Using a topography-dependent tomographic scheme, the seismic velocity structure of the Eastern Tibetan Plateau, including the uplifted Longmenshan (LMS) orogenic belt, is accurately imaged in spite of the extreme topographic relief in the LMS region and thick sedimentary covers in the neighbouring Sichuan Basin. The obtained image shows a high-resolution upper crustal structure on a 500 km-long profile that is perpendicular to the LMS. The image clearly shows that the crystalline basement was uplifted within the LMS orogenic belt, and that the neighbouring Songpan-Ganzi Terrane was covered by a thick flysch belt, with evidence of near-surface thrust faults caused by convergence between Eastern Tibet and the Sichuan Basin. The indication that the lower crust beneath the LMS was folded and pushed upwards and the upper crust was removed by exhumation, supports the concept of a lower crustal channel flow beneath Eastern Tibet. The image also reveals that the destructive Wenchuan earthquake of year 2008 occurred in the upper crust, directly at the structural discontinuity between Eastern Tibet Plateau and the Sichuan Basin.

译文

:尽管地形复杂,地形复杂,邻近地区厚厚的沉积物覆盖层,但仍采用与地形有关的层析成像方案,准确地成像了包括隆起的龙门山造山带在内的青藏高原东部的地震速度结构。四川盆地。所获得的图像在垂直于LMS的500?km长的剖面上显示了高分辨率的上地壳结构。该图像清楚地表明,LMS造山带内的晶体基底隆起,并且相邻的松潘-甘孜地貌被厚厚的复理带覆盖,并显示了西藏东部和四川盆地之间的辐合引起的近地表逆冲断层。 。 LMS下方的下部地壳已被折叠并向上推,而尸体被掘出后被去除了,这表明了藏东地区下部地壳通道流动的概念。该图还显示,2008年汶川特大地震发生在上地壳上,直接发生在青藏高原东部与四川盆地之间的构造不连续处。

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