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Volcano Photos

Unzen Volcano, Japan

Unzen Volcano, Japan, Volcano photo


Unzen Volcano, Japan

This closeup view on May 20, 1991, shows the first lava extrusion of the 1990-95 eruption of Unzen volcano in Japan.

The dome was extruded in the Jigoku-ato crater, which was formed by an explosion on the first day of the eruption, November 17, 1990.

By May 23 the dome reached a height of 44 m and had a diameter of 110 m.

It then began spilling over the east crater rim (upper right).

Periodic collapse of the oversteepend front of the dome produced pyroclastic flows that traveled progressively farther down the Mizunashi valley.

PHOTO SOURCE: Shimbara Earthquake and Volcano Observatory 1991, courtesy of the Global Volcanism Program, Smithsonian National Museum of Natural History, used with permission.


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