A series of shallow earthquakes has the potential to strike the Pacific Northwest of the US with similar devastating force to the San Francisco quake of 1906.
This newfound earthquake threat poses a substantial risk to over 4 million residents in the Pacific Northwest.
It is encompassing major cities like Seattle, Tacoma, and Olympia.
The research harnesses tree ring science and state-of-the-art radiocarbon dating methods to bridging the years 923 C.E. and 924 C.E.
The study revealed that similar shallow faults, located less than 18 miles beneath the surface, ruptured approximately 1,000 years ago.
It is known as the millennial cluster that occurred either simultaneously to produce an estimated 7.8 magnitude quake and devastated parts of the Middle East.