View Full Version : Earthquake swarm in Central Idaho

2014-Apr-16, 06:11 PM
Flurry of Earthquakes near Challis Attracts Scientists' Scrutiny (http://magicvalley.com/news/local/more-earthquakes-hit-near-challis/article_d8579282-c4ac-11e3-abbe-001a4bcf887a.html)
Three portable seismographs will be installed in the Challis area in central Idaho to help experts better understand a recent flurry of earthquakes.
The U.S. Geological Survey has recorded a sequence of quakes rumbling the area, the largest of them being a 4.1-magnitude quake on Thursday, a 4.9 quake on Sunday and a 4.4 on Monday.

Smaller quakes have also been recorded, including five on Monday ranging from 2.5 to 3.3 in magnitude. Three of the quakes took place within a 40-minute span starting about 9:12 p.m. Monday.
Hundreds of earthquakes rattle nerves in central Idaho (http://www.rawstory.com/rs/2014/04/16/hundreds-of-earthquake-rattle-nerves-in-central-idaho/)
Hundreds of low-level and medium-sized earthquakes have struck central Idaho since last month, puzzling geologists who wonder whether the ruptures portend a much larger temblor to come or are merely the rumblings of a seismic fault previously thought to be dormant.
Such earthquake swarms typically are associated with the movement of molten rock below ground, which geologists credited for the recent quake cluster at Yellowstone National Park, or they are linked to an active fault, he said on Tuesday.
It's hardly time to book tickets for the reactivation of Craters of the Moon (http://www.nps.gov/crmo/index.htm), but the area around the Snake river lava fields may not be quite as quiescent as the past few hundred years have lead us to believe.

2014-Apr-17, 04:36 PM
The Craters of the Moon is a pretty impressive place. We actually visited it in the same year we went to Hawaii to see the volcanoes there. It was quite impressive how more vegetation had recovered in less than 50 years in Hawaii than in 2000 in Idaho, the difference, of course, being water.

2014-Apr-17, 11:53 PM
Just a minor update on this, the USGS is terming this event as a VT-Swarm, which means it's composed of both Volcanic and Tectonic type quakes. Mixes like this are relatively common, in both currently active and inactive volcanic regions. VT's are usually an indication of Tectonic quakes that trigger a shifting of deep magma, and they are not normally associated with any eruptive type or precursor activity.

2014-Apr-21, 03:46 AM
Craters of the Moon is along the same thin-crust plateau as Yellowstone, and is less than 200 miles due west. There are many hot springs in the general area. We visited Craters of the Moon about a month ago - on one of the nineteen days a year that they get measurable moisture.