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IJMS Vol.36(2) [June 2007] >


Title: Application of fractal in marine sciences: Study of the 2004 Sumatra earthquake (Mw 9.3) sequence in Andaman-Nicobar islands
Authors: Bhattacharya, Pankaj Mala
Kayal, J.R.
Keywords: Fractal dimension
Earthquake hypocenters
Heterogeneity
Seismogenic
Issue Date: Jun-2007
Publisher: CSIR
Abstract: Aftershock sequence of the 26 December 2004, Sumatra-Andaman mega thrust event (Mw 9.3) that resulted a rupture of about 1300 km in the ocean floor, Sumatra to Andaman-Nicobar islands, is studied to evaluate the fractal dimension of the oceanic tectonic features. A large number of aftershocks (Mw  3.0) are recorded by temporary network that was established by the Geological Survey of India (GSI) in the Indian state of Andaman-Nicobar islands. The complex geological structures that include the Andaman trench, West Andaman fault and the backarc spreading zone , Andaman spreading Ridge (ASR), in the region generated a rupture area 800  300 km2 below the Andaman – Nicobar islands. The Fractal dimension was estimated using correlation dimension method and the box counting method. Epicenters of 1100 well located earthquakes were considered for the analysis. A prominent N-S trending contour with fractal dimension between 0.90 - 1.30 indicates that the epicenters are linear, or almost one dimensional that correlates with the West Andaman fault. The box counting method estimated the fractal dimension 1.17 for this linear fault that lie between the trench and the back arc spreading zone in the ocean basin. The higher fractal dimension (>1.5) contours on both sides of the West Andaman fault indicate the extent of 2D heterogeneity of the Andaman Trench and the ASR. The fractal dimension values for the entire region suggests that the faults are spatially distributed in the whole region, and the whole region is seismically active.
Page(s): 136-140
ISSN: 0379-5136
Source:IJMS Vol.36(2) [June 2007]

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