首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >Subducting continental lower crust and crustal thickness variations in the intermediate seismic zone of Pamir–Hindu Kush inferred from Moho underside reflection pmP
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Subducting continental lower crust and crustal thickness variations in the intermediate seismic zone of Pamir–Hindu Kush inferred from Moho underside reflection pmP

机译:Pamir-Hindu Kush中间地震区的底层底部地壳和地壳厚度变化从Moho下侧反射PMP推断出来

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AbstractThe Pamir–Hindu Kush region is an orogenic belt which formed as a result of recent continental collision between the Indian and Eurasian Plates. A comprehensive understanding of the tectonic history of this region has been hampered due to limited seismological investigations. In this study, we use the Moho underside reflection pmP phase to constrain crustal thickness variations in the intermediate-depth seismic zone (36–37°N, 69–72°E). The seismic events characterized by focal depth deeper than 100km and magnitude>5.8 (Mw) were used. The crustal thickness was determined by identifying the depth phase pP and the Moho underside reflection pmP. The measured thickness varies spatially from 58.1 to 76.2km, with uncertainties most likely resulting from deviation of the average P-wave velocities (~6.21km/s with a deviation of 0.22km/s) in the crust. The strong Moho depth variations imply a large structural deformation of the crust, which reflects a complex collision-related mountain building history. We also detected two strong reflections from deep interfaces down to ~97km underneath the southernmost Pamir. Based on our direct observations and waveform modeling, we interpret that the two reflections are possibly the manifestations of the underplating subducted Eurasian lower crust in this region. Our observations complement those of other seismic results, including receiver functions from previous studies.]]>
机译:<![cdata [ 抽象 Pamir-Hindu Kush Region是一种造山带,其形成为印度和印度近期的大陆碰撞欧亚板块。由于有限的地震调查,对该地区的构造历史的全面了解受到阻碍。在这项研究中,我们使用Moho下侧反射PMP阶段来限制中间深度地震区(36-37°N,69-72°E)的地壳厚度变化。使用焦点深度比100km和幅度> 5.8(MW)为特征的地震事件。通过识别深度相位PP和Moho下侧反射PMP来确定地壳厚度。所测量的厚度在空间上从58.1至76.2km变化,并且不确定因素最可能导致平均p波速度的偏差(〜6.21km / s在地壳中的偏差。强烈的Moho深度变化意味着地壳的大结构变形,这反映了一个复杂的碰撞相关的山地建筑历史。我们还检测到南最南端下方的深度界面的两个强烈反射到达到〜97公里。基于我们的直接观察和波形建模,我们解释了两种反思可能是该地区底层欧亚下壳的表现。我们的观察结果补充了其他地震结果,包括来自先前研究的接收函数。 ]]>

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