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Mount Eniwa
is an active〔Paul Hunt, ''Hiking in Japan: An Adventurer's Guide to the Mountain Trails'', pg. 179〕 volcano located in Shikotsu-Toya National Park in Hokkaidō, Japan. It sits opposite Mount Tarumae and Mount Fuppushi on the shores of Lake Shikotsu, the caldera lake that spawned the volcanoes. Mount Eniwa is the tallest of the three volcanoes.
==Eruptions==
The last eruption occurred around the start of the 18th century (c. 1700 ±30 years). There are no historical records of this, but tephrochronology indicates phreatic explosions with mudflows from crater 3. Two centuries before this eruption (c. 1550 ±75 years), radiocarbon dating indicates a similar eruption from crater 2. Around the same time (c. 1500 ±150 years), radiocarbon dating indicates another eruption, but from crater 1. This eruption included debris avalanches instead of mudflows. The oldest eruption that has been dated is an explosive eruption from the east side of the summit around 100 BCE ± 100 years according to radiocarbon dating. All these events were central vent eruptions with a volcanic explosivity index (VEI) of 2.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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