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Global Volcanism Program | Image GVP-05652

This outcrop, 5 km SW of the summit of Komagatake, shows a cross section of deposits from the 1640 eruption. The dark section at the base is a debris avalanche deposit produced by collapse of the summit. The reddish-gray section above the ruler is a blast deposit related to the collapse. The thin white unit above the blast deposit is a layer of airfall pumice, which is much thicker at other locations closer to the axis of tephra deposition. The top of the section is a pyroclastic flow deposit. Photo by Mitsuhiro Yoshimoto, 1995 (Hokkaido University).

This outcrop, 5 km SW of the summit of Komagatake, shows a cross section of deposits from the 1640 eruption. The dark section at the base is a debris avalanche deposit produced by collapse of the summit. The reddish-gray section above the ruler is a blast deposit related to the collapse. The thin white unit above the blast deposit is a layer of airfall pumice, which is much thicker at other locations closer to the axis of tephra deposition. The top of the section is a pyroclastic flow deposit.

Photo by Mitsuhiro Yoshimoto, 1995 (Hokkaido University).

Keywords: stratigraphy | geology | field work | outcrop | exposure | debris avalanche deposit | pumice | airfall | tephra


Hokkaido-Komagatake