Spokane area earthquakes??

Today's Spokesman-Review (Thursday, 25 Oct 2007) carried this article: "Tiny quakes shaking Wandermere area." Apparently, Spokane and northeast Washington have undergone a series of minor earthquakes in the past two months....but most, if not all, were too small to be felt. Such was not the case back in June 2001 when a rattler of 3.7 size woke up Spokane residents at 7:15am. If you'd like to know more about earthquakes in the Spokane area, watch for our Eastern Washington Genealogical Society's Bulletin, next issue. Made me think.......do earthquakes happen pretty much everywhere? How did earthquakes affect our ancestors' lives?? Have they affected yours??