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Volcano Photos

Agrigan Volcano, Northern Mariana Islands

Agrigan Volcano, Northern Mariana Islands, Volcano photo


Agrigan Volcano, Northern Mariana Islands

Clouds drape the flat-topped summit of Agrigan, the highest of the Marianas arc volcanoes, in this view from the south.

The elliptical island is 8 km long; its 965-m-high summit is the top of a massive 4000-m-high submarine volcano, the second largest in the Mariana Islands.

An elongated summit caldera is 1 x 2 km wide, 500 m deep, and is breached to the NW.

The vegetated flanks of the volcano consist almost entirely of pyroclastic deposits that are more than 100 m thick on the SW flank.

The highest of the Marianas arc volcanoes, Agrigan contains a 500-m-deep, flat-floored caldera.

The elliptical island is 8 km long; its 965-m-high summit is the top of a massive 4000-m-high submarine volcano, the second largest in the Marianas Islands.

Deep radial valley dissect the flanks of the thickly vegetated stratovolcano.

The elongated caldera is 1 x 2 km wide and is breached to the NW, from where a prominent lava flow extends to the coast and forms a lava delta.

The caldera floor is surfaced by fresh-looking lava flows and also contains two cones that may have formed during the volcano's only historical eruption in 1917.

This eruption deposited large blocks and 3 m of ash and lapilli on a village on the SE coast, prompting its evacuation.

PHOTO SOURCE: Dick Moore, 1990 (U.S. Geological Survey).


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