Tintina Fault

The Tintina Fault is a large right-lateral strike-slip fault in western North America, extending from Flathead Lake, Montana to the centre of the U.S. state of Alaska. It represents the Yukon continuum between the Rocky [Mountain Trench] in the northern contiguous [United States] and the Kaltag Fault in Alaska.
Unlike the Denali Fault, which ruptured a portion of its central segment during the 2002 Denali earthquake, the Tintina Fault is considered inactive. Despite this classification, researchers noted a magnitude 5.3 right-lateral event in 1972 and a relatively young scarp with a maximum offset of. A 2025 study suggests that stress may be developing along the Tintina Fault which could produce a magnitude 7.5 or higher earthquake.