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The ground around an active volcano swells, deflates, or shifts as magma moves in and out of the volcano's underground plumbing system. The...

Hawaii is a land of rugged beauty and untamed natural forces swathed in a beguiling gentleness that is unmatched anywhere else on Earth.
 

Hawaii is seismically very active. During a typical month, there are invariably several earthquakes that are large enough to be felt. This past month...

Maps showing volcanic hazard zones for the Big Island were first prepared in 1974 by the U.S. Geological Survey.

Many of the islands that dot the center of the Pacific Ocean are made up of active, dormant, or extinct volcanoes, whose geologic histories are...

April 10th marks the aniversary of the 1926 eruption of Mauna Loa Volcano. The eruption was preceded by several widely felt earthquakes about one hour...

The Hawaiian Volcano Observatory is located on the northwest rim of Kīlauea caldera adjacent to the Jagger Museum. Because of its location within...

The U.S. Geological Survey maintains a network of more than 50 seismic stations on Hawaii Island. The instruments and their distribution were...

A few weeks ago, several members of the Hawaiian Volcano Observatory staff presented information about volcanic hazards on Hawaii to the Hawaiian...

Friday, March 25, marked the tenth anniversary of the last eruption of Mauna Loa Volcano. The 1984 eruption followed a nine-year period of quiescence...