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首页> 外文期刊>Pure and Applied Geophysics >Structure and Significance of S-wave Velocity and Poisson’s Ratio in the Crust beneath the Eastern Side of the Qinghai-Tibet Plateau
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Structure and Significance of S-wave Velocity and Poisson’s Ratio in the Crust beneath the Eastern Side of the Qinghai-Tibet Plateau

机译：青藏高原东侧下方地壳中S波速度和泊松比的结构及其意义

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摘要

The receiver functions of body waves of distant earthquakes obtained for the regions beneath 41 digital stations (Lhasa and GANZ in Tibet, Mandalay and Rangoon in Myanmar, SHIO in India, CHTO in Thailand, and station network in Sichuan and Yunnan) were used to invert for S-wave structure in the crust and upper mantle in Sichuan, Yunnan, and their surrounding areas. Meanwhile the distribution characteristics of the Poisson’s ration and the crustal thickness in Sichuan and Yunnan areas were also obtained. Results indicate that the depth of Moho beneath the eastern side of Qinghai-Tibetan plateau varies strikingly. It is obvious that the greatest changes in crustal thickness occur in a north-south direction. The crustal thickness decreases from north to south, being as thick as 70 km in eastern Tibet, the northern portion of our area of interest, and less than 30 km in Chaing Mai and Rangoon, the southern portion of our area. There are, however, exceptions regarding the trend. The thickness exhibits an east-west variation trend in the area from Ma’erkong-Kongding in Sichuan to Lijiang in Yunnan. In general the Jinpingshan-Longmenshan fault and Anninghe fault can be taken as the boundaries of this exception area. The thickness in Kongding in the west is 68 km, while it is only 39 km in Yongchuan in the east. Moreover the Poisson’s ratio values in the blocks of central Sichuan and Sichuan-Yunnan Diamond are high, and a low velocity layer in the crust of this area can be obviously detected. The distribution characteristics of the high Poisson’s ratio and the low velocity of the crust in this block correspond to the tectonic structure, being in contrast with the surrounding areas. Combining with the distribution features of the modern tectonic stress field, it is deduced that the Sichuan-Yunnan area is probably the channel through which the materials of the lithosphere flow eastward.
机译：利用41个数字台站下方的区域（西藏的拉萨和甘NZ，缅甸的曼德勒和仰光，印度的SHIO，泰国的CHTO以及四川和云南的台网）获得的远震体波的接收器功能进行反演。四川，云南及其周边地区地壳和上地幔中的S波结构。同时获得了四川和云南地区的泊松比分布特征和地壳厚度。结果表明，青藏高原东侧下方的莫霍面深度变化显着。显然，地壳厚度的最大变化发生在南北方向。地壳厚度从北向南减小，在我们所关注地区的北部西藏东部，厚度为70公里，而在我们地区南部的查买和仰光地区，地壳厚度不到30公里。但是，关于趋势也有例外。从四川的玛尔孔-孔顶地区到云南的丽江地区，厚度呈现出东西向的变化趋势。一般来说，金平山—龙门山断裂和安宁河断裂可以作为该异常区的边界。西部孔顶的厚度为68 km，而东部永川的厚度仅为39 km。此外，川中地区和川云南钻石区的泊松比值很高，而且该地区地壳中的低速层很明显。与周围地区形成对比，该区块中高泊松比和地壳低速的分布特征与构造结构相对应。结合现代构造应力场的分布特征，推断川滇地区可能是岩石圈物质向东流动的通道。

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