there are four main tectonic sub-units within the Himalaya: the sub-Himalaya, Lesser Himalaya, Central Himalayan Domain and Indus Suture Zone. The Himalaya's foothills or sub-Himalaya are Miocene to Pleistocene sediments that have eroded off the mountain range during its uplift. These sedimentary rocks have been highly deformed by the continued uplift of the Himalaya. The upper Proterozoic to lower Cambrian Lesser Himalaya sedimentary rocks represent the Himalaya's main range front. These rocks are often thrusted over the alluvial rocks of the sub-Himalaya. The Lesser Himalaya also contains granites and felsic volcanic rocks. The Central Himalayan Domain contains rocks from the Tethys Ocean and is also intruded by Miocene granites, related to the formation of the Himalaya. The Indus Suture Zone is the suture zone with the Lhasa terrane to the north. It contains the ophiolites and island arc related igneous rocks mostly from the Mesozoic. Qilianshan Orogen The Qilianshan Orogen (also Qilian Shan Orogen) formed in the Early to Mid Paleozoic in modern North West China. The rocks of the region record a Cambrian to Devonian subduction accretion complex. Central Asian Origenic Belt This is a wide zone of tectonic suturing that in part represents the closure of the Paleo-Asian Ocean. During this closure abduction was occurring on both sides of the ocean. This has formed seduction related Paleozoic orthogneiss throughout the sequence. This zone represents the largest accretionary origenic sequence in the world. Su-Lu Orogen The Su-Lu Orogen (also Dabie-Sulu or Sulu orogen) formed during the Mesozoic in what is now the central eastern coast of China. Within this zone are exposed the largest zone of ultrahigh-pressure metamorphic rocks in the world. These originally formed deep within a subduction zone, where oceanic crust from the South China Block went beneath the North China Block during the Triassic. The region was also intruded by granites from the same time period. Qinling Dabie The Qinling Dabie represents the suture zone between the North and South China cratons in the Triassic. The orogenic belt started to form 2.5 billion years ago in the Proterozoic. Earthquakes The collision of India with the rest of Asia has led to seismic activity throughout western China, particularly in Tibet and the Yunnan, Xinjiang, Sichuan, Gansu and Qinghai provinces. However, these regions in comparison with eastern China have a low population density. These areas also in general have poorer transport and building codes. Throughout China poor building