China Geological Survey issued a preliminary four-Chuan Wenchuan earthquake reason
After a detailed determination of earthquake parameters, the China Seismological Bureau to Wenchuan from the 7.8 magnitude earthquake revised to 8. Wenchuan earthquake had a preliminary conclusions of the reasons. China Geological Survey finds that the initial monitoring and evaluation, Wenchuan earthquake in India to the Asian plate subduction, resulting in rapid uplift of the Qinghai-Tibet Plateau caused by focal depth of 10 km -20 km and a longer duration, the huge destructive.
18 reporters from the Ministry of Land and Resources was informed that 15 years, China Geological Survey and the convening of Wenchuan earthquake-induced secondary analysis of the situation would Geological disasters, the Chinese Land and Resources Center for Remote Sensing airborne geophysical exploration, geological China Environmental Monitoring Center, Chinese Academy of Geological Sciences, Chinese Academy of Geological Sciences geology, geomechanics, and other units are based on surveys of experts to monitor and evaluate the results of the study, the disaster of "consultations" on the shape of the three conclusions.
First, the Indian plate subduction to Asia, resulting in rapid uplift of the Qinghai-Tibet Plateau. The slow movement of material plateau to the east, along the eastern edge of the plateau in the Longmen Mountains to the east structural zone squeezed, the Sichuan Basin under the rigid face of strong block to block, caused by tectonic stress energy of the long-term accumulation in the final Longmenshan Kitagawa - Ying Show the release of all of a sudden the region.
Second, the thrust, right, squeeze-fault earthquake. Seismogenic structure is constructed with the central Longmenshan fault zone, squeezed under stress from southwest to the north east thrust movement; the earthquake-way belonging to the earthquake rupture from the southwest to the north east migration, resulting in the east to the north of aftershocks To the expansion; squeeze-thrust earthquake in the main shock, stress and the spread of the release process is relatively slow, aftershocks could lead to a greater intensity, longer duration.
Third, shallow earthquake. Wenchuan earthquake does not belong to the deep effects of the plate boundary, took place in the brittle crust - toughness with the conversion, the focal depth of 10 km - 20 km, the enormous destructive.
