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 violent focused quakes that leveled thousands of buildings and killed tens of thousands.
and policies, don't currently reflect this possibility—but should, said paper first author Bryan Black, an associate professor of dendrochronology in the UArizona Laboratory for Tree-Ring Research.Scientists have been uncovering shallow faults in the region since the 1960s, when the Seattle Fault was first discovered, followed by the Saddle Mountain Fault, which runs along the eastern foothills of the Olympic Mountains, and the Tacoma and Olympia faults.
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. Black and his team also had sections sourced from nearby trees killed around the same time during a rock avalanche that impounded a stream that flooded a nearby streambed. They also acquired sections from trees collected more than 30 years ago that had drowned in landslides into Lake Washington and Lake Sammamish during a large earthquake on the Seattle Fault.
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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