The Volcano Adventure Guide: Excellent information and background for anyone wishing to visit active volcanoes safely and enjoyably. The book presents guidelines to visiting 42 different volcanoes around the world.
Numazawa volcano has a small 1.5 x 2 km wide caldera which formed during a major eruption about 4600 years BP, producing large quantities of dacitic-to-rhyolitic pumice fall and flow deposits. The caldera is filled by a lake.
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