Yellowstone volcano hits more than 500 earthquakes in Lake Grizzly swarm

A total of 510 earthquakes occurred in one area of ​​Yellowstone National Park in September – a number nearly double the average.

The quakes occurred near Grizzly Lake in the northwest area of ​​the park, between Norris and Mammoth, as part of an earthquake “swarm” there that began in July, according to the US Geological Survey (USGS).

Since then, there have been nearly 800 earthquakes in total.

All earthquakes in September were small. Across the park, the largest earthquake was of magnitude 3.9. An earthquake of this magnitude may be felt by someone but it rarely causes anything more than minor damage to structures or objects.

A stock photo shows a hot springs area in Yellowstone National Park, Wyoming. Yellowstone is one of the most seismically active regions in the United States, experiencing hundreds of earthquakes annually. Roman Khomlik/Getty Images

Yellowstone National Park is one of the most seismically active areas in the country and is known not only for the hundreds of small earthquakes that occur there every year, but also for its numerous geothermal geysers and hot springs.

It is also home to the massive Yellowstone volcano.

This activity is due to the fact that the park is located above an extensive network of fault lines – cracks between two masses of rock that allow them to move relative to each other. This movement can release huge amounts of energy, which causes earthquakes.

Yellowstone tends to experience earthquakes in swarms due to the movement of volcanic fluids along fractures in underground rock.

Mike Poland, a USGS research physicist and scientist in charge of the Yellowstone Volcano Observatory, told Newsweek that although the recent number of earthquakes near Lake Grizzly was above average – which he said was roughly 150 to 200 Monthly – It is not unusual for swarms to show such sudden activity.

“For several months we have seen between 800 and 1,000 earthquakes,” Poland said. For example, in July 2021, there was a swarm of over 800 earthquakes under Yellowstone Lake over a 10-day period.

“The largest/longest swarm of the past few years occurred in 2017, when over 2,400 earthquakes (maximum M4.4) occurred in the area between Lake Heipgen and the Norris Geyser Basin, the most seismically active area of ​​the park, during to September of that year.

“There is no strong seasonality for these swarms, as they can occur in winter as well, such as February 2018 when a swarm of more than 500 earthquakes occurred in the same general range from Lake Hebegin to the Norris Geyser Basin.

“This area has a lot of pre-existing faults, and when the groundwater interacts with them, earthquakes happen. The area was also stressed by the 1959 M7.3 Lake Heipgen earthquake, so it is more prone to small events anyway. That is what makes it the most active part seismically at Yellowstone”.

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