Mapping the upper mantle discontinuities beneath China with teleseismic receiver functions
Mapping the upper mantle discontinuities beneath China with teleseismic receiver functions
复制标题
用远震接收函数绘制中国下方的上地幔不连续面
DOI：
10.1186/bf03352819
复制
发表时间：
2008-08
期刊：
影响因子：
--
通讯作者：
中科院分区：
文献类型：
--
作者：
本文利用中国数字地震台网中心台站记录的地壳体波，对中国大陆上地幔不连续面进行了填图。利用CRUST2.0和各台站下的S-层析成像模型，结合一维追踪方法，将径向接收函数时间序列转换为深度序列。在几乎所有的观测站都可以看到与410和660公里不连续面（“410”和“660”）相对应的清晰信号。研究区下方的“410”的平均S速度对比度接近全球平均值，而“660”的平均S速度对比度小于全球平均值。“410”的平均深度为413 km，峰间地形约为36 km，具有与中国北方大同第四纪火山相关的区域性凹陷。"660“地形峰-峰变化约43 km，平均深度669 km，东北、东南和北方的”660“洼地与太平洋和菲律宾海的俯冲作用有很好的对应关系。过渡区的宽度在具有较深的“660”的区域中也增加。我们的研究结果似乎表明，可能有一个低速层低于深度约600公里，可能是积累的石榴石层的古地壳以上的“660”。
We used teleseismic body waves recorded at stations of the Chinese Center of Digital Seismic Network to map the upper mantle discontinuities beneath continental China. The CRUST2.0 and anS-tomography model beneath each station were combined with the one-dimensional tracing method to convert time series of radial receiver functions to depth series. Clear signatures corresponding to the 410- and 660-km discontinuities (‘410’ and ‘660’) are visible at almost all of the stations. The averageSvelocity contrast of ‘410’ beneath the study area is close to the global average, but that for ‘660’ is smaller than the global average. The average depth of ‘410’ is 413 km, and the peak-to-peak topography is about 36 km, with regional depressions that correlate with the Datong quaternary volcano in northern China. The ‘660’ topography exhibits a peak-to-peak variation of about 43 km, and its average depth is 669 km; the depressions of the ‘660’ in northeastern, southeastern and northern China are well correlated with the past subduction around the Pacific Ocean and Philippine Sea. The width of the transition zone is also increased in the region with the deeper ‘660’. Our results would appear to indicate that there may be a low-velocity layer below a depth of approximately 600 km that may be the accumulated garnetite layer of an ancient crust above the ‘660’.
登录
查看更多内容
影响因子：
2.8
作者：
KENNETT, BLN;ENGDAHL, ER
通讯作者：
ENGDAHL, ER
影响因子：
5.3
作者：
X. Li;S. Sobolev;R. Kind;X. Yuan;C. Estabrook
通讯作者：
X. Li;S. Sobolev;R. Kind;X. Yuan;C. Estabrook
影响因子：
--
作者：
X. Yuan;J. Ni;R. Kind;J. Mechie;E. Sandvol
通讯作者：
X. Yuan;J. Ni;R. Kind;J. Mechie;E. Sandvol
影响因子：
--
作者：
S. Lebedev;G. Nolet
通讯作者：
S. Lebedev;G. Nolet
DOI：
10.1002/cjg2.198
发表时间：
2001-11
期刊：
Chinese Journal of Geophysics
影响因子：
--
作者：
Yi Yang;Hui-lan Zhou
通讯作者：
Yi Yang;Hui-lan Zhou