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The cooking area of the expedition camp on Ambrym. (Photo: Tom Pfeiffer)
Eruption from Stromboli's NW crater (April 2009). Note the prominent new cone in the eastern (right)...
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Azuma volcano is a group of small stratovolcanoes, shield volcanoes, domes and cinder cones in NE Honshu, Japan, west of Fukushima city.
Historical eruptions were mostly small phreatic eruptions from the Issaikyo volcano at the northern end of the Higashi-Azuma volcanic complex.
The beautiful symmetrical Azuma-Kofuji crater and a nearby fumarolic area at southeast slope containing the 200 m wide Oana crater are the most prominent features of Issaikyo volcano and along with Goshiki-numa and Oke-numa crater lakes popular tourist destinations.
Oana crater has produced several phreataic eruptions in recent decades and contains very powerful fumaroles, producing plumes rising several hundred meters high.
|Volcano type||stratovolcanoes normal or dormant|
|Summit elevation||2035 m / 6,676 ft|
|Azuma volcano eruptions||2008, 1977, 1966, 1952 (?), 1950, 1914, 1896, 1895, 1894, 1893, 1893, 1844, 1800 (?), 1711?, 1331, 600 AD ± 200 (RC), 150 BC ± 200 (RC), 950 BC ± 100 (RC), 1800 BC ± 50 (RC), 2750 BC ± 200 (RC), 3000 BC ± 50 (RC), 4150 BC ± 500 (RC), 4550 BC ± 1000 (TC), 5400 BC ± 200 (RC), 5700 BC ± 50 (RC)
(RC: radiocarbon-dated, TC: tephrochronology
|Typical eruption style||explosive (phreatic)|
The Azama volcanic complex is mostly basaltic to andesitic in composition and forms two E-W aligned rows. It is one of the active volcanoes at the volcanic front of the Northeast Japan arc. Older andesitic cones were built more than 30,000 years at the western end. Volcanic activity has migrated from W to E over time, and the Higashi-Azuma volcano group at the eastern end are the youngest.
The recent craters are concentrated within a NW-SE trending, 3-km-long, and 1-km-wide zone through Jododaira; Goshikinuma, Issaikyo, Issaikyo-minami, Oana, Tsubakurosawa, Iwotaira-minami, Kofuji, and Okenuma craters from north to south.
There are at least 5 magmatic unit and 7 phreatic ones and were produced during eruptions including Vulcanian explosions. More than 99% of the magma had erupted from Kofuji crater.
adapted from: Y. Takahiro (2005) "Eruptive history of Azuma volcano, NE Japan, during last 7,000 years: Stratigraphy and magmaplumbing system of the Azuma-Jododaira products.", Journal of the Geological Society of Japan, v. 111 (2), pp 94-110
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