The November 9, 2007 issue of Science Magazine features an article,
Accelerated uplift and magmatic intrusion of the Yellowstone Caldera,
2004 to 2006, by YVO scientists from the University of Utah and USGS.
The lead author, Wu-Lung Chang is a Post-doctoral associate with Robert
B. Smith, YVO Coordinating Scientist at the University of Utah. Chang
specializes in use of the Global Positioning System (GPS) to measure
very small movements of the Earth's crust. Using GPS and another
satellite-based technique (InSAR), the authors find that parts of the
Yellowstone Caldera rose as much as 7 cm (~3") per year during the
period 2004-2006. The uplift is most noticeable at the White Lake GPS
station, as has been discussed in our monthly YVO updates during the
past year. As of late October 2007, the total uplift since 2004 at that
location is about 17 cm. Chang and his colleagues credit the relatively
rapid rise to recharge of magma into the giant magma chamber that
underlies the Yellowstone Caldera. They also used numerical modeling to
infer that the magma intruded about 10 km (6 miles) beneath the surface.