Crust anisotropy of Taihangshan mountain range in north China inferred from receiver functions
Crust anisotropy of Taihangshan mountain range in north China inferred from receiver functions
复制标题
DOI：
--
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Tian;Li;Wm Wang;Zhao;Yao;Zx
中科院分区：
文献类型：
--
作者：
Tian;Li;Wm Wang;Zhao;Yao;Zx
我们研究了具有任意方向的六角对称各向异性的水平层状介质中的接收函数，并讨论了各向异性介质中的剪切波分裂和能量偏差现象。各向异性结构在径向和横向分量上产生了接收函数幅度和到达时间的模式，这是源-接收器后向方位角的系统函数。我们还研究了不同各向异性参数的影响，例如对称性的趋势和下降将各向异性接收函数方法应用于华北太行山(TMR)的JJJX站，结果表明，上地壳(0~2.4 km)具有约10%的各向异性，且对称轴较慢，可能是由排列微裂缝引起的，对称轴的走向与断层分布有很好的相关性。该区中地壳(2.4~22 km)具有快对称轴,具有约8%的各向异性,与排列晶体有关,这可能是新生代TMR抬升的结果。
We investigated the receiver functions in a horizontally-layered medium with arbitrary oriented hexagonally symmetric anisotropy,and discussed the phenomenon of shear-wave splitting and energy deviation in an anisotropic medium.The anisotropic structure yields patterns of receiver function amplitudes and arrival times on both the radial and transverse components that are a systematic function of source-receiver back azimuth.We also investigated the influence of varying anisotropy parameters,e.g.trend and plunge of the symmetry axis,and depth distribution of anisotropy,on the variation pattern.We applied the method of receiver function with anisotropy to one station-JJJX,which is located in the Taihangshan Mountain Range(TMR)of North China.Our results show that the upper crust(0~2.4 km)has about 10% anisotropy with a slow symmetry axis,which might be caused by aligned microcracks.The trend direction of the symmetry axis has a good correlation with the faults distributed in this area.With a fast symmetry axis,the middle crust(2.4~22 km)has about 8% anisotropy associated with aligned crystals,which might be a result of the uplifting of the TMR occurred in Cenozoic.