Usu


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Usu

 

an active volcano in southeastern Hokkaido, Japan. Usu has an elevation of 609 m (725 m according to some sources). The crater of the volcano is 2–3 km in diameter and contains two lava domes. Since 1663 there have been six major eruptions, which were accompanied by a considerable vertical displacement of the volcano and the adjacent territory for a short period of time. During the last eruption, between 1943 and 1945, the volcano’s summit was raised 110 m.

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Usu's northwestern foot, where eruptions have occurred since March 31, the amount of volcanic gas measured in August 1998 was more than 10 times that from other parts of the volcano, except for craters, according to the researchers.
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