Seismic Weaponry - Referenced in public statement in 1997 by SecDef William Cohen

Here's a factual discussion piece from 1997. I had been out of the Navy for two years and remember hearing what I discarded as rumors of Soviet research into seismic weaponry. SecDef Cohen addresses it in a Q&A session DefenseLINK News: Secretary Cohen With Senators Nunn and Lugar - April 28, 1997:

"Others are engaging even in an eco-type of terrorism whereby they can alter the climate, set off earthquakes, volcanoes remotely through the use of electromagnetic waves. So there are plenty of ingenious minds out there that are at work finding ways in which they can wreak terror upon other nations. It's real, and that's the reason why we have to intensify our efforts, and that's why this is so important. "