These findings could have implications for seismic preparedness measures in the region. In February, a 7.8-magnitude earthquake shook the Turkey-Syria border, followed by one nearly as large nine hours later. Shallow faults less than 18 miles beneath the surface buckled and ruptured, causing viol
A University of Arizona-led study used tree rings to determine that the Puget Lowlands in western Washington experienced significant earthquakes due to interconnected shallow faults around 1,000 years ago. This reveals potential risks for the region’s current inhabitants and suggests that current hazard models may need revision.In February, a 7.8-magnitude earthquake shook the Turkey-Syria border, followed by one nearly as large nine hours later.
While earthquakes are not new to the Pacific Northwest, the study identified that events on these shallow faults are linked to each other in some way, either by connections underground or by one fault transferring stress to the other.
In 2021, Black trekked into the mountains of the Pacific Northwest to participate in harvesting stumps from trees that had died when the Saddle Mountain Fault impounded a stream that flooded a forest. The lake and the stumps of these drowned trees remain today. To determine an exact calendar year of death, the team built a 1,300-year chronology from living but extremely old trees, which, when matched with the earthquake-killed trees, showed that the dormant season of death was late 923 to early 924.
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