BOISE, Idaho  — More than 40 small earthquakes were recorded in east-central Idaho last week in what experts say is another earthquake swarm in the region.

Officials in the Challis area on Friday reported no damage from the micro-quakes that started Tuesday and have mostly gone unnoticed or unreported in an area with residents accustomed to more vigorous shaking.

But the temblors ranging up to 2.9 magnitude have perked up scientists trying to understand the fault system in the area where a 5.0 magnitude quake struck in January.

Scientists brought in temporary seismometers last year during a previous earthquake swarm and then earlier this year put in a permanent seismometer near Challis.

The swarms are occurring within the Centennial Tectonic Belt extending west from Yellowstone National Park. 

The park is well known as a geologic hotspot, but scientists said that doesn't explain the swarms in east-central Idaho.

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