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Sanbesan stratovolcano in SW Honshu, along the Japan Sea coast, has a summit cut by a small caldera about 1 km in diameter. The highest point on the dacitic-to-andesitic volcano is 1126-m-high O-Sanbe, at the northern end of the complex. Sanbesan has had several large explosive eruptions during the Pleistocene and one strong Holocene eruption from Taiheizan lava dome about 3700 years ago. This eruption was accompanied by pyroclastic flows that swept down the NE-to-SE flanks and traveled 9 km down the Hayamizu River to the SW. Younger, undated eruptions have also occurred (Machida and Arai, 1992).
Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).
|Start Date||Stop Date||Eruption Certainty||VEI||Evidence||Activity Area or Unit|
|0650 ± 50 years||Unknown||Confirmed||Radiocarbon (corrected)|
|1920 BCE (?)||Unknown||Confirmed||4||Tephrochronology||Taihei-zan|
|3550 BCE ± 50 years||Unknown||Confirmed||Radiocarbon (corrected)|
This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.
|Feature Name||Feature Type||Elevation||Latitude||Longitude|
|The summit of Sanbe volcano in SW Honshu, the SW-most Holocene volcano on the island of Honshu, is cut by a caldera. Seen here from the south, the highest peak is called O-Sanbe (Male-Sanbe or Father-Sanbe). It is flanked by Me-Sanbe (Female-Sanbe) on the right, Ko-Sanbe (son) on the left, and Mago-Sanbe (grandson) in the center. Sanbe (also known as Sambe) had a large explosive eruption about 3700 years ago that originated form Taihei-zan lava dome (the lighter-colored area on the west side of the caldera).
Photo by Yoshinobu Tatsu, 1998 (Shimane Prefectural Sanbe Shizenkan Nature Museum).
The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. 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.
Japan Meteorological Agency, 2013. National Catalogue of the Active Volcanoes in Japan (fourth edition, English version). Japan Meteorological Agency.
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.
Kusano T, Nakayama K, 1999. Preliminary report on the depositional processes of block-and-ash flow deposits; an example from the Taiheizan pyroclastic flow deposits at Sambe volcano, southwest Japan. Bull Volc Soc Japan (Kazan): 44: 143-156 (in Japanese with English abs).
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.