One of the most common features found at large volcanoes are calderas, formed by the collapse of the land due to eruption. The scale of these features varies a lot depending on if you're on Earth or ...

When a volcano erupts, stuff comes out of the ground. Most of the time, it isn't much stuff (and by "stuff", we're talking lava, ash, volcanic gases in varying proportions). But sometimes it's a lot.

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Last week’s earthquake in western Montana was the strongest earthquake in the region in 60 years. An initial quake set off 10 smaller earthquakes, with people as far west as Seattle and as far north ...

Deposits and scarp from the July 21, 2014 landslide in the Askja caldera, Iceland. Photo by Capture from RUV.is video. Most volcanoes are inherently unstable features. They are constructed of loose ...

The city of Mammoth Lakes sits on the edge of the Long Valley Caldera formed around 700,000 years ago. This caldera is 15 miles in diameter and is North America's second largest. 1. The Long Valley ...