INFLUENCE OF KUNLUN MOUNTAIN Ms8.1 EARTHQUAKE ON CRUSTAL MOVEMENT IN SICHUAN-YUNNAN REGION
昆仑山Ms8.1地震对川滇地区地壳运动影响分析

The correlation between crustal deformation in Sichuan-Yunnan region and Kunlun Mountain Ms8.1 earthquake was analyzed by use of GPS data.The results showed that there is good correlation between the displacements at a part of GPS stations in Sichuan-Yunnan area and at stations around the epicenter of the Kunlun Mountain Ms 8.1 earthquake.At the same time,the space-time process of deformation field of the Kunlun Mountain Ms8.1 earthquake in this region was analyzed with the principal component analysis(PCA).The conclusion are as follows.The deformation caused by Ms8.1 earthquake is extensive,whose affect is mostly NS displacement.The affected area are mostly in Northwest Sichuan block,specially near its south boundary such as Eryuan faults and Xiaojinhe faults,but,there is almost no effect in mid-Yunnan block.The effect weakens obviously in the north and east areas of Sichuan-Yunnan block.An obvious deformation boundary appears in the east boundaries of Sichuan-Yunnan block,but little deformation difference appeares in its west boundaries(Lancangjiang faults).The deformation caused by Kunlun Mountain strong earthquake probably transfer to the south-east words along the arc shearing tectonic faults,mainly along the east boundaries of Sichuan-Yunnan block.