Active tectonics of the Eastern Himalayan foothills region and adjoining Brahmaputra Basin based on satellite images

Deformation pattern of sedimentary rocks of the Eastern Himalayan foothills and other features developed in the adjoining Brahmaputra Basin are displayed prominently on satellite images. Siwaliks of the Arunachal Himalayas show severe effect of tectonic movements suffered by the region, whereas those of the Bhutan Himalayas appear to have been less affected. A prominent tectonic block, the Dafla Hills block, could be identified in the Arunachal Himalayas, revealing the nature of tectonic forces prevailing in the region and this region also could act as a source for generating future earthquakes. East of this block, the Siwalik rocks display spectacular deformation pattern. Northward movement of basement rocks below the Siwaliks is recorded in the region of Hatisar Gap wherein the Siwalik rocks are missing and probably dragged in along with the basement. Alluvium faults observed at some places are the testimony of recent operative tectonic activity in the region. It also appears that the Brahmaputra Basin is creeping below the foothills region under prevailing compressional tectonic regime.