Geological Sites

Area AreaSummit CalderaSummit Caldera

During the eruption of Mt. Mihara from 1950-51, lava overflowing from the crater flowed down the slope of the mountain. A portion of the lava surface solidified to form a tube through which lava flowed. Hornitos are the small hills that have been raised by gas and lava spewed out from the broken ceiling of the tunnel. Under this hornito is a space 10m wide, 15m long, and 6m high, and beyond this is a tunnel over 10m long. Hornitos are formed in pahoehoe lava, the most fluid type of lava. The smooth surface of pahoehoe lava can be seen covering the surrounding ground.

West face of Hornito

Inside the lava tunnel

Location Information