has anyone heard more about this phenomenon that happend in November?? Strange ripples spread around the world .. no one knows why
While not a geologist, I would guess that they were a subsonic resonance deep in the crust in which the wave was very strong but widely spread -- caused by tectonic motion. The center was along a major fault line. The planet has made audible groaning sounds. As we are able to detect more and more, we should find other aspect of the EM spectrum.