No latest activity reported for Haruna.

Below is a summary of eruption dates and Volcanic Explosivity Indices (VEI).

The following references are the sources used for data regarding this volcano. References are linked directly to our volcano data file. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title. Additional discussion of data sources can be found under Volcano Data Criteria.

Hayakawa Y, Soda T, Arai F, 1993. Asama and Haruna volcanoes: recent eruptions and hazards. {Climatic impact of explosive volc conf, Tokyo, Dec 3-4, 1993}, 28 p guidebook

IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. {IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior}.

Japan Meteorological Agency, 1996. {National Catalogue of the Active Volcanoes in Japan (second edition)}. Tokyo: Japan Meteorological Agency, 502 p (in Japanese)

Machida H, Arai F, 1992. {Atlas of tephra in and around Japan}. Tokyo: Univ Tokyo Press, 276 p

Nakano S, Yamamoto T, Iwaya T, Itoh J, Takada A, 2001-. {Quaternary Volcanoes of Japan}. Geol Surv Japan, AIST, http://www.aist.go.jp/RIODB/strata/VOL_JP/

Ono K, Soya T, Mimura K, 1981. Volcanoes of Japan. {Geol Surv Japan Map Ser}, no 11, 2nd edition, 1:2,000,000

Suzuki T, 1996. Discharge rates of fallout tephra and frequency of plinian eruptions during the last 400,000 years in the southern Northeast Japan arc. {Quat Internatl}, 34-36: 79-87

Haruna volcano is truncated by a small summit caldera containing the symmetrical post-caldera pyroclastic cone of Haruna-Fuji. Haruna-san volcano dates back prior to 300,000 years ago and had caldera-producing eruptions at about 200,000 and 40,000 years ago. Viscous lava flows and lava domes were subsequently extruded within and around the caldera, the western side of which is currently partially filled by Lake Haruna. The Futatsu-dake lava dome east of the caldera was the source of two large explosive eruptions during the 6th century AD.