| Crustal structure beneath the Songpan——Garze orogenic belt |
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| 引用本文： | 王椿镛,韩渭宾,吴建平,楼海,白志明.Crustal structure beneath the Songpan——Garze orogenic belt[J].地震学报(英文版),2003(3). |
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| 作者姓名： | 王椿镛 韩渭宾 吴建平 楼海 白志明 |
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| 作者单位： | Institute of Geophysics，China Seismological Bureau，Beijing 100081，Chian，Seismological Bureau of Sichuan Province，Chengdu 610041，China，Institute of Geophysicy，China Seismological Bureau，Beijing 100081，China，Institute of Geophysics，China Seismological Bureau，Beijing 100081，China，Institute of Geophysics，China Seismological Bureau，Beijing 100081，China |
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| 基金项目： | National Key Research Development Project (No. G1998 040700/sub-project 95-13-02-03). |
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| 摘 要： | AbstractThe Benzilan-Tangke deep seismic sounding profile in the western Sichuan region passes through the Song-pan-Garze orogenic belt with trend of NNE.Based on the travel times and the related amplitudes of phases in therecord sections,the 2-D P-wave crustal structure was ascertained in this paper. The velocity structure has quitestrong lateral variation along the profile.The crust is divided into 5 layers,where the first,second and third layerbelong to the upper crust,the forth and fifth layer belong to the lower crust.The low velocity anomaly zone gener-ally exists in the central part of the upper crust on the profile,and it integrates into the overlying low velocitybasement in the area to the north of Ma’erkang.The crustal structure in the section can be divided into 4 parts:inthe south of Garze-Litang fault,between Garze-Litang fault and Xiashuihe fault,between Xianshuihe fault andLongriba fault and in the north of Longriba fault,which are basically coincided with the regional tectonics division
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