An ash plume rises from the Shinzan lava dome at the summit of Chokaisan on 1 March 1974 after a repose of 140 years. Phreatic eruptions occurred in March and April that produced small lahars. The eruptions took place from an E-W-trending series of vents extending from the eastern caldera wall across the 1801 Shinzan lava dome and the Kojinyama cone. This view from the NW shows the eastern caldera wall behind the dome.

Photo courtesy of Japan Meteorological Agency, 1974.

This image is made available under the Creative Commons BY-NC 4.0 license terms.

Galleries: Lava Domes | Ash Plumes and Ashfall

Keywords: lava dome | plume | ash plume | ash | eruption | plume | wind dispersal

Chokaisan