America’s Volcanoes

The current monthly update for Yellowstone from YVO:

Wednesday, August 1, 2007 10:37 MDT
Volcano Alert Level: NORMAL
Aviation Color Code: GREEN

During the month of July 2007, 80 earthquakes were located in the Yellowstone Region. The largest of these shocks was a magnitude 2.2 on July 26, 2007 at 9:52 AM MDT, located about 9 miles north northwest of West Yellowstone, Montana. No swarms occured durring this period.

Earthquake activity in the Yellowstone region is at relatively low background levels.

Ground Deformation Summary: Through July 2007, continuous GPS data show that most of the Yellowstone caldera continued moving upward at similar to slightly lower rates as the past year. The maximum measured ground uplift over the past 34 months is ~15 cm at the White Lake GPS station. An example can be found at: [here]

The general uplift of the Yellowstone caldera is scientifically interesting and will continue to be monitored closely by YVO staff.

An article on another recent uplift episode at Yellowstone and discussion of long-term ground deformation at Yellowstone and elsewhere can be found at: http://volcanoes.usgs.gov/yvo/2006/uplift.html

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