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Akusekijima

Estratovolcán · Japan · 555 m

Akusekijima is seen from the N with the Omune lava flow forming a plateau in the foreground. The dacitic lava flow, the youngest featute, has experienced little erosion and lacks overlying tephra layers, suggesting a young age. Akusekijima is located in the southern Ryukyu Islands, and consists of the two older Biroyama and Nakadake edifices. The Mitake lava dome (right) forms the high point of the small 2.5 x 3.2 km island.
Akusekijima is seen from the N with the Omune lava flow forming a plateau in the foreground. The dacitic lava flow, the youngest featute, has experienced little erosion and lacks overlying tephra layers, suggesting a young age. Akusekijima is located in the southern Ryukyu Islands, and consists of the two older Biroyama and Nakadake edifices. The Mitake lava dome (right) forms the high point of the small 2.5 x 3.2 km island. · Foto: Copyrighted photo by Shun Nakano, 2004 (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/). · Wikimedia Commons
Tipo
Estratovolcán
País
Japan
Región
Western Pacific Volcanic Regions / Ryukyu Volcanic Arc
Altitud
555 m
Coordenadas
29.465, 129.594
Última erupción
Desconocido
Contexto tectónico
Subduction zone / Oceanic crust (< 15 km)
Forma volcánica
Composite
Roca principal
Andesite / Basaltic Andesite
Resumen geológico

Akusekijima is a small stratovolcano in the southern Ryukyu Islands. Most of the island is surrounded by steep cliffs, and beaches are found only on the SW and SE sides. The andesitic-dacitic volcano consists of two older somma volcanoes, Biroyama and Nakadake. Mitake lava dome forms the high point of the small 2.5 x 3.2 km wide island. The dacitic Omune lava flow on the NE flank was K-Ar dated at less than 80,000 BP; its youthful morphology and lack of overlying tephra layers suggests it could be as young as the Holocene (Furuyama et al., 2002). The lava flow, the youngest product of the volcano, forms a low-angle plateau overlying cliffs forming the northern coast.

Resumen de Wikipedia

Akusekijima es una isla volcánica situada en la Islas Tokara en la parte norte de la islas Ryukyu, Japón. La mayor parte de la isla está rodeada por acantilados. El acceso a la isla se limita al "Ferry Toshima", que sólo funciona dos veces a la semana y el viaje dura 11 horas desde Kagoshima. Esta pequeña isla tiene sólo 77 habitantes y todos ellos dependen de la lluvia como su principal fuente de agua. Los residentes que poseen coches tienen que comprar bidones de gasolina, que les son enviados desde Kagoshima, además desde esa localidad se les envían los comestibles y otras necesidades de abastecimiento. La isla es un pequeño volcán de 584 metros de altura.

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