Active tectonics along the frontal part of hft, in and around pasighat, east siang district, Arunachal Pradesh

The study area in and around Pasighat is bounded between two major collision originated orogenies, NE-SW trending Himalayan orogene and NW-SE trending Mishimi Hills. Evidence such as discontinuous mountain front, different levels of terrace in the rivers, presence of number of cross-faults implies that the whole area is in transient state and active tectonics is modifying the geomorphology of the area. In the present study, mapping of the terraces present in the frontal part of the area is carried out and different level of terraces area marked. By observing the local gradient of each level and compared with that of the present river bed, it is inferred that most of the terraces undergoes considerable degree of warping and post depositional tilting has occurred in those particular locality. Further, occurrence of earthquakes having magnitude > M5 in the vicinity of the crossfaults also testify the activeness of the region.