Active tectonics investigations between the Dibang and Lohit River valleys NE Himalaya Arunachal Pradesh

Abstract

The study area lies in the Mishmi range in the eastern arm of the Eastern Himalayan newlineSyntaxis (EHS), which owes its structural complexity because of ongoing convergence in both newline~N-S and E-W directions, resulting in oblique thrusting and clockwise rotation of fault-bounded newlineblocks. Here, major Himalayan structures and lithology continue in a north to south direction newlineexcept frontal Neogene Siwalik of Sub-Himalayan range and Tethyan Himalayan Sequence of newlineHigher Himalaya. The region not only has orthogonally aligned major structures, but also sparsely newlinedistributed seismicity compared to the ~E-W trending Himalayan range. Recent seismological newlinestudy across the Mishmi range shows gently east dipping Moho beneath the range. Whereas GPS newlinestudy shows ~20 mm/yr convergence across the range which is equivalent to the rates across the newlinecentral Himalaya. newline