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Yellowstone volcano was hit by the largest earthquake in 5 years
The area around Yellowstone volcano was hit by a 4.2-magnitude earthquake – the largest to hit the area since 2017, when a 4.5-magnitude quake struck during a massive earthquake swarm in the national park.
A statement from the University of Utah, which monitors seismic activity in the Yellowstone area, said the earthquake struck on May 11 at 8:35 a.m. local time. The epicenter was 23 miles northeast of the eastern entrance to Yellowstone National Park.
“Five earthquakes of magnitude 3.0 or greater have occurred within 16 miles of the epicenter of this event since 1962,” the statement said. “The largest of these events was 4.2 on the Richter scale on March 25, 2008, 20 miles [northeast] fishing bridge, [Wyoming]. “
Stock photo showing spring at Yellowstone National Park. The area was hit by a 4.2-magnitude earthquake on May 11. Getty Images
The Yellowstone region is one of the most seismically active regions in the United States, with earthquakes being recorded in the region all the time. In April, the area experienced 141 earthquakes, the largest of which was a 2.5-magnitude event on April 30.
An annual report published by the US Geological Survey (USGS) shows that the total seismic activity in the park in 2021 included 2,773 earthquakes – more than 1,000 earthquakes that hit the park in 2020.
At the time of writing this summary, 42 people reported feeling a 4.2-magnitude earthquake. A statement from the Yellowstone Volcano Observatory (YVO) said most reports described the shaking as “weak” or “light”. More than 30 earthquakes with a magnitude of 4.0 or higher have struck Yellowstone since 1973, YVO said.
Today’s earthquake, which occurred at a depth of 14 kilometers (8.7 miles), is the largest to occur in Yellowstone National Park since the June 15, 2017 M4.5 event (part of a long-lived swarm of small earthquakes in the area between Lake Hepgen and the Norris Geyser Basin). , northwest of Yellowstone, [Montana]The statement said.
2017 Yellowstone earthquake swarm
The 2017 earthquake swarm in Yellowstone had about 2,500 tremors recorded over a three-month period. It was one of the largest swarms of earthquakes ever recorded in the park. The largest recorded earthquake swarm occurred in 1985, when more than 3,000 earthquakes struck the region in three months.
In 2018, David Shelley, a USGS seismologist, examined the cause of the swarm, saying it appeared to be driven by water moving through small cracks in the Earth’s interior.
“Because this water is under great pressure in the deep crust where it is released, it tends to migrate upward and sometimes laterally,” he wrote in a blog. “When it interacts with cooler, brittle rocks that are under stress from tectonic and volcanic processes, this water may trigger earthquakes. In fact, the earthquakes themselves may allow fluid to move more efficiently, through faults in the rock.”
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