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S-wave velocity and Poisson's ratio structure of crust in yunnan and its implication

Science china Earth Sciences 2005年第2期48卷 210-218页

作者： hu jiafu, su youjin, zhu xiongguan & chen yun geophysical department of yunnan university, kunming 650091, china Seismological Bureau of yunnan Province, kunming 650041, china Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100101, china 1. geophysical department of yunnan university 650091 Kunming China 2. Seismological Bureau of yunnan Province 650041 Kunming China 3. Institute of Geology and Geophysics Chinese Academy of Sciences 100101 Beijing China

Receiver function of body wave under the 23 stations in yunnan was extracted from 3-component broadband digital recording of teleseismic event. Thus, the S-wave velocity structure and distribution characteristics of Poisson's ratio in crust of yunnan are obtained by inversion. The results show that the crustal thickness is gradually thinned from north to south. The crustal thickness in Zhongdian of northwest reaches as many as 62.0 km and the one in Jinghong of further south end is only 30.2 km. What should be especially noted is that there exists a Moho upheaval running in NS in the Chuxiong region and a Moho concave is generally parallel to it in Dongchuan. In addition, there exists an obvious transversal inhomogeneity for the S-wave velocity structure in upper mantle and crust in the yunnan region. The low velocity layer exists not only in 10.0-15.0 km in upper crust in some regions, but also in 30.0-40.0 km in lower crust. Generally, the Poisson's ratio is on the high side, however it has a better corresponding relation to the crustal velocity structure. An obvious block distribution feature is still shown on such a high background of Poisson's ratio. It is discovered by synthetically analyzing the velocity structure and Poisson's ratio distribution that there are high Poisson's ratio and complicated crust-mantle velocity structure feature in the Sichuan-yunnan Diamond Block with Xiaojiang fault to be the east boundary and Yulong Snow Mountain fault to be the west boundary besides the frequent seismicity. This feature differs obviously from that of surrounding areas, which would provide geophysical evidence to deeply study the eastwardly flowage of lithospheric substances in the Qinghai-Tibet Plateau.

关键词： yunnan, S-wave velocity, Poisson's ratio, Sichuan-yunnan Diamond Block.

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