Ground Tilting in Likhabali Area along the Frontal Part of Arunachal Himalaya: Evidence of Neotectonics

Present study along frontal part of the Sub-Himalayan tenam suggests neotectonic activities along thrusts and faults. Neotectonics is evident from geomorphic features such as development of terraces, stream incision, preferred stream migration and the thrusting of the Siwalik rocks over the Quaternary deposits. Southward Himalayan foreland propagation thrusting has resulted in ground tilting in the frontal part of the Himalaya and has led the streams to migrate towards Southwest. On the other hand the stream in the Sub-Himalayan terrain flows parallel to the trend of the Arunachal Himalaya, and has migrated southward. The calculated mountain front smuosity index reflects relative tectonic activity in the mountain front Thrusts and taults have controlled the drainage channels of major streams. Recent seismic activities have triggered massive landslides, which blocked the streams temporarily.