Researchers studied tree rings to pinpoint an earthquake event ~1100 years ago. They believe it reveals multiple faults ruptured at once or back-to-back.
Researchers studied tree rings to reveal multiple faults ruptured at once or back-to-back earthquakes occurred over one thousand years ago.shows a seismic event around 1,100 years ago likely involved faults rupturing together or back-to-back earthquakes in western Washington.
"We knew about the Seattle Fault, the Tacoma Fault, Saddle Mountain, Southern Whidbey Island; the whole range of these fault lines in our area that have the potential for earthquakes," Tobin said."What we have not seen is any evidence of them interacting with each other in this way, linking up to create one larger - up to magnitude 7.8 - earthquake or a series of smaller but still big, damaging earthquakes.
Black and teams on the study harvested stumps from trees that died when the Saddle Mountain Fault impounded a stream that flooded a forest in the Olympics and studied sections of trees that drowned in landslides during a large earthquake on the Seattle Fault.
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