Krakatau Volcano and its Geological Structure

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Other Title
  • クラカタウ火山とその周辺の地質構造
  • クラカタウ カザン ト ソノ シュウヘン ノ チシツ コウゾウ

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Description

The Krakatau Volcano Complex lies at the intersection of two graben zones in Sunda Strait. The Sunda Strait is located in a transitional zone between two different modes of subduction, the Java frontal and Sumatra oblique subductions. Western Java and Sumatra are, however, geologically contineous. The Krakatau complex lies a north-south active shallow seismic belt, which coincides with a fracture zone along the seismic belt with fissure eruption of alkali basaltic rocks commenencing at Sukadana and continuing southward as far as the Panaitan island through Rajabasa, Sebuku and Krakatau.Recent crustal earthquakes in the Sunda Strait area are clustered into three groups, beneath the Krakatau, inside a graben in the western part of the strait and in a more diffuse zone south of Sumatra. The individual and composite focal mechanisms of the events inside the strait show an extensional regime.These results confirm that the Sunda Strait is under a tensional tectonic regime as a result of clockwise rotation along the continental margine and northward movement of the Sumatra sliver plate along the Semangko fault zone.

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