© jimbosjourneys.comMcGregor Lake
Just three weeks after a pair of rare earthquakes rattled windows and bookshelves, two more seismic events were reported in the Flathead Valley and scientists say this
could be an indication that a seismic "swarm" has begun in the area.
On Dec. 1 at 5:40 a.m., a 3.0 magnitude earthquake shook the McGregor Lake area, almost the exact same area impacted by the 4.0 quake on Nov. 11. The epicenter of the earthquake was 3.6 miles beneath the surface. Less than three hours later at 8:13 a.m., a 3.5 magnitude earthquake 5.3 miles below the surface shook the same exact area.
Mike Stickney, director of the Montana Bureau of Mines and Geology's Earthquake Studies Office, said there were a
number of reports from local residents who said they felt the second quake.
Earthquakes are rare but not unheard of in Northwest Montana and Stickney said the series of shakes could indicate that a seismic "swarm" is beginning.
Comment: 4.7 magnitude earthquake strikes near Sedona, Arizona