Uhh…Is it just me, or is this way scarier than the asteroid stuff that gets so much press?
By Ian Gurney
“September 11, 2003?Part of America’s Yellowstone National Park was closed to visitors on July 23 this year and remains closed today due to high ground temperatures and increased thermal activity in the park. National Park Superintendent Suzanne Lewis said that “A portion of the Norris Geyser Basin on the west side of the park has been closed.” 
On August 7, the United States Geological Survey (USGS) reported that scientists were planning to set up a temporary network of seismographs, Global Positioning System receivers and thermometers to monitor increasing hydrothermal activity in the Norris Geyser Basin and gauge the risk of a hydrothermal explosion. ”