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Io, the innermost of Jupiter's five major moons, is roughly the same size as Earth's moon. When Voyager 1 and 2 sped past Jupiter in 1979, scientists...

Sometimes you just don't know what you're going to find, and when you do find it, you're not quite sure what it is.

Along with the rest of the world, we at the U.S. Geological Survey's Hawaiʻian Volcano Observatory continue to follow the aftermath of the great...

With great sorrow and shock, the world is bearing witness to the horrendous effects of the earthquake and tsunami that occurred in the Indian Ocean...

Several recent Volcano Watch articles have discussed the difficult nature of making specific eruption predictions about Mauna Loa, the largest volcano...

Recently, an important volcanological meeting of minds took place in Pucon, Chile. It was the International Association of Volcanology and Chemistry...

In early December every year, thousands of earth scientists gather in San Francisco to present and discuss their latest findings. This meeting is...

As winter solstice draws near, the seasonal tradition of illuminating this darkest time of year becomes more obvious. Already many homes, shops, and...

What's in a name? In geology, plenty. Some of the biggest controversies erupt over terminology. For example, HVO scientists like to argue over terms...

While breakouts in the coastal area below Pu`u `O`o, attract renewed attention from scientists and visitors alike, seismologists at the U.S...