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Magnitude 3.6 Earthquake Strikes Near Black Eagle, First Widely Felt in Months

USGS said the quake was felt as far as 25 miles away, and no injuries or serious damage were reported.

  • On Friday, Sept 18, a 3.6 magnitude earthquake struck near Black Eagle, Montana, originating at a depth of about 17 miles, according to the United States Geological Survey.
  • The Montana Bureau of Mines and Technology suggests the quake was likely an aftershock of the 4.2 magnitude event from Jan 29, with no evidence that earthquake activity in the region is escalating.
  • More than 150 responses were submitted through the USGS "Did You Feel It?" system reporting the event as "weak" from nearly 25 miles away; NorthWestern Energy confirmed the subsequent power outage was unrelated to the quake.
  • Researchers installed two new seismometers in the area to improve data collection following earlier seismic activity, with research seismologist Andres Felipe Castro confirming the monitoring system detected the event.
  • The bureau is seeking residents interested in hosting additional seismometers to help expand its monitoring network around Great Falls, as experts note the probability of another felt event never drops to zero.
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Magnitude 3.6 earthquake strikes near Black Eagle, first widely felt in months

A magnitude 3.6 earthquake was recorded near Black Eagle on Friday, Sept. 18, marking the first earthquake in the Great Falls area in several months which was large enough to be widely felt.

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KPAX broke the news on Friday, September 18, 2026.
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