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Entries in Montana earthquakes (15)


A weekend for quakes in Western Montana

(SOMERS)- It was quite the weekend for earthquakes in Western Montana. The U-S Geological Survey says a pair of small quakes hit at the north end of Flathead Lake on Sunday, with one measuring 2.7 magnitude that hit just before noon. 

Then a few minutes later at 3-point-0. Both of the quakes were centered around Somers, with some people reporting they heard a rumble and felt some shaking. Normally a quake of 2.5 to 3 magnitude is about the point where people noticed an earthquake on the surface. 

And that fault near Lincoln continues to be active, with another small quake of 1.8 magnitude on Sunday, the fourth quake in that area this past week. 


Sizable quake west of Yellowstone 

(WEST YELLOWSTONE)- A sizable quake rattled the mountains west of Yellowstone Park this morning, registering a 4.3 magnitude. 

The U.S. Geological Survey says the quake hit at 6:14 Monday morning with the epicenter about 32-miles west of West Yellowstone. That would put the quake's location north of the Continental Divide, in the Centennial Valley. 

That area is sparsely populated, and even an hour after the quake only a couple of people had reported feeling the quake to U.S.G.S.

The region on the west side of Yellowstone frequently has several small quakes per month, but Monday's quake was larger than usual.


Weekend quake near Lincoln largest in years

USGS data- map from (BUTTE)- A weekend quake that rattled the Upper Blackfoot Valley was the largest to hit Western Montana in a couple of years, and among the largest to ever be recorded in recent decades. 

The U.S. Geological Survey says the quake hit near Lincoln on Saturday and registered 4.3 magnitude. People from as far away as Helena reported feeling the quake. 

According to USGS records, it was the largest quake in Montana since a 4.8 magnitude quake was reported near Bozeman 2-years ago. And it was larger than several of the recent quakes near Helena, including a 4.1 magnitude quake which hit 16-years ago. 

The quake is on par with several that have struck Western Montana in recent decades, although many of those were 2-to-3 decades ago. Butte still hold the mark for one of the strongest quakes in recent years, a 5.6 magnitude quake which hit near the Mile High City 11-years ago. 


More small quakes rattle Central Montana

USGS graphic (HELENA)- Two more quakes rattled Central Montana overnight, the latest in a series of quakes that have been recorded across the region this fall. 

The U.S. Geological Survey recorded the two quakes outside Helena in the Clancy area Sunday evening. 

The first quake, which registered a 2.3 magnitude was recorded at 6:12 Sunday evening. Then a stronger quake happened at 9:30, measuring 3.4 magnitude. That second quake was large enough for people to feel the shake, with people in and around the Helena Valley, and even as far west as Missoula reporting they felt the quake. 

There have been five small quakes in the Helena area in the past week alone.


A pair of quakes rattle the Lower Clark Fork

(SANDPOINT, ID)- Not just one, but two sizable quakes rattled the Lower Clark Valley late Thursday night, with the shaking being felt over a wide area of Northern Idaho and far Western Montana.  

The U.S. Geological Survey recorded the first shaking at 7:32 PDT in the evening, with the epicenter of the 4.1 magnitude earthquake just 13-miles southeast of Sandpoint, just east of Lake Oreille. That was enough to be felt as far east as Noxon and Trout Creek in Montana, where residents reported feeling their houses shake with what felt like "thunder", rattling glasses and furniture.  

But the shaking didn't stop there.

Three hours later a second, larger quake was recorded in the same vicinity. 

USGS reports the second quake was 4.2 magnitude with an epicenter 9-miles east of Ponderay, Idaho that hit just before 11 p.m. local time. 

However that wasn't the end of the shaking. A third quake, actually more of an aftershock, measuring 3.3 magnitude was recorded around 1:30 Friday morning, with an epicenter 8-miles east of Sandpoint. 

Bonner County officials reported no damage was the quakes although some downed trees were noticed near the epicenter of the first quake.  

Although a magnitude 4 earthquake is still considered to be "light", the two quakes were fairly shallow, just 5-kilometers below the surface, making them more noticeable to residents in the area.