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Data from the Global Volcanism Program of the Smithsonian Institution
Details for: Megata
Sannomegata (center), seen here from the NW with Toga bay in the foregound, is one of three small Megata maars along the tip of the Oga Peninsula. Lakes 300-700 m wide fill the maars, which are noted localities for mantle-derived xenoliths and are located immediately E and S of Toga Bay. Copyrighted photo by Hiroshi Yagi (Japanese Quaternary Volcanoes database, RIODB, http://riodb02.ibase.aist.go.jp/strata/VOL_JP/EN/index.htm and Geol Surv Japan, AIST, http://www.gsj.jp/).
Volcano Number:
283262
Volcano Name:
Megata
Country:
Japan
Volcano Type:
Maar(s)
Last Eruption:
2050 BCE
Elevation:
160m
Tectonic Setting:
Subduction zone / Continental crust (> 25 km)
Pop. within 5km:
1854
Pop. within 10km:
3577
Pop. within 30km:
81218
Pop. within 100km:
1205440
Latitude:
39.95
Longitude:
139.725
Details
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Megata, a group of three small maars along the tip of the Oga Peninsula in NW Honshu, has been active during the Holocene (Ishikawa et al., 1957). Lakes 300-600 m wide fill the basaltic-to-dacitic maars, which are a noted locality for mantle-derived xenoliths. Ichinomegata, the easternmost, largest, and oldest of the three maars, is 600 m in diameter. Ninomegata and Sannomegata are located immediately E and S of Toga Bay, which itself is a maar. The rim of the rhyolitic Toga (Togowan) maar, larger than the Megata maars, is breached by the sea on the western side and was formed about 450,000 years ago. The Megata maars are mostly late Pleistocene in age, but Murayama (1987) noted that pottery from roughly 4,000 years before present (Jomon Period) has been found within tephra layers from the maars.
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Eruption Data from the Global Volcanism Program of the Smithsonian Institution
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Emissions Data from the Global Volcanism Program of the Smithsonian Institution
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Data from the Earthchem Library
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Data from the Earthchem Portal
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Data from the SESAR Database
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Data from the MaGa Database
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Data from UNAVCO
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Data from USIEI
Sorry. This volcano is not covered by any USIEI projects
Data from IRIS FDSNWS
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