No latest activity reported for Myoko.

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.

Hayatsu K, 1976. Geologic study on the Myoko volcanoes, central Japan - Part 1. Stratigraphy. {Kyoto Univ Ser Geol Min}, 42: 131-170

Hayatsu K, 1985. {Myoko volcano group - its geology and history}. Tokyo: Daiichi-Shuppan, 344 p (in Japanese)

Hayatsu K, Arai F, 1980. Tephrochronological study on the Myoko volcano tephra layers and their relation to activity of the volcano. {J Geol Soc Japan}, 86: 243-263 (in Japanese with English abs)

Hayatsu K, Shimizu S, Itaya T, 1994. Volcanic history of the Myoko volcano group, central Japan; a poly-generation volcano. {J Geogr}, 103: 207-220 (in Japanese with English abs)

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

Kawachi S, Hayatsu K, 1994. Debris avalanche and lahar deposits in the Yatsugatake volcanic chain and Myoko volcano, central Japan. {J Nat Disaster Sci}, 16: 55-69

Kudo T, Hoshizumi H, 2006-. Catalog of eruptive events within the last 10,000 years in Japan, database of Japanese active volcanoes. Geol Surv Japan, AIST, http://riodb02.ibase.aist.go.jp/db099/eruption/index.html

Kuno H, 1962. Japan, Taiwan and Marianas. {Catalog of Active Volcanoes of the World and Solfatara Fields}, Rome: IAVCEI, 11: 1-332

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/

Myoko is a steep-sided stratovolcano north of Nagano City that overlooks the popular resort of Lake Nojiri below its SE flank. A 3-km-wide caldera breached widely to the east is filled by a flat-topped lava dome that forms the basaltic-to-dacitic volcano's summit. Myoko volcano was constructed during four stages beginning about 300,000 years ago, each evolving from basaltic to andesitic and dacitic eruptions. The latest eruptive stage began about 43,000 years ago. Several episodes of edifice collapse at Myoko during the late Pleistocene to early Holocene have produced major debris avalanches that traveled to the east and NE. Myoko produced pyroclastic flows down the eastern flanks of the volcano during the mid Holocene about 5800 and 4200 years ago, and the latest dated eruption produced pyroclastic surges about 2800-2500 years ago. No historical eruptions are known at Myoko, but constant solfataric activity occurs between the dome and the south caldera wall at a place where sulfur was once mined.