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Upper mantle shear wave velocity structure of the east Anatolian-Caucasus regionUpper mantle shear wave velocity structure of the east Anatolian-Caucasus region

机译：东安托利亚 - 高加索地区的上部地幔剪力波速结构东安托利亚高加索地区的上部地幔剪力波速结构

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In the present dissertation, I describe two studies of the regional upper mantle shear wave velocity structure. In order to derive the absolute velocity structure of the upper mantle, I have applied surface wave tomography to model Rayleigh wave phase velocities as a function of period. Then I inverted the Rayleigh phase velocities to obtain shear wave velocities as a function of depth. The resulted high-resolution 3-D shear wave velocity model of the regional upper mantle is characterized by a better depth resolution than any preexisting tomographic models. I also conducted a shear wave splitting analysis using traditional methods and developed a two-layer grid search algorithm in order to infer the upper mantle anisotropic structure. The results of the shear wave splitting analysis for the stations located in Azerbaijan are the first in the region. My 3-D velocity model shows the depth extent of the asthenospheric layer beneath the Turkish and Iranian Plateaus, which does not exceed 200 km and therefore rejects any suggestions of the existence of deep mantle plums in the area. The deep high velocity bodies beneath the Black Sea and northern Iranian Plateau are identified as the remnant slabs of the northern and southern brbranchesf the Neo-Tethys lithosphere. The widespread volcanism and the uplift within the plateau were the result of a gradual steepening of the subducting slab of the southern branch of Neo-Tethys. The shear wave splitting analysis shows evidence of the two-layer anisotropic structure beneath the eastern Caucasus region. The results presented in the dissertation are crucial for the regional seismic hazard analysis.
机译：在本文中，我描述了关于区域上部地幔剪力波速度结构的两项研究。为了导出上部地幔的绝对速度结构，我已经施加了表面波断层扫描，以模拟瑞利波阶段速度作为时段的函数。然后我倒置瑞利阶段速度以获得作为深度的函数的剪切波速度。由此产生的高分辨率3-D剪切波速度模型的特征在于比任何预先存在的断层模型更好的深度分辨率。我还使用传统方法进行了剪力波分裂分析，并开发了双层网格搜索算法，以推断上部地幔各向异性结构。位于阿塞拜疆的站的剪力波分裂分析的结果是该地区的第一个。我的3-D速度模型显示了土耳其语和伊朗平原下方的哮喘层的深度范围，不超过200公里，因此拒绝该地区深层地幔李子存在的任何建议。黑海和北伊朗高原下面的深速度体被确定为北部和南部的南部和南部的近年岩石岩石圈的残余板。普遍存在的火山主义和高原内的隆起是Neo-Thethys南部分支逐渐陡峭的结果。剪切波分裂分析显示了东部高加索地区下面的双层各向异性结构的证据。本文提出的结果对于区域地震危害分析至关重要。

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