Mount Aso has the world's largest active volcanic crater. In which country is it situated?
Aso Caldera and 270,000 years ago. The largest of these was the fourth, which reached as far as nearby Yamaguchi Prefecture 160 kilometers away. The fourth eruption left a massive pyroclastic plateau which is what remains even today. In 1985 it was discovered that volcanic ash from the fourth eruption covered much of the Japanese islands. The extent of the fourth eruption is estimate to be approximately 200 km3. Aso caldera has often been called the largest in the world, but actually Indonesia's Danau Toba, measuring 100 km by 30 km, is the world's largest. Furthermore, in Japan, Kussharo caldera, which measures
Mount Aso Mount Aso The central cone group of Aso consists of five peaks: Mt. Neko, Mt. Taka, Mt. Naka (also called Nakadake or Naka-Dake), Mt. Eboshi, and Mt. Kishima. The highest point is the summit of Mt. Taka, at 1592 m above sea level. The crater of Mt. Naka, the west side of which is accessible by road, contains an active volcano which continuously emits smoke and has occasional eruptions. Only the northernmost crater (the first crater) has been active for the last 70 years—1974, 1979, 1984–1985, 1989–1991, 2009, 2011, 2015 and 2016. The present Aso caldera formed as a result