Kozu Shima Volcano, Japan
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Kozu Shima Volcano, Japan
The cultivated floor of an explosion crater (left) and a flat-topped lava dome (right) are part of Kozu-shima volcano in the northern Izu Islands.
The small 4 x 6 km island is formed by a cluster of rhyolitic lava domes and associated pyroclastic deposits.
The youngest and largest dome, 574-m-high Tenjo-yama, occupies the central portion of the island.
Most of the older domes flank Tenjo-yama on the north.
Only two historical eruptions, from the 9th century, are known.
A cluster of rhyolitic lava domes and associated pyroclastic deposits form the small 4 x 6 km island of Kozu-shima in the northern Izu Islands.
Kozu-shima lies along the Zenisu Ridge, one of several en echelon ridges oriented NE-SW, transverse to the trend of the northern Izu arc.
The youngest and largest of the 18 lava domes, 574-m-high Tenjo-yama, occupies the central portion of the island.
Most of the older domes, some of which are Holocene in age, flank Tenjo-yama to the north, although late-Pleistocene domes are also found at the southern end of the island.
Only two possible historical eruptions, from the 9th century, are known.
A lava flow may have reached the sea during an eruption in 832 AD.
Tenjo-san lava dome was formed during a major eruption in 838 AD that also produced pyroclastic flows and surges.
Earthquake swarms took place at Kozu-shima during the 20th century.
PHOTO SOURCE: Ichio Moriya (Kanazawa University), courtesy of the Global Volcanism Program, Smithsonian National Museum of Natural History, used with permission.
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