“This knowledge has important implications for how we monitor volcanic systems, especially when interpreting geophysical data, since it redefines what we might consider an active or eruptible magma reservoir.”
In the case of Yellowstone volcano, geologists have found the Huckleberry Ridge eruption—the biggest of Yellowstone’s three major blasts – came from four separate melt pockets.
The eruption, which went off about 2.1 million years ago, spewed about 600 cubic miles (2,500 cubic kilometres) of volcanic material.
Thankfully, recent studies of Yellowstone volcano’s magma reservoirs do not reveal any evidence of substantial melt pockets beneath the supervolcano.
The USGS said: “In fact, geophysical imaging shows that the mush zone consists of only about five to 15 percent melt, which indicates that a large eruption is not likely to happen anytime soon.”