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Spatial variation of seismic b-values across the NW Himalaya

The frequency–magnitude distribution is investigated along the entire north-western Himalaya (28°–36°N; 72°–81°E). The analysis includes a complete set of 1819 earthquakes of Mb ≥ 2.9 taken from the International Seismological Catalogue (ISC) bulletin which occurred between 1964 and 2010. The study area has been divided into three blocks (A, B and C) that include the Kashmir, Kangra–Chamba and Garhwal–Kumaun segments, respectively. The b-value of each block has been determined to see the disparity among the different segments. A comprehensive study of the spatial mapping of frequency–magnitude distribution is also made for the whole area. Significant variations in the b-value are detected with b ranging from b ≈ 0.6 to 1.3. The study shows that the accumulated stresses are high at the Kumaun as well as in the Kangra–Chamba region which may indicate the possibility of future large earthquakes at these locations.