Chuan-Dian block is one of the most active crustal movement areas in China, with special structure and complex boundary condition. Chuan-Dian block is surrounded with Xian-Shui-He fault、An-Ning-He fault、Ze-Mu-He fault、Xiao-Jiang fault、Hong-He fault and Jin-Sha-Jiang fault which have intense tectonic activity at nowadays. The unique geological structure of Chuan-Dian block is worth studying and the precision GPS monitor of Crustal Movement Observation Network in China can provides a quantitative basis. The development status and basic principle of GPS positioning are introduced, including space segment, ground control segment and user part. The GPS positioning errors is systematic analysised, the specific model and a variety of other error correction measures to reduce or eliminate the errors is proposed. The GAMIT/GLOBK software which are used to process GPS monitor data is also simply introduced. Take advantage of the observational data during 1999 to 2006 of the Crustal Movement Observation Network of China, the horizontal movement velocity on the Eurasian reference frame of 151 stations of the Crustal Movement Observation Network of China in the Chuan-Dian block and its adjacent areas is calculated. Movement direction of observational stations in the Chuan-Dian block and its adjacent areas are analysised, then the result that the Chuan-Dian block and its adjacent areas done clockwise rotation center on the eastern Himalayan node, and the Chuan-Dian block north-south direction exists obvious squeeze and the east-west direction exists extension is obtained. Using least-squares fitting, it is obtained that movement velocity and direction of Chuan-Dian block、Chuan-Northwest block and Dian-Middle block respectively. Through studying both sides GPS monitoring results of Xian-Shui-He fault、An-Ning-He fault、Ze-Mu-He fault、Xiao-Jiang fault、Hong-He fault and Jin-Sha-Jiang fault respectively, six faults movement speed and fault properties is obtained. The time series of coordinates at Kunming fiducial station is fitting by using the linear model. The non-linear part of the time series showed that the east-west and south-north coordinates’ time series hasn’t obvious periodic variation, elevation direction coordinates’ time series has annual period variation. Pole Tide and atmospheric pressure lead to the displacement of the Kunming station. The relationship between the time that Kunming fiducial station horizontal accelerated movement and the time that surrounding areas in Yunnan occur in earthquake is researched. The conclusion is drawn that Kunming fiducial station horizontal direction to appear apparent phenomenon of accelerated movement before surrounding areas in Yunnan occur in a major earthquake.
修改评论