Slip Rates of the Major Faults on the Mid-southern Section of the North-South Seismic Belt Calculated from the Block Theory  

作　　者：Yan Wei Wu Yanqiang Niu Anfu Li Xiaofan Zhang Lingkong Ji Ping 

机构地区：[1]China Earthquake Networks Center [2]Institute of Earthquake Science,China Earthquake Administration

出　　处：《Earthquake Research in China》2014年第1期62-72,共11页中国地震研究（英文版）

基　　金：jointly sponsored by the National Key Technology R&D Program of the 12th "Five-year Plan" of PRC(2012BAK19B02);the Special Fund for Earthquake-related Scientific Research of China Earthquake Administration(201108009);the Youth Earthquake Regime Tracing Project for 2012(2012020212)

摘　　要：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 rag.e and strike-slip rate： the tensional slip rate （ 8. lmm^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-ghimian 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^-1 on 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 ~ 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.

关 键 词：Block model Slip rate North-South Seismic Belt Model applicabilityevaluation 

分 类 号：P315[天文地球—地震学]