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首页> 外文期刊>Journal of Asian earth sciences >Shear-wave splitting in the Rajasthan craton, India
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Shear-wave splitting in the Rajasthan craton, India

机译：印度拉贾斯坦克拉通的剪切波分裂

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The shear-wave splitting parameters (i.e. fast axes orientation (Psi) and delay time (delta t)) are measured at four broadband stations in Rajasthan, using SKS/SKKS core phases from three-component broadband waveforms of 30 events recorded during 2014-16. The thicknesses of lithosphere at these four stations are also inferred from the estimated delays. The average splitting parameters (Psi, delta t) at the northern-most (JAI) and southern-most (BAN) stations are modeled to be 36.44 degrees +/- 08.36 degrees and 1.48 +/- 0.32 s, and 35.72* +/- 10.47 degrees and 1.86 +/- 0.34 s, respectively. While these parameters at UDI and BUN stations are found to be 41.08 degrees +/- 08.54 degrees and 1.61 +/- 0.26 s, and 43.86 degrees +/- 08.96 degrees and 1.68 +/- 0.27 s, respectively. Thus, our modeling reveals a mean fast axes orientation of (39 degrees +/- 9 degrees) with a mean delay of 1.7 +/- 0.3 s, for Rajasthan, which could be attributed to the frozen lithospheric anisotropy in the direction of current absolute plate motion of the Indian plate. A slight regional variation of observed orientation of fast axes ranging from 35.7 degrees(at BAN) to 43.9 degrees (at BUN)could be attributed to the tectonic control rather than current plate motion. In addition, the mean orientations of fast axes are measured to be 36.4 degrees at UDI and 41.1 degrees at JAI, respectively. Thus, this observed coherent variation of fast axes orientation across the Rajasthan suggests a significant contribution from the asthenospheric flow. Further, estimated mean delay time (1.7 +/- 0.3 s) does also suggest a contribution from the anisotropy associated with asthenospheric flows. The maximum delay (similar to 1.86 s) is estimated at southernmost BAN station, suggesting a thick anisotropic layer of similar to 214 km, while minimum delay (similar to 1.48 s) is modeled at northernmost JAI station, suggesting a 170-km thick anisotropic layer. While asthenospheric layer thicknesses at UDI and BUN are found to be 185 and 193 km, respectively. This observation suggests a relatively more anisotropic and thick lithosphere in the south in comparison to that in the north. The measured deviation of fast axis orientation from the absolute Indian plate motion varies from 1 to 4.3 degrees, which could be related to the changes in asthenosphric flow pattern due to the presence of topography at the base of lithosphere.
机译：使用SKS / SKKS核心相位从2014年期间记录的30个事件的三分量宽带波形中测量SKS / SKKS核心相位，在拉贾斯坦邦的四个宽带站测量了剪切波分裂参数（即快轴方向（Psi）和延迟时间（delta t））。 16。从估计的延迟也可以推断出这四个站的岩石圈厚度。最北端（JAI）和最南端（BAN）站的平均分裂参数（Psi，delta t）建模为36.44度+/- 08.36度和1.48 +/- 0.32 s，以及35.72 * + / -分别为10.47度和1.86 +/- 0.34 s。虽然在UDI和BUN站的这些参数分别为41.08度+/- 08.54度和1.61 +/- 0.26 s，以及43.86度+/- 08.96度和1.68 +/- 0.27 s。因此，我们的模型揭示了拉贾斯坦邦的平均快轴方向（39度+/- 9度），平均延迟为1.7 +/- 0.3 s，这可以归因于当前绝对方向上的冻结岩石圈各向异性板块的板块运动。快轴观测方向的轻微区域变化范围从35.7度（在BAN处）到43.9度（在BUN处）可能归因于构造控制，而不是当前板块运动。另外，快轴的平均方向在UDI处测量为36.4度，在JAI处测量为41.1度。因此，在拉贾斯坦邦观察到的快速轴方向的连贯变化表明，软流圈的流动有重要贡献。此外，估计的平均延迟时间（1.7 +/- 0.3 s）的确也暗示了与软流圈流量相关的各向异性的贡献。在最南端的BAN站估计了最大延迟（约1.86 s），表明有一个厚约214 km的各向异性层，而在最北的JAI站模拟了最小延迟（约1.48 s），表明有170 km的各向异性层。虽然发现UDI和BUN的软流圈层厚度分别为185 km和193 km。该观察结果表明，与北部相比，南部岩石圈的各向异性和厚度相对较高。快速轴定向与绝对印度板块运动的测量偏差在1到4.3度之间变化，这可能与岩石圈底部存在地形导致的软弱性流型变化有关。

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