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首页> 外文期刊>Research in Geophysics >Double layer anisotropy beneath the New Madrid seismic zone and adjacent areas: insights from teleseismic shear wave splitting
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Double layer anisotropy beneath the New Madrid seismic zone and adjacent areas: insights from teleseismic shear wave splitting

机译：新马德里地震带及其附近地区的双层各向异性：远震剪切波分裂的见解

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摘要

A total of 93 well-defined PKS, 54 SKKS, and 126 SKS shear-wave splitting parameters are determined at 25 broadband seismic stations in an approximately 1000 by 1000 km 2 area centered at the New Madrid seismic zone (NMSZ) in order to test the existence of two anisotropic layers and to map the direction and strength of mantle fabrics. The individual splitting parameters suggest a significant and systematic spatial and azimuthal variation in the splitting parameters. The azimuthal variations at most stations can be explained as the results of present SW ward asthenospheric flow and NNE trending lithospheric fabrics formed during past orogenic events. In the NMSZ, rift-parallel fast directions (potentially related to a long-rift flow) and rift-orthogonal fast directions from small-scale mantle convection are not observed. In addition, reduction in splitting times as a result of vertical asthenospheric flow is not observed.
机译：在以新马德里地震带（NMSZ）为中心的约1000 x 1000 km 2区域的25个宽带地震台站中，确定了总共93个定义明确的PKS，54个SKKS和126个SKS剪切波分裂参数。两个各向异性层的存在，并绘制出套布的方向和强度。各个分割参数表明分割参数存在显着且系统的空间和方位变化。大多数台站的方位角变化可以解释为目前西南偏软流圈流和过去造山活动期间形成的北非趋势岩石圈结构的结果。在NMSZ中，未观察到小尺度地幔对流产生的裂谷平行快速方向（可能与长裂谷流动有关）和裂谷正交快速方向。另外，没有观察到由于垂直的软流圈流动而导致的分裂时间的减少。

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