Japan · Maar
Megata
- Type
- Maar
- Elevation
- 160m
- Last eruption
- -2050
- Type
- Maar
- Country
- Japan
- Region
- Northwestern Pacific / Northeast Japan Volcanic Arc
- Elevation
- 160m
- Coordinates
- 39.950, 139.725
- Last eruption
- -2050
- Tectonic setting
- Subduction zone / Continental crust (> 25 km)
- Landform
- Minor (basaltic)
- Major rock type
- Andesite / Basaltic andesite
Geological summary
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).
Excerpt from the Global Volcanism Program, Smithsonian Institution · Read the full summary on GVP →
From Wikipedia
Megata is a volcanic group on the Oga Peninsula in northwestern Honshu, Japan. It consists of three basaltic-to-dacitic maars at the edge of the peninsula. These maars measuring between 300 m (980 ft) and 600 m (2,000 ft) across are filled with water, forming freshwater lakes. Ichinomegata is the widest and oldest of the three. These features date to around the Pleistocene although pottery discovered between layers of tephra has been dated to 4,000 years before present. An older and larger maar is located offshore on the western coast of the peninsula, known as Toga (Togowan), it formed 450,000 years ago. The western wall of Toga maar is breached, forming a bay.
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Eruption history
2 recordedGlossaryRecord summary
- Confirmed eruptions
- 2
- Uncertain eruptions
- 0
- Span of confirmed record
- 7050 BCE – 2050 BCE
- Largest confirmed eruption
- No VEI recorded
- Confirmed eruptions since 1900
- 0
Detailed timeline
- 2050 BCEVEI ?Geological estimate2050 BCE – end unknown
- 7050 BCEVEI ?Geological estimate7050 BCE – end unknown
Nearby volcanoes
External links
⚠ For reference only. Not for emergency response.