The study of the spatial distribution of strain and stress accumulation in a continent-continent convergent system is significant for seismic hazard assessment. The Indian Plate is moving towards the north-east at a pace of 5cm/year, according to GPS velocity vectors. Since the Main Central Thrust (MCT) was active from 23 Ma to 12 Ma, when the Eurasian and Indian Plates collided for the first time, The Main Boundary Thrust (MBT) was formed by continuous collision to the south of the MCT, which continued until 3 Ma. The Main Frontal Thrust (MFT) is newly formed in the Himalayan Orogeny and is still tectonically active. This tectonically active area has been divided into four regions according to the computed ‘b’ value distribution. Regions 2 and 3 represent the inverse relationship between magnitude and frequency distribution. The magnitude range is greater than the frequency in Region 2, while the frequency distribution is greater than the magnitude in Region 3. In an overview of such alteration, two selected watersheds, namely Kameng from R-3 (Region 3) and Dibang from R-2 (Region 2), display the different values of the index of active tectonics (IAT), considering the sub-basins. Here parameters like the basin shape index (Bs), the compactness coefficient (Cc), the form ratio (Rf), the circularity ratio (Rc), the leminscate coefficient (k), the hypsometric integral (HI), the stream gradient index (SL), and the sinuosity index (SI) have been considered to compute the IAT. According to the overall average range of the IAT of the two watersheds, Kameng is more active (2.198) than Dibang (2.272). The VP and VS anomalies at 20 km, 40 km and 60 km indicate that the Kameng watershed is more active than Dibang as the higher range of VP and VS at a depth of 20 km lies near the foredeep section and it is also supported by the location of active sub-basins between the MBT (Main Boundary Thrust) and the MFT (Main Frontal Trust). The active crustal shortening across the southern part of the Kameng River, around the Main Frontal Thrust Décollement Zone, intensifies the plate movement by 10 mm/year along the section of R-3.
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The authors convey a token of thanks to the Geography Department, Presidency University, Kolkata. We would like to convey our hearty thanks to the editor, associate editor and reviewers of the journal.
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Gupta, S., Biswas, M. Seismo-tectonic and morphological study of the north-east Himalaya. Geosci J 27, 1–21 (2023). https://doi.org/10.1007/s12303-022-0016-z
- north-east Himalaya
- active tectonics