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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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