An underground hydrothermal explosion at Yellowstone National Park sent visitors running for their lives Tuesday morning as a massive black mushroom cloud of steam and debris rose hundreds of feet in ...

Steamboat is the world's tallest active geyser, but unlike Old Faithful, its eruptions are completely unpredictable. Now, a new analysis suggests that at least one recent Steamboat eruption got ...

RENO, Nev. (News 4 & Fox 11) — Not since the days of Mark Twain has there been anything like what people witnessed in the Steamboat area of south Reno this month — a geyser shooting scalding water 30 ...

A June 17 Facebook post (direct link, archive link) shows lava and a large cloud of smoke erupting from a ridge. "Breaking: Yellowstone Lava Geyser," reads the post's caption. "For the first time in ...