Geological Sites

Area AreaSummit CalderaSummit Caldera

The large rocks are masses of agglutinate. Agglutinate is formed by the accumulation of spatter from lava fountains during the 1986 eruption. Look closely, you can see that the mass is made up of lava fragments of various sizes stuck together.

In the 1986 eruption, lava filled up the crater and overflowed. Then the huge agglutinate formed in the crater broke, and part of the mass floated in the lava flow. It was carried about 500 m but ran aground here, just before descending the slopes of Mt. Mihara.

Inside the agglutinate

The path created by cutting through agglutinate

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