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The crustal structure under Sanjiang and its dynamic implications:Revealed by seismic reflection/refraction profile between Zhefang and Binchuan,Yunnan

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Science China Earth sciences 2005年第9期48卷 1329-1336页

作者： zhang zhongjie1, bai zhiming1, wang chunyong2,{3., lü qingtian3. li jiliang1, liu yifeng1 & liu zhenkuan4 1. institute of geology and geophysics, chinese academy of sciences, beijing 100029, China 2. institute of geophysics, China Seismological Bureau, beijing 100085, China 3. institute of Deposition Resource, chinese {13. of Geosciences, beijing 10003., China 4. School of Exploration and Information, China University of Geosciences, beijing 100083. China 1. institute of {1. and {3. Chinese Academy of Sciences 100029 Beijing China 2. institute of {1. China Seismological Bureau 100085 Beijing China 3. institute of Deposition Resource Chinese Academy of Geosciences 100037 Beijing China 4. School of Exploration and Information China University of Geosciences 100083 Beijing China

The fault belts in Sanjiang mainly include Jinshajiang-Honghe fault, lancangjiang fault and Nujiang fault (called Sanjiang faults) in western Yunnan Province, China. By interpreting the wide-angle seismic reflection/refraction profile between Zhefang and Binchuan, which crosses tengchong and Baoshan blocks in Dianxi (western Yunnan) tectonic zone, we recon- struct the crustal structure with seismic traveltime tomography for crustal P-wave velocity and the seismic scattering image for crustal seismic reflection structure. In this paper, we firstly present the crustal structure images of P-wave velocity and seismic reflection under the wide-angle seismic profile. These results demonstrate that, the crustal velocity structure and seismic reflec- tion structure along the profile can be divided into 3.segments, and there is an obvious difference of crustal structure among the eastern, the western and the middle segment. Generally, crustal P-wave velocities in the Baoshan segment are 0.1.0.2 km/s slower and seismic reflection am- p{1.tudes from Moho discontinuity are stronger than the other 2 segments. In the studied area, crustal thickness is about 40 km, and shows the thickening tendency from west to east along the profile. Additionally, it can be seen that there is one strong-amp{1.tude seismic reflection event as bright points at the depths of 8―1. km, along the segment of 80―1.5 km of the profile (south- ward of tengchong); and seismic reflection wave-field from Moho discontinuity varies obviously along the lateral direction. Finally, we make some discussions on the crustal thickening pattern in the Sanjiang fault belt, structural environment of earthquake development and the contact rela- tionship between the tengchong block, Banshan block and luxi trough.

关键词： Sanjiang area wide-angle seismic profile crustal structure.

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