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Triple swarm of earthquakes shakes Yellowstone
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Until recently, Bob Smith had never witnessed two simultaneous earthquake swarms in his 53 years of monitoring seismic activity in and around the Yellowstone Caldera.
Now, Smith, a University of Utah geophysics professor, has seen three swarms at once.
“It’s very remarkable,” Smith said. “How does one swarm relate to another? Can one swarm trigger another and vice versa?”
Because concurrent swarms have never been detected in the past, the answers aren’t in yet, Smith said. The geophysicist said he “wouldn’t doubt” if at least two of the events were related.
Temblors from the three quake swarms mostly hit in three areas: Lewis Lake, the Lower Geyser Basin and the northwest part of Norris Geyser Basin.
The largest earthquake shook the ground near Old Faithful Geyser on Sept. 15.
The epicenter of the magnitude 3.6 quake, the largest in Yellowstone in about a year, was just 6 miles to the north of Old Faithful.
[link to www.komonews.com]
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