A 60- by 60-mile segment of the Philippine oceanic plate ruptured and thrust itself against the Eurasian continental plate, releasing a massive burst of tectonic energy.
During subduction northward of Neo-Tethys oceanic plate, Ayla-Zhongba micro-continental, the marginal ocean basin and India continental drifted northward all together, the marginal ocean basin was gradually contracted and closed by compressed of India continental.