detection of secret underground high-speed transports, between DUMBS...

Other than it being an interesting fanciful thought to imagine if such a thing could be, i didnt think much of it.

But this is interesting in that the waves were also tracable from seismometer to seismometer...

Ill see if i can find it.