Lithospheric structure of the Tien Shan region constrained by joint inversion of receiver function and Rayleigh wave dispersion
Lithospheric structure of the Tien Shan region constrained by joint inversion of receiver function and Rayleigh wave dispersion
复制标题
接收函数与瑞利波色散联合反演约束的天山地区岩石圈结构
DOI：
10.1111/ter.12389
复制
发表时间：
2019
期刊：
影响因子：
2.4
通讯作者：
Hua Yujin
中科院分区：
文献类型：
--
作者：
Li Mengkui;Lin Xu;Wu Tengfei;Hua Yujin
通过对天山造山带61个宽带地震台站的瑞利波群速度和瑞利P波接收函数的联合反演，得到了天山造山带岩石圈剪切波速度模型。我们的新模型揭示了地壳和上地幔中剪切波速度的显著横向变化。该模型揭示了横跨塔拉斯费尔干纳断裂的中、上地壳的不同构造，这可能表明在断裂之下天山西部和中部之间存在构造边界。根据速度图像，断层的深度范围为~40 km，且仅限于地壳。在天山南部和中部的中地壳和上地幔中成像了明显的低速异常，这意味着上地幔物质的上涌可能在造山运动中发挥了重要作用。
We obtain a lithospheric shear‐wave velocity model across the Tien Shan orogenic belt by jointly inverting Rayleigh wave group velocities and teleseismic P‐wave receiver functions at 61 broadband seismic stations deployed in this region. Our new model reveals prominent lateral variations of shear‐wave velocity in both the crust and uppermost mantle. This model reveals different structures in the upper and middle crust across the Talas Fergana Fault, which may suggest the presence of a tectonic boundary between the western and central Tien Shan beneath the fault. According to the velocity images, the depth extent of the fault is ~40 km and this is confined to the crust. Pronounced low‐velocity anomalies are imaged in the middle crust and uppermost mantle beneath the southern and middle Tien Shan, implying that the upwelling of the materials from the upper mantle could have played an important role in the mountain building.