One of the longest and largest earthquake swarms on record at Yellowstone

As of August 30, some 2,357 earthquakes had been recorded at Yellowstone Supervolcano since the swarm began in June.

This makes  it one of the longest and biggest earthquake swarms ever recorded.

Even so, experts insist that there is nothing to worry about.

Jacob Lowenstern, one of the scientists in charge of the Yellowstone Volcano Observatory, told Newsweek, “Yellowstone has had dozens of these sorts of earthquake swarms in the last 150 years.”

“The volcano alert level remains at green,” said Lowenstern, pointing out that the Observatory would need to see considerably more and bigger earthquakes, ground deformation, steam explosions and changes in gas and heat discharge before raising the alert level.

7 thoughts on “One of the longest and largest earthquake swarms on record at Yellowstone”

  1. What exactly do the earthquakes signal? 4.0 is not that big a temblor when compared to quakes such as Hegben Lake in 1959 (7.3-7.5) or Borah Peak in 183 (6.9–about the same as the Loma Prieta quake of 1989). Just trying to get this all into perspective. Most of the quakes are pretty small. With Yellowstone, it sounds like it could go either way. So, it’s really hard to tell if this means something serious or if the scientists at Yellowstone are right and it’s pretty minor.

  2. Almost 2400 quakes since June works out to more than one per hour. Something is moving down there, or a lot of something. Is stress building up? Or is stress being relieved by the movement?

  3. Yes something is moving down there-magma.Hence the geysers.mudpits,fumaroles etc. When the caldera-which is huge starts swelling-then you might have some concern.Upward movement means magma is filling the chamber and the pressure is rising like a huge boiler. Long Valley caldera in Kalifornia is similar with Mammoth Mountain ski resort on a volcano on the edge of the old caldera.There have been earthquake swarms in the past several decades similar to Yellowstone.By the way I misspelled Kalifornia on purpose.Some might know why.

  4. I’d be a LOT more concerned if there were no earthquakes at all there…small ones mean they are not having a seismic gap, which is much more dangerous than lots of small earthquakes in a seismically active area. And yes, it does relieve pressure!

  5. I saw a news story about a huge number of small earthquakes in eastern Idaho, only a hundred miles more or less from Yellowstone. There are a lot of fairly recent lava flows in eastern Idaho. Things could get interesting.

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