An ash plume rises from the summit crater of Fugendake on 4 June 1991, the day following deadly pyroclastic flows produced by collapse of a portion of the growing lava dome. The small pond in the foreground fills a crater formed by earlier exposions during the eruption that began in November 1990.

Photo courtesy Takashi Yamada, 1991 (Public Works Research Institute, Ministry of Construction).

Keywords: ash plume | eruption | ash | plume | explosive eruption | lava dome | vent

Unzendake