By Prof J R Kayal
Prof J R Kayal is CSIR Emeritus Scientist, Jadavpur University, Kolkata, email@example.com.
Reprint Vol. 11, Issue 64, pp 6-12, Geography and You.
The Indian plate, separated from the Antarctic, started moving to the north northeast about 180 million years ago. The present day movement of the Indian plate from the Carlsberg spreading ridge results in collision in the Himalaya and subduction in the Andaman-Sumatra. These plate margins, therefore, are the major seismic belts of the moving Indian plate.
Identifying Tsunami Risk Zones The concept of plate tectonics is the most satisfying explanation for a majority of earthquakes. The basic idea of plate tectonics involves earth’s outermost part, the lithosphere (100-200 km thick), which consists of several large and fairly stable slabs - the plates. Boundaries of these plates are the seismic belts of the world. At the mid oceanic ridges, upwelling of lava is a continual process. This molten rock creates new sea floor on either side of...