ADVANCE FOR THE WEEKEND OF SEPT. 23-24 AND THEREAFTER - In a Sept. 11, 2017 photo, geologist Jeff Lonn points to a "scarp" where an earthquake separated land along the lower east face of the Bitterroots. A mapping method known as LIDAR that was being used to look at floodplains in the Bitterroot Valley turned up when two Montana Bureau of Mines and Geology experts believe is a new fault scarp in the Bitterroot Valley. (Eve Byron/Ravalli Republic via AP)
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