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How big is an eruption? This is a short question with a long answer. Volcanologists, like other people, judge the size of something by comparing it to...

Pu`u `O`o's crater and rootless shield at 2247 feet

From time to time, we get calls from people who are writing about Kilauea, hoping to confirm the idea that Kilauea is the most active volcano on Earth...

A heightened awareness of earthquakes usually follows large and destructive ones, like those occurring in Turkey and El Salvador in 1999 and 2001...

A number of hills, elongate in an upslope-downslope (mauka-makai) direction, rise 30-425 m (100-1,400 feet) above the surrounding gentle slopes of...