Scientists were unsure for decades whether to believe data suggesting that shallow faults near Seattle had ruptured together or in close succession.Now, the University of Arizona-led research of tree rings has confirmed one or more major earthquakes occurred in the region 11 centuries ago this winter.The seismic movement involved at least two of four shallow faults in the
A double earthquake threat? Study finds 2 Seattle-area faults ripped about the same time phys.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from phys.org Daily Mail and Mail on Sunday newspapers.