About Kirishima Geopark

The development of the Kirishima Mountains through many eruptions

On the north side of the Kirishima Mountains lies the Kobayashi caldera formed about 520,000 years ago and the Kakuto Caldera formed about 340,000 years ago. The volcanic activity of the Kirishima Mountains, on the southern edge of these calderas, is on the border of geologically old and new terrain, and most of the volcanoes we see today were formed in the more recent age.

340,000 years ago

A large eruption occurred in the region including the current city of Ebino and town of Yusui.
In the surrounding area, large deposits from pyroclastic flows formed the Kakuto Caldera.


Using old volcanoes such as Mt. Kurinodake as a foundation, volcanoes such as Mt. Shiratori, Lake Onamiike, and Mt. Hinamoridake were active.


Approx. 30,000 years ago

The large eruption that created the shirasu plateau (eruption of the Aira Caldera) deposited a large amount of shirasu across all of Kirishima. Sakurajima became an active volcano after this.


The volcanoes of Mt. Iimori, Mt. Koshikidake, and Mt. Karakunidake were active.


Mt. Karakunidake had a large eruption and created its current form. To the southeast, the Mt. Kotakachiho began activity.


7,300 years ago

Volcanic ash from the eruption of the Kikai Caldera was deposited around the Kirishima Mountains.


After Mt. Takachihonomine was completely formed, Lake Miike had a large eruption about 4,600 years ago. Also, Mt. Ohataike and Lake Fudoike had eruption activity with lava.


About 1,500 years ago, the newly active Ohachi Volcano was formed. Mt. Shinmoedake began erupting again and Mt. Io was formed at the Ebino Plateau. There are many records of the damage caused by these eruptions.


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