Another mild earthquake hit the Lincoln area early on Monday.
The U.S. Geological Survey says that a magnitude 4.0 quake hit eight miles southeast of Lincoln just before 3 a.m.
It was located about 7.2 miles underground.
There were no reports of major damage or injuries.
Several people reported
The quake was felt in Lincoln, Helena, and Great Falls and even as far away as Bozeman and Whitefish.
A magnitude 5.8 earthquake shook the Lincoln area on July 6th and has been followed by several strong aftershocks.
(THURSDAY, JULY 6) A 5.8 magnitude earthquake shook parts of Montana early Thursday.
The U.S. Geological Survey says that quake was centered about 5.5 miles southeast of Lincoln at a depth of about 2.6 miles.
The first shake occurred at 12:30 a.m. and lasted for at least 30 seconds, beginning with a slow tremor and then building in intensity.
It was followed by at least five smaller aftershocks, ranging from 3.8 to 4.9 in magnitude.
The intensity of the main quake is classified as "VI" on the magnitude scale, indicating light damage and strong shaking.
People from across Montana reported feeling the quake, many of them saying that it woke them up.
In addition to scores of reports from in and around Lincoln, reports have been received from Helena, Great Falls, Lewistown, Havre, Kalispell, Missoula, Butte, and beyond. The quake was felt as far away as Seattle, Washington, and Calgary, Canada.
Thousands of people have used the "Did You Feel It?" reporting page on the USGS website.
There have been no reports of injuries or major structural damage, but we have received numerous reports of items shaken off of shelves and counters.
The earthquake appears to be the largest to hit Montana since a 5.6 struck outside of Dillon in July 2005.
We will keep you updated as we get more information.
MONTANA SEISMIC BACKGROUND: According to the USGS, Montana is one of the most seismically-active states in the country, although the vast majority of recorded earthquakes are very small, causing no damage and rarely noticed by people.
Montana is located within the Intermountain Seismic Belt, an active earthquake region stretching along the Rocky Mountains. It is the fourth-most seismically active state, although the vast majority of earthquakes in Montana are too small to be felt.
But there are exceptions. About 90 years ago, a large earthquake hit southwest Montana. The quake damaged a school house in Three Forks, twisted railroad tracks along the Missouri River, and damaged a jail in White Sulphur Springs.
Ten years after that another big quake hit Helena, killing two people and causing millions of dollars in damage. It damaged churches, collapsed walls right out of homes, and hit commercial and government buildings as well.
There was also the deadly 1959 earthquake that created "Quake Lake" and shook West Yellowstone. It claimed the lives of 28 people and did the equivalent of $89 million in damage.