基于地震各向异性分析郯庐断裂带中段深部构造特征

ANALYSIS ON CHARACTERISTICS OF DEEP STRUCTURES BASED ON SEISMIC ANISOTROPY UNDER MIDDLE PART OF TANLU FAULT ZONE

利用郯庐断裂带中段附近10个宽频带台站的远震波形资料,基于上地幔地震各向异性来分析郯庐断裂带中段深部构造特征。本研究得到,郯庐断裂带中段深部平均快波偏振方向为93.8°,即郯庐断裂带中段深部主张应变(张应力)方向,对照GPS资料和地震资料的研究表明,郯庐断裂带中段地壳和深部上地幔的形变存在总体的一致性,即郯庐断裂带中段岩石层的形变具有统一特征,地壳与深部上地幔处于相似的应力应变状态中。

This study uses teleseismic waveform data recorded in 10 broad-band seismic stations a- round the middle part of Tancheng-Lujiang fault zone, analyzing the characteristics of deep structures under the middle part of Tancheng-Lujiang fault zone based on the seismic anisotropy of the upper mantle. In the study, the fast-wave direction is 93.8~, which is the main tensional strain（ tensile stress） of deep under the middle part of Taneheng-Lujiang fault zone, compared with the GPS data and the study of seismic data , showing that the deformation of the crust and upper mantle under the middle part of Tancheng-Lujiang fault zone is consistent, lithosphere deformation under the middle part of Tancheng-Lujiang fault zone has characteristics of unification, the crust and upper mantle is in a similar state of stress and strain.