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The basic strategy in monitoring a volcano has not changed much since 1912 when Thomas A. Jaggar founded HVO. He recognized the importance of...

On the night of June 1, 1950, after many residents of Ho`okena-mauka village in South Kona had already gone to bed, Mauna Loa began to erupt. Soon the...

A pair of devastating eruptions in the Caribbean 99 years ago this week shook the world and, as fate would have it, led indirectly to the founding of...

In last week's article we mentioned that April is tsunami awareness month in Hawai`i and earthquakeawareness month in California.

Early Monday morning, residents of the northern half of the island were awakened by a magnitude-3.9 earthquake. This was a gentle reminder that we...

Here's a riddle for you—which large land holder on the Big Island condemns property at will, holds liens on large parts of the island, and doesn't pay...

Late on March 30, a visiting geology student from Oregon fell about 12 m (40 feet) into a crack in the ground between Crater Rim Drive and the rim of...

Nearly on the other side of the planet, the Big Island has a sister, older by at least a couple of million years: Reunion Island, built in the same...

The summits of volcanoes are part of an ever-changing landscape. The summit of Mauna Loa has undergone considerable change in the short period since...

The U.S. Geological Survey's Hawaiian Volcano Observatory currently operates a network of 65 seismic stations. Signals from each station, including...