Earthquakes. Supervolcanoes. Calderas. The End of Civilization. Not the usual subject matter of this blog, but I go where the news takes me. I just checked the last data from the University of Utah's seismograph station in Yellowstone. The earthquake swarm seems to have reintenstified a bit over the past 24 hours. During Dec. 27 and 28, there was a swarm of earthquakes under Yellowstone in the 3.0-3.9 range. Activity then dropped off to quakes less than 2.0 on the Richter magnitude scale. But now we are again seeing quakes above 2.0 and even a 3.5 shaker earlier this morning. Again, the University of Utah puts this all in perspective:
The University of Utah Seismograph Stations reports that a notable swarm of earthquakes has been underway since December 26 beneath Yellowstone Lake in Yellowstone National Park, three to six miles south-southeast of Fishing Bridge, Wyoming. This energetic sequence of events was most intense on December 27, when the largest number of events of magnitude 3 and larger occurred. The largest of the earthquakes was a magnitude 3.9 (revised from magnitude 3.8) at 10:15 pm MST on Dec. 27. The sequence has included nine events of magnitude 3 to 3.9 and approximately 24 of magnitude 2 to 3 at the time of this release.
A total of more than 250 events large enough to be located have occurred in this swarm. Reliable depths of the larger events are up to a few miles. Visitors and National Park Service (NPS) employees in the Yellowstone Lake area reported feeling the largest of these earthquakes.
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