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首页> 外文期刊>Journal of Asian earth sciences >Crustal shear-wave velocity structure beneath northeast India from teleseismic receiver function analysis
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Crustal shear-wave velocity structure beneath northeast India from teleseismic receiver function analysis

机译：基于远震接收函数分析的印度东北部地壳剪切波速度结构

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摘要

We investigated the seismic shear-wave velocity structure of the crust beneath nine broadband seismo-logical stations of the Shillong-Mikir plateau and its adjoining region using teleseismic P-wave receiver function analysis. The inverted shear wave velocity models show ～34-38 km thick crust beneath the Shillong Plateau which increases to ～37-38 km beneath the Brahmaputra valley and ～46-48 km beneath the Himalayan foredeep region. The gradual increase of crustal thickness from the Shillong Plateau to Himalayan foredeep region is consistent with the underthrusting of Indian Plate beyond the surface collision boundary. A strong azimuthal variation is observed beneath SHL station. The modeling of receiver functions of teleseismic earthquakes arriving the SHL station from NE backazimuth (BAZ) shows a high velocity zone within depth range 2-8 km along with a low velocity zone within ～8-13 km. In contrast, inversion of receiver functions from SE BAZ shows high velocity zone in the upper crust within depth range ～10-18 km and low velocity zone within ～18-36 km. The critical examination of ray piercing points at the depth of Moho shows that the rays from SE BAZ pierce mostly the southeast part of the plateau near Dauki fault zone. This observation suggests the effect of underthrusting Bengal sediments and the underlying oceanic crust in the south of the plateau facilitated by the EW-NE striking Dauki fault dipping 30° toward northwest.
机译：我们利用远震P波接收器函数分析研究了西隆-米奇尔高原的9个宽带地震台站及其毗邻地区下的地壳的地震剪切波速度结构。反向剪切波速度模型显示，西隆高原以下的地壳厚约34-38 km，而布拉马普特拉谷以下的地壳厚约37-38 km，喜马拉雅前缘区域的下地壳厚约46-48 km。从西隆高原到喜马拉雅前深区的地壳厚度逐渐增加，这与印度板块在地表碰撞边界以外的逆冲作用一致。在SHL站下方观察到强烈的方位角变化。从NE后方位角（BAZ）到达SHL站的远震地震的接收机功能建模显示，深度范围在2-8 km内有一个高速区，而深度范围在〜8-13 km内是一个低速区。相比之下，来自SE BAZ的接收器功能的反演显示，上地壳在〜10-18 km深度范围内有一个高速带，在〜18-36 km内则是低速带。对Moho深度处的射线穿透点的严格检查表明，来自SE BAZ的射线大部分穿透了Dauki断层带附近高原的东南部。该观察结果表明，EW-NE撞击Dauki断层向西北倾斜30°，促进了该邦南部沉积物的底冲作用和潜在的海底地壳。

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