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Entries in Montana earthquakes (11)


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. 


Sizable quake shakes Northwest Montana

USGS map(THOMPSON FALLS)- Tuesday's earthquake that hit Northwest Montana was one of the strongest in the western half of the state in several years. 

USGS reports the quake which struck around 3:30 was centered northeast of Thompson Falls and registered 4.0 magnitude. The quake was also fairly shallow, so it was felt over a widespread area. People in the Lower Clark Fork Valley reported feeling the quake, with additional reports spread all through Mineral and Sanders counties. 

By comparison, most of the quakes in Western Montana in the past three or four years have usually been closer to 3.0

There were no reports of any damage. 


Weekend quake centered near Lincoln

USGS map shows area where quake was most likely felt(BUTTE)- Seismologists say a small earthquake that hit West Central Montana Saturday night was centered just outside of Lincoln. 

USGS reports the quake was a 3.6 magnitude and hit around 10:42 Saturday evening. That makes it one of the strongest quakes in Western Montana in several months. 

The quake's epicenter was 9-miles outside Lincoln, or 32-miles west northwest of Helena. The earthquake was fairly deep, at just over 10-miles below the Earth's surface, so that limited the amount of area where people might have felt the quake. Maps show it would have probably been noticed most in the lightly populated areas immediately north and west of Lincoln. 



Another small quake shakes NW Montana

USGS map shows extent of quake's projected "shake" (LIBBY)- Another small earthquake shakes Northwest Montana, the second time in less than a month that the Libby area has felt the earth move.

The US Geological Survey reports the magnitude 3.5 quake hit just before 7 o'clock Tuesday evening. Preliminary indications were that the quake's epicenter was 27-miles southeast of Libby, 39-miles west of Kalispell. That would put it close to Happy's Inn and not far from the Thompson Lakes. 

The quake was quite shallow, just over 1-mile below the surface. 

That puts it in the same general area as a 2.5 quake that happened on May 3rd. 


Moderate quake felt in Western Montana 

USGS map(LINCOLN)- The U.S. Geologicial Survey says a small quake that shook the earth near Lincoln this morning registered a magnitude of 3.5.

The Montana Bureau of Mines and Geology recorded the quake at 8:41 this morning 4-miles east southeast of Lincoln. That puts the epicenter 35-miles northwest of Helena in Lewis and Clark County. 

The quake was at moderate depth of 9-point-9 miles beneath the surface. 

Geologists are still checking into the quake but say it may have been felt around Helena and as far west as Seeley Lake.