Abstract：In this paper, the grey correlation index curves of the Xianshuihe fault, Longmenshan fault and the western Qinling mountains tectonic area at or near the boundaries of Bayan Har block are extracted. The section variations of Xianshuihe fault, Longmenshan fault and Tazang fault are calculated from GPS velocity field data during 1999-2007, 2009-2015, 2015-2017. We compare and analyze the common characteristics of the fault activity of the block boundary. The results show that the SE-trending movement acceleration began to appear in the east of Bayan Har block in 2009, and that this high-speed characteristic has been maintained for several years. The occurrence of Wenchuan M8.0 earthquake adjusted the stress-strain state of this area, which supports the occurrence of Lushan and Jiuzhaigou M7.0 earthquakes. On the basis of maintaining high-speed movement and high stress-strain state in the east of Bayan Har block from 2015 to 2017, and then accelerating slightly, the remarkable acceleration of tension observed by cross-fault observation of Xianshuihe fault in the boundary of the block from 2016 to July 2017 is related to the Jiuzhaigou earthquake, which is significant for medium-term background prediction.
ZHANG Xi,QIN Shanlan,HAO Ming et al. Discussion on the Correlation between Cross-Fault Abnormality of the Xianshuihe Fracture and the Jiuzhaigou Earthquake[J]. jgg, 2019, 39(10): 991-996.
