(2) Ganga-Brahmaputra Valley Explanation: The Ganga-Brahmaputra basin is a high earth-quake risk zone. It comes under Zone 5 covers the areas with the highest risks zone that suffers earth-quakes of intensity MSK DC or greater. Experts warn that as many as a million deaths could be expected on the Ganges and Brahmaputra plain, as the southern flank of the Himalayas has not been active enough over past centuries to release the energy accumulated by the upward movement of the Indian plate.