The moonscape-like nature of the terrain around the volcano's crater is because the sulfuric gases emitted kill off most of the nearby vegetation.
Also, gas emissions from the crater, as well as seismic conditions throughout the vicinity, are closely monitored 24/7.
A ride up to the summit of Mt. Aso
Super cool—a helicopter ride over Mt. Aso's steam-belching crater
Touristas at the summit, right next to the crater, on a foggy day
Japanese news coverage of a minor eruption in 1979
—Mellow Monk
Go to the Mellow Monk tea page
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