"That's just the surface manifestation of the enormous amount of heat that's being released through the system,"

"Volcanologists may or may not be the worst scientists in the world at making predictions, but they are without question the worst in the world at realizing how bad their predictions are." Bill Bryson in A Short History of Nearly Everything

From Yellowstone.net: Although visitors to Yellowstone National Park in the immediate future may never experience such events, some hazardous events are certain to occur in the future. However, Yellowstone Volcanic Observatory scientists are monitoring volcanic activity in the region in an effort to alert the public well in advance of any major volcanic eruptions, to ensure public safety.

From The Associated Press:A park ranger based at the north end of the lake reported feeling nine quakes over a 24-hour period over the weekend, according to park spokeswoman Stacy Vallie. No damage was reported.
"There doesn't seem to be anything to be alarmed about," Vallie said.