This Week In Science

摘要

The Yellowstone caldera is the remnant of three giant eruptions 640,000 years ago, as well as numerous smaller eruptions prior to 70,000 years ago. The region is still very active and experiences earthquakes, heat flow, and ground deformation, as well as hydrothermal activity. Chang et al. (p. 952) present satellite radar and global positioning satellite measurements which show that the caldera underwent a period of accelerated uplift between 2004 and 2006. The highest rate of about 7 centimeters per year is more than three times faster than uplift rates measured since the 1920s. The uplift may reflect ongoing magma recharge and fluid redistribution.