THE Yellowstone volcano is "likely" to be involved in a series of new "supereruptions" in the future because of its position at the end of a chain of major active volcanoes, USGS scientist Larry Mastin warned.

TERRIFIED tourists were shocked by a man walking on a fuming active Old Faithful geyser of the Yellowstone volcano in the Yellowstone National Park.

The man appeared to urinate on the geyser while a park ranger repeatedly yelled at him to get to safety.