Earthquakes? It had been happening on Earth since billions of years ago....
Yeah, yeah ...some geological epochs are more active than others. However geological times goes by millions and millions of years, and as I read somewhere else earthquakes are necessary (specially near tectonic boundaries)...if not Earth would become flat with no mountains at all.
As for sign of the times, the huge ones in San Andreas or Cascadia could happen in a couple of minutes or in a 300 years span or more, who knows?