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In this paper,using the 1999 ~ 2007 GPS velocity field data,and by choosing the optimal block model,we obtained the deformation models applicable to the boundary zones of major blocks and the slip rates of block boundary faults on the mid-southern segment of the North-South Seismic Belt. The results show that: on the Longmenshan fault zone,the tensional and compressive slip rate is small on the Baoxing-Wenchuan segment,about 0. 5 ~ 1. 8mm·a- 1, and the rate is relatively significant on the segment of the Wenchuan-Maoxian,as 1. 8 ~ 3. 8mm·a- 1; on the Xianshuihe fault belt,there is a certain difference in spatial distribution between the tensional slip rate and strike-slip rate: the tensional slip rate( 8. 1mm·a- 1) is bigger than the sinistral strike-slip rate( 4. 8mm·a- 1) at the north of the Luhuo region; the tension and compression slip rate is basically the same as the strike-slip rate at Luhuo-Dawu; the Dawu-Kangding section presents a trend of decreased strike-slip rate and increased tensional slip rate; the Kangding-Shimian segment shows a strike-slip nature; the strike-slip rate is significantly greater than the tension /compression rate on the Xiaojiang fault zone; the slip rate on the Red River fault zone shows obvious spatial segmentation,the slip rate is smaller in its northwest part,but with a certain amount of tensional /compression component,4. 7mm·a- 1on the Jingdong segment. The segment east of Jingdong( western Gejiu) is mainly of strike-slip,with a slip rate of 4. 5mm·a- 1.
In this paper, using the 1999-2007 GPS velocity field data, and by choosing the optimal block model, we obtained the deformation models applicable to the boundary zones of major blocks and the slip rates of block boundary faults on the mid-southern segment of the North-South Seismic Belt. The results show that: on the Longmenshan fault zone, the tensional and compressive slip rate is small on the Baoxing-Wenchuan segment, about 0.5 to 1.8 mm · a-1, and the rate is relatively significant on the segment of the Wenchuan-Maoxian, as 1. 8-3.8 mm · a-1; on the Xianshuihe fault belt, there is a certain difference in spatial distribution between the tensional slip rate and strike-slip rate: the The tension and compression slip rate are basically the same as the tensional slip rate (8. 1mm · a-1) is bigger than the sinistral strike-slip rate (4. 8mm · a- 1) at the north of the Luhuo region; strike-slip rate at Luhuo-Dawu; the Dawu-Kangding section presents a trend of decreased strike-slip rate and i the Kangding-Shimian segment shows a strike-slip nature; the strike-slip rate is significantly greater than the tension / compression rate on the Xiaojiang fault zone; the slip rate on the Red River fault zone shows obvious spatial segmentation , the slip rate is smaller in its northwest part, but with a certain amount of tensional / compression component, 4. 7mm · a- 1on the Jingdong segment. The segment east of Jingdong (western Gejiu) is mainly of strike-slip, with a slip rate of 4. 5mm · a- 1.