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《Chinese Journal of Geophysics》 1986-02
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EXPLOSION INVESTIGATION OF THE CRUSTAL STRUCTURE IN WESTERN YUNNAN PROVINCE

Hu HONG-XIANG LU HAN-XING WANG CHUN-YONG HE ZHENG-QIN ZHU LIANG-BAO(Institute of Geophysics, State Seismological Bureau, Beijing) YAN QI-ZHONG FAN YUE-XIN ZHANG GUO-QING DENG YING-E (Seismological Bureau of Yunnan Province, Kunming)  
In this paper are presented the results of explosion investigation of the crustal structure of Eryuan to Jiangchuan and Zhefang to Binchuan profiles in Western Yunnan Province.There are four interfaces in the crust of this region. As the results of interpretation show, these are Pg, P2°, P3° and P4° interfaces. The Pg phase corresponds to refraction of the top boundary of the crystalline basement. Its depth is 0.3 to 3.5 km with wave velocity 5.90 km/s. The P2° is reflection from the interface in the upper crust. Great changes of its depth from 11 to 25 km occur here, and the velocity of its head wave is from 6.30 to 6.50 km/s. At the eastern part of Eryuan-Jiangchuan profile there is probably a thin layer with high velocity. There are thick gradient layers in most part of this region under P2° interface. They are continuously extending to Moho boundary. Here is a weak reflection P3° in parts of the region at the depths 30 to 35 km. The depth of Moho discontinuity (P4° boundary) is 37 to 45 km. It generally slopes from south to north in Zhefang-Binchuan profile. The average velocity of crust is about 6.40 km/s with velocity of Pn 8.06 km/s. But the Moho discontinuity does not evidently slope in Eryuan-Jiangchuan prifile. The average velocity of crust here is 6.19 km/s, and the velocity of Pn is 7.75 km/s in the middle part of this profile. Another reflection interface P5° exists under the Moho boundary at the depth 50 km.There is a vertical depth displacement of 2.5 km of Moho and P2° interface near the Nu Jiang fault in Zhefang-Binchuan profile and its northern side is deeper than the southern one. The correlation of seismic phase P4° is interrupted and its waveform is distorted at that place where the Lancang Jiang fault passed nearby. Perhaps here is some kind of broken zone in the lower crustal interior. These pictures also occur clearly at three places in the Eryuan-Jiangchuan profile. Especially, it is quite evident at the Yuanmou-Luzhijiang fault. The vertical displacement of Moho interface here is 3 km, and the fault causes correlation of P4° phase from shot point in Jiangchuan interrupted.At the middle part of Eryuan-Jiangchuan profile the anomalous low velocity region with value 7.75 km/s at the top of upper mantle is revealed.
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