Abstract
Study of recent seismicity and b-value estimation by Least Square and Maximum Likelihood Estimation methods in five tectonic blocks of Northeast India demarcates indo Burma Belt, Main Central Thrust, Main Boundary Thrust, Shilling Plateau, Mikir Hills and Kopili Lineament as active seismic source of the region. Spatial variation of b-value is observed by dividing the study area into 1 0 ×1 0 grids. Higher b-value contours depict the highly seismic area with structural heterogeneity, while lower b-value contours indicate the areas under high stress. b-values are observed in the range of 0.437 - 0.908 and mostly concentrated around 0.7, indicating high stress accumulation.
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