Crustal thickness and Poisson's ratio in southwest China based on data from dense seismic arrays
Crustal thickness and Poisson's ratio in southwest China based on data from dense seismic arrays
复制标题
基于密集地震台阵数据的中国西南地区地壳厚度和泊松比
DOI：
10.1002/2017jb013978
复制
发表时间：
2017-09
期刊：
影响因子：
--
通讯作者：
Cai Yan
中科院分区：
文献类型：
--
作者：
Wang Weilai;Wu JianPing;Fang LiHua;Lai Guijuan;Cai Yan
地壳厚度和泊松比是表征区域均衡状态和物质组成或状态的重要参数。利用西南地区141个常设台站和785个临时台站的远震波形资料，通过接收函数的H‐κ叠加，得到了地壳厚度和平均泊松比。在东北（扬子克拉通北部），相关系数较低，表明区域均衡需要考虑岩石圈的影响。攀枝花—峨眉山北部地区的泊松比为中间值（0.26≤σ≤0.28）。结合前人研究的高速特征，推测其可能与峨眉山大火成岩省有关。高泊松比（σ > 0）结合前人研究的低速带，我们推测可能存在部分熔融和下地壳流动。
Crustal thickness and Poisson's ratio are important parameters to characterize regional isostasy state and material composition or state. Using the teleseismic waveform data from 141 permanent stations and 785 temporary stations in southwest China, we obtain the crustal thickness and average Poisson's ratio by the H‐κ stacking of receiver functions. In the west (the SE Tibetan Plateau and the Yunnan‐Burma‐Thailand block) and southeast (the Cathaysian block and southern Yangtze craton) of the study region, there are high correlation coefficients for the crustal thicknesses between what we obtain from the receiver functions and what we calculate from the Airy isostasy model, indicating that a state of isostasy can be achieved at the crust‐mantle boundary beneath these two regions. In the northeast (northern Yangtze craton), the correlation coefficient is lower, indicating that the effect of the lithosphere needs to be considered for a regional isostasy. Intermediate Poisson's ratios (0.26 ≤ σ ≤ 0.28) are found beneath the northern Panzhihua‐Emeishan region. Combing the high‐velocity features from previous study, we speculate that it may be related to the Emeishan large igneous province. High Poisson's ratios (σ > 0.28) are found beneath the SE Tibetan Plateau and the nearby strike‐slip faults, such as the Anninghe‐Zemuhe fault and the northern Xiaojiang fault. Combing the low‐velocity zones from previous study, we speculate that there may be partially melted and lower crustal flow.
登录
查看更多内容
西藏东南部下方的 P 波层析图像：2008 年汶川地震机制研究
DOI：
10.1007/s11430-010-4037-5
发表时间：
2010-09
期刊：
Science China Earth Sciences
影响因子：
--
作者：
Wei Wei;Sun RuoMei;Shi YaoLin
通讯作者：
Shi YaoLin
DOI：
10.1002/cjg2.20014
发表时间：
2013-03
期刊：
Chinese Journal of Geophysics
影响因子：
--
作者：
Cao Ling-min;Yi Xu;Wu Shiguo
通讯作者：
Cao Ling-min;Yi Xu;Wu Shiguo
影响因子：
--
作者：
Chuansong He;Chun-yong Wang;Jianping Wu
通讯作者：
Chuansong He;Chun-yong Wang;Jianping Wu
从局地和远震资料看西南地区腾冲板内火山成因及地震构造
影响因子：
3.9
作者：
Lei, Jianshe;Su, Youjin;Zhao, Dapeng
通讯作者：
Zhao, Dapeng
影响因子：
2.9
作者：
Youxue Wang;W. Mooney;Xuecheng Yuan;N. Okaya
通讯作者：
Youxue Wang;W. Mooney;Xuecheng Yuan;N. Okaya