Parasitic crater

[ Top ] [ Japanese ]

Parasitic crater Isshiki, 1959

Type locality: Mount Higashiyama, Hachijo city, Tokyo
Volcanic rocks
2 parasitic cones
Pleistocene - Holocene

Lithofacies: Tholeiite series
Lithofacies (eastern cone): Andesite lava
Lithofacies (western cone): Andesite lava, Andesite scoria cone

Source (eastern cone): in the vicinity of 250 m above sea level
Source (western cone): Scoria cone in the vicinity of 160 m above sea level
Thickness (western cone, Lava): several m

Higashiyama volcano
[ Upper ]
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Parasitic crater / Central cone
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Post-caldera cone
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Pre-caldera cone
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[ Lower ]

Hachijojima volcano
[ Upper ]
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Nishiyama volcano
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Higashiyama volcano
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Old volcanoes
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[ Lower ]

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

Distribution (eastern cone): Aigae, Hachijo city, Tokyo
Distribution (western cone): Occhogahama, Hachijo city, Tokyo

Isshiki (1958) Hachijo-jima, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 58p. (in Japanese with English abstract 5p.)