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Megata Volcano | John Seach
(Ichinomegata)
Honshu, Japan
39.95 N, 139.73 E
summit elevation 291 m
Maars
Megata volcano in located NW of Akita city in northern Honshu. The volcano consists of three Maars on the Oga Peninsula: Ichinomegata (600 m diameter), Ninomegata, Sannomegata. Toga maar formed 450,000 years ago and is breached by the sea on the western side.
It is hypothesised that host magma of Ichinomegata is a product of mixing of three magmas: primitive basalt, slightly differentiated basalt and dacite.
The most recent eruptions occurred less than 4000 years ago.
Further Reading
Abe, N. and Arai, S., 1993. Petrographical characteristics of ultramafic xenoliths from Megata volcano, the Northeast Japan arc. Sci. Rep. Kanazawa Univ, 38, pp.1-24.
Aoki, K.I. and Kameyama, E., 1970. Clinopyroxene megacrysts from Itino-megata volcano, northeastern Japan. The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists, 63(4), pp.160-165.
Megata Volcano Eruptions
2050 BC?, 7050 BC?