Yellowstone volcano: activity updates
Yellowstone caldera volcano (Wyoming, USA): monthly update - slight increase in earthquake swarms, deflation
vendredi janv. 04, 2013 07:18 | AUTEUR : T
During the month of December 2012, the University of Utah reports 101 earthquakes were located in the Yellowstone National Park region with a notable increase of earthquake swarms.
The largest earthquake was a magnitude 2.6 event on December 15, 2012, at 6:25 AM MST, located about 10 miles north of Pahaska Teepee, WY. Dec. 9 through Dec. 10 a small swarm of 11 events was located 9 miles north northwest of West Yellowstone, MT with magnitudes 0.3 to 2.1. On Dec. 13 a small swarm of 12 quakes was recorded about 13 miles east of Old Faithful, YNP with magnitudes 0.3 to 2.1. Also on Dec. 13 a small swarm of 12 quakes was recorded between Lewis and Shoshone Lakes with magnitudes 1.4 to 2.5. Overall Yellowstone earthquake rates are normal for this monthly reporting period.
Slow subsidence of the caldera, which began in early 2010, continues. Current deformation patterns at Yellowstone are well within historical norms.
(Yellowstone Volcano Observatory / USGS monthly update)
Yellowstone caldera volcano (Wyoming, USA): elevated seismic activity, but within normal activity range
vendredi, nov. 02, 2012
Yellowstone earthquake activity remains at background levels. ... [details]
dimanche, oct. 07, 2012
A small earthquake swarm occurred under the Yellowstone caldera. The quakes are few and very small and no indicator of an impending eruption. It completely falls under what is normal behavior of an active caldera. [details]