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Fractal and b-Value Mapping in Eastern Himalaya and Southern Tibet

National Geophysical Research Institute, (Council of Scientific and Industrial Research), Uppal Road, Hyderabad-500 007, Andhra Pradesh, India chandranigoswami{at}rediffmail.com

Fractal (correlation) dimension and b-value are determined from 1300 well-located earthquakes recorded at 32 seismic stations in eastern Himalaya and southern Tibet during 1993–2003. The spatial correlation of 0.9 is indicative of more clustered events in the region, while a b-value of 1.02 implies a highly active seismic region. A detailed study of the frequency–magnitude distribution and fractal dimension as a function of depth is also made. The results suggest structural variability at different depth levels in the Tibet–Himalaya collision zone that reflects highly heterogeneous and high-grade metamorphism in the region.