Frequency magnitude distribution and spatial correlation dimension of earthquakes in north-east Himalaya and adjacent regions

Abstract The north-east sector of the Himalaya is one most active tectonic belts, with complex geological and features. b-value spatial correlation dimension (D c ) earthquake distribution in its adjacent regions (20–32°N 88–98°E) are estimated present study. Based on seismicity faulting pattern, region divided into five regions, namely (i) South-Tibet, (ii) Eastern-Syntaxis, (iii) Himalayan-Frontal Arc, (iv) Arakan-Yoma belt (v) Shillong-Plateau. A homogeneous catalogue 1,416 earthquakes (mb ≥ 4.5) has been prepared from a revised ISC (International Seismological Centre). appraised by maximum likelihood estimation method, while D values have calculated integral method; b-values 1.08 ± 0.09, 1.13 0.05, 0.92 1.00 0.03 0.98 0.08 computed for Shillong-Plateau region, respectively. respective 1.36 0.02, 1.74 0.04, 1.57 0.01, 1.8 1.83 0.02. These > 1.5, except South-Tibet (1.36 0.02). around global average value (1.0) reflect stress level seismic activity high refer to heterogeneity seismogenic sources.