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首页> 外文期刊>Journal of geodynamics >Evidence of multifaceted SKS/SKKS splitting directions in the Sikkim Himalaya, India
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Evidence of multifaceted SKS/SKKS splitting directions in the Sikkim Himalaya, India

机译：印度锡金喜马拉雅山上多面SKS / SKKS分裂方向的证据

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We have investigated the anisotropy strength and fast-axis orientation using an SKS/SKKS splitting technique of seismic phases at Sikkim Himalaya, which is a seismically active zone situated in the central portion of the Great Himalyan Arc in the Indian region. This region lies between two major plate boundary faults, the Main Central Thrust (MCT) and the Main Boundary Thrust (MBT) at its north and south respectively, along with a few regional lineaments. In this study we deployed eight broadband seismic stations and acquired two years of tele-seismic earthquake data, from which we derived 66 good quality anisotropic measurements. In general, the splitting results from both the SKS and SKKS phases show a complex pattern of fast-axis orientation along the northern periphery of the MCT. However, at the central part of the Sikkim between the MBT and the MCT, both results are consistent with the upper mantle deformation of the Indian Plate. We also observed that the anisotropic strength varies between 0.6 s to 3 s and is skewed towards higher anisotropy with orthogonal polarization, which indicate the presence of a two-layer anisotropy. Results of the modelling of 66 anisotropic measurements indicate that the bottom-layer fast-axis orientations are towards N18 degrees E with higher anisotropic strength of partial derivative t = 1.3 s, which elucidates the pristine nature of the upper mantle deformation as a result of asthenospheric flow. But the tectonic deformation of the upper mantle within the lithosphere is prominently observed in the top layer, where the fast axis orientations are towards N48 degrees E with lower anisotropic strength of partial derivative t = 0.6 s.
机译：我们使用锡金喜马拉雅山的地震相的SKS / SKKS分裂技术研究了各向异性强度和快轴方向，锡金喜马拉雅山是位于印度大喜马拉雅弧线中部的地震活跃带。该区域位于两个主要板块边界断层之间，分别位于其北部和南部的主要中央逆冲断层（MCT）和主要边界逆冲断层（MBT），以及一些区域性构造。在这项研究中，我们部署了8个宽带地震台站，并获得了两年的远程地震数据，从中我们得出了66个高质量的各向异性测量结果。通常，SKS和SKKS阶段的分裂结果都显示出沿着MCT北缘的快速轴方向的复杂模式。然而，在MBT和MCT之间锡金的中央部分，这两个结果都与印第安板块的上地幔变形一致。我们还观察到，各向异性强度在0.6 s至3 s之间变化，并且偏向于具有正交极化的更高各向异性，这表明存在两层各向异性。 66次各向异性测量的建模结果表明，底层快轴取向朝N18度E，偏导数的各向异性强度较高，t = 1.3 s，这说明了软流圈上地幔变形的原始性质流。但是，在顶层明显观察到岩石圈内上地幔的构造变形，其中快速轴方向朝N48度E，偏导数较低，各向异性强度t = 0.6 s。

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