Abstract
An interpretation of the occurrence conditions and source parameters is proposed for the catastrophic earthquake of December 26, 2004, in the northwestern part of the Sunda island arc. The interpretation is based on the analysis of spatial distributions of aftershock epicenters and regions subjected to destructive tsunamis, seismicity manifestations in the NW part of the Sunda island arc in the past century, and locations of large tsunami sources of historical earthquakes off the Sumatra Island coast. The source parameters of the December 26, 2004, earthquake are compared with the reliably established main characteristics of sources of the largest tsunamigenic earthquakes in island arcs of the Pacific Ocean. According to the proposed interpretation, the December 26, 2004, earthquake source is a steep reverse fault striking NW and dipping toward the Indian Ocean. The source, ∼450 km long, is located in front of the NW termination of Sumatra Island, in the southern part of the Nicobar Islands. Possible positions and sizes of large potential seismic sources in the NW part of the Sunda island arc are suggested.
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Original Russian Text © L.M. Balakina, 2006, published in Fizika Zemli, 2006, No. 5, pp. 25–46.
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Balakina, L.M. The seismic catastrophe of December 26, 2004, in the Indian Ocean as a tsunamigenic earthquake in island arc structures. Izv., Phys. Solid Earth 42, 377–397 (2006). https://doi.org/10.1134/S106935130605003X
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DOI: https://doi.org/10.1134/S106935130605003X