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Available Weekly Reports
There are no Weekly Reports available for Towada.
Summary of eruption dates and Volcanic Explosivity Indices (VEI).
|Start Date||Stop Date||Eruption Certainty||VEI||Evidence||Activity Area or Unit|
|0915 Aug 17||Unknown||Confirmed||5||Historical Observations||Goshikiiwa (NE rim Nakanoumi crater)|
|0750 BCE (?)||Unknown||Confirmed||4||Radiocarbon (corrected)||Nakanoumi, To-B tephra|
|4150 BCE (?)||Unknown||Confirmed||5||Radiocarbon (corrected)||Goshikiiwa (Nakanoumi), To-C tephra|
|5550 BCE (?)||Unknown||Confirmed||3||Radiocarbon (corrected)||Goshikiiwa, To-D' tephra|
|6250 BCE (?)||Unknown||Confirmed||4||Radiocarbon (corrected)||Goshikiiwa, To-D tephra; Oguni Pumice|
|7250 BCE (?)||Unknown||Confirmed||5||Radiocarbon (corrected)||Goshikiiwa, To-E tephra; Nambu Pumice|
|8250 BCE (?)||Unknown||Confirmed||5||Radiocarbon (corrected)||Goshikiiwa, To-F tephra|
|9490 BCE (?)||Unknown||Confirmed||3||Radiocarbon (corrected)||Nakanoumi, To-G tephra; Shingo Pumice|
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, 1983. Chuseri tephra formation from Towada volcano, Japan. Bull Volc Soc Japan (Kazan), 28: 263-273 (in Japanese with English abs).
Hayakawa Y, 1985. Pyroclastic geology of Towada volcano. Bull Earthq Res Inst, Univ Tokyo, 60: 507-592.
Hunter A G, Blake S, 1995. Petrogenetic evolution of a transitional tholeiitic-Calc-alkaline series: Towada volcano, Japan. J Petr, 36: 1579-1605.
Japan Meteorological Agency, 2013. National Catalogue of the Active Volcanoes in Japan (fourth edition, English version). Japan Meteorological Agency.
Kudo T, 2008. Radiocarbon ages of the eruptive products from the eruptive episodes E and G, Towada volcano, northeast Japan. Bull Volc Soc Japan (Kazan), 53: 193-199 (in Japanese with English abs).
Nakagawa H, Chuman N, Ishida T, Matsuyama T, Nanasaki O, Oide K, Oike S, Takahashi H, 1972. Historical development of Towada volcano-an outline. Tohoku Univ Inst Geol Paleont Contr, 73: 7-18 (in Japanese with English abs).
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/.
The dramatic, 11-km-wide, lake-filled Towada caldera formed during as many as six major explosive eruptions over a 40,000-year period ending about 13,000 years ago. Pre-caldera eruptive activity dates back about 2 million years and produced basaltic-to-dacitic lava cones. Following late-Pleistocene andesitic-to-rhyolitic caldera-forming eruptions, the basaltic Ninokura stratovolcano grew in the SSE section of the caldera. Successive dacitic-to-rhyolitic Goshikiiwa explosive eruptions led to the formation of the roughly 2-km-wide Nakanoumi caldera, whose SW and NE rims form dramatic peninsulas extending into Lake Towada. The andesitic-to-dacitic Ogura-yama lava dome was built over the NE rim of Nakanoumi. The latest eruption took place in 915 CE, when eruptions from Ogurayama produced widespread ashfall and pyroclastic flows.