MAMMOTH HOT SPRINGS, Wyo. - Three more earthquakes shook an area near Yellowstone National Park early Friday morning.
The three early morning aftershocks came after an initial 4.5-magnitude quake occurred at 6:48 p.m. Thursday. It happened about 8 miles northeast of West Yellowstone. Nine earthquakes followed.
At 2:02 Friday, a 2.8-magnitude earthquake hit the same area. It was followed by a 2.7-magnitude quake at 6:40 a.m. and another one at 7:17 a.m.
The West Yellowstone Police Department says the initial earthquake was felt in the town that borders the park, but there were no reports of damage.
The University of Utah Seismograph Stations said the quake was part of "an energetic sequence" of about 30 earthquakes in the area that began on Monday. Thursday's quake was the largest to occur in Yellowstone since a 4.8-magnitude quake in March 2014.
Earthquakes occur frequently in and around Yellowstone.
In 1959, the Hebgen Lake earthquake near Yellowstone in Montana killed 28 people.