preview

How The Initial Collision Occurred?

Good Essays
The following steps are of how the initial collision occurred and how the thrust fault fractured the crust in the area. Millions of years ago, at the edge of the Indian plate, the oceanic lithosphere was being subducted under the southern Tibet. First, granite intrusions were formed as magma rises above the Indian plate. As a result of oceanic crust and sediments piling up onto the non-subducting plate, an accretionary wedge is formed. This developed a forearc basin (which is a sedimentary basin formed between a subduction zone and a volcanic arc) that trapped the destroyed sediments from Tibet. Second, a new fault broke through the Indian crust called Main Central Thrust because the Indian plate was too buoyant to descent under the southern Tibet. Therefore, the ongoing movement along the fault continued. Third, part of the Indian crust was pushed on the oncoming subcontinent and the accretionary wedge and the forearc basin were pushed northward onto Tibet, where most of the material has been eroded. The Main Central Thrust then became inactive and since then, India has drifted northward along the Main Boundary Fault. Fourth, another crust part has been pushed onto the subcontinent, lifting the first part up. As a result of the uplifting of both parts, the bulk of the Himalayas is formed. In the case of the Nepal earthquake, the Indian and Eurasian plate below the surface of Nepal that flow above magma, collide with one another. As neither plate wants to move, the Indian
Get Access