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Island arcs, deep-sea trenches, and seismofocal zones of Indonesia and the Pacific Ocean: Similarity and distinctions

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Abstract

The available geological, gravimetric, and seismological data suggest that island arcs, deep-sea trenches, and seismofocal zones of Indonesia (as a part of the Alpine-Indonesian mobile belt) differ significantly from structures of the same names of the Pacific ring proper. Thus, seismofocal zones of the ring are characterized by the stress-strain conditions of subhorizontal across-strike compression at depths of 0–400 km. In seismofocal zones of the mobile belt, such conditions exist only in the depth interval ∼(0–40) km. At depths of about 40 to 400 km, lengthening (the T axis) is oriented along the dip-updip direction of a zone, whereas shortening (the P axis) is oriented along the strike of a seismofocal zone or, if individual P axes are not well ordered in this depth interval, they are scattered near the plane normal to the lengthening axis. We relate these distinctions to the fact that the mobile belt inherits a geosynclinal, rather than oceanic, basin that cannot be regarded as a huge bay of the paleo-Pacific. The aforementioned data imply that SW Melanesia (the New Guinea Islands, Bismarck Archipelago, and Solomon Islands) includes the recent Bismarck geosynclinal zone located on the strike of the Indonesian segment of the Alpine-Indonesian mobile belt.

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Original Russian Text © A.A. Lukk, V.I. Shevchenko, 2008, published in Fizika Zemli, 2008, No. 2, pp. 3–38.

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Lukk, A.A., Shevchenko, V.I. Island arcs, deep-sea trenches, and seismofocal zones of Indonesia and the Pacific Ocean: Similarity and distinctions. Izv., Phys. Solid Earth 44, 85–118 (2008). https://doi.org/10.1134/S1069351308020018

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