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首页> 外文期刊>Physics of the Earth and Planetary Interiors: A Journal Devoted to Obsevational and Experimerntal Studies of the Chemistry and Physics of Planetary Interiors and Their Theoretical Interpretation >Shear wave anisotropy of the Godavari rift in the south Indian shield: Rift signature or APM related strain?
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Shear wave anisotropy of the Godavari rift in the south Indian shield: Rift signature or APM related strain?

机译：印度南部盾构中戈达瓦里裂谷的剪切波各向异性：裂谷特征还是与APM有关的应变？

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摘要

Shear wave splitting analysis using SKS, SKKS and S waveforms recorded at eight broadband seismic stations within and in the vicinity of the Proterozoic Godavari rift system in the south Indian shield yielded 104 new measurements of azimuthal anisotropy. Our results reveal that the delay times lie between 0.70 and 1.20. s, similar to the previous measurements from the Indian shield. The orientations of fast polarization directions at most of the stations within and beyond the rift are generally aligned orthogonal to the rift axis, consistent with asthenospheric flow in the extension direction. Absence of clear evidences for a preferentially thinner lithosphere beneath the Godavari rift or anomalously high heat flow values coupled with the fact that the NE oriented fast polarization directions are also close to the APM direction of the Indian plate, result in an ambiguity in interpreting the results as being due to strain related to plate motion or signatures of rifting. A thin lithosphere beneath the rift suggests that the source of anisotropy is likely to be in the asthenosphere. In such a scenario, either the mechanism of (1) active rifting where the asthenospheric flow drives the rifting or (2) passive rifting where mantle flow responds to lithospheric thinning caused by far field stresses or (3) present day APM related strain appear to be the plausible mechanisms for forging the observed anisotropy.
机译：利用在南印度盾构的元古代戈达瓦里裂谷系统内及附近的八个宽带地震台站记录的SKS，SKKS和S波形进行的剪切波分裂分析，获得了104个方位各向异性的新测量值。我们的结果表明，延迟时间在0.70至1.20之间。 s，类似于印度盾的先前测量值。在裂谷内外的大多数测站中，快速极化方向的取向通常与裂谷轴正交，与流延方向上的软流圈流一致。缺乏明确的证据来证明戈达瓦里裂谷以下的岩石圈较薄，或异常高的热流值，以及东北向的快速极化方向也接近印度板块的APM方向这一事实，导致在解释结果时含糊不清因为与板块运动或裂痕有关的应变。裂谷下方的岩石圈很薄，表明各向异性的来源很可能在软流圈。在这种情况下，要么是（1）虚流层流驱动裂谷的主动裂谷作用的机制，要么是（2）地幔流对远场应力引起的岩石圈变薄做出反应的被动裂谷的机理，或者（3）当今APM相关应变是建立观察到的各向异性的合理机制。

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