The Sichuan Basin, located to the east of the Tibetan plateau, experienced successive marine and continental depositions since the Sinian. Structures of the sedimentary cover and crystalline crust, e.g. thickness and Vp/Vs ratio, are of great significance to study the basin's properties and evolution, which have not been investigated simultaneously. In this paper, we extended the traditional single-layer H-k stacking method of receiver functions to a multilayer H-k stacking approach and applied it to invert for thickness and Vp/Vs ratio of the sedimentary cover and crystalline crust beneath 14 seismic stations in the Sichuan Basin. The observed thickness and Vp/Vs ratio of the sedimentary cover range from 4.2 km to 7.5 km and from 1.86 to 2.55, respectively, suggesting unconsolidated sediments containing water or other fluids. Two-layer sedimentary cover was observed beneath 8 stations, probably corresponding to the sediment in the Phanerozoic and Precambrian. The observed thickness and Vp/Vs ratio of the crystalline crust range from 33.4 km to 41.8 km and from 1.61 to 1.78, respectively, suggesting typical cratonic crust in the Sichuan Basin. Theoretical analyses of H-k stacking were further performed for different types of sedimentary basins, and the results suggest that the multilayer H-k stacking is more effective to study basin's structure with a thick sedimentary layer and thin subsediment crust.

中文翻译：

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四川盆地沉积盖层和晶体壳的结构及其构造意义

自震旦纪以来，位于青藏高原东部的四川盆地经历了连续的海洋和大陆沉积。沉积盖层和晶体壳的结构，例如厚度和Vp / Vs比，对于研究盆地的性质和演化具有重要意义，但尚未同时进行研究。本文将接收函数的传统单层Hk叠加方法扩展为多层Hk叠加方法，并将其应用于四川盆地14个地震台站下沉积覆盖层和晶体壳的厚度和Vp / Vs比的反演。 。观测到的沉积物覆盖层的厚度和Vp / Vs比分别在4.2 km至7.5 km和1.86至2.55范围内，表明含有水或其他流体的未固结沉积物。在8个台站下方观察到了两层沉积物覆盖层，可能与古生代和前寒武纪的沉积物相对应。观测到的地壳厚度和Vp / Vs比分别为33.4 km至41.8 km和1.61至1.78，表明四川盆地是典型的克拉通地壳。进一步对不同类型的沉积盆地进行了Hk堆积的理论分析，结果表明，多层Hk堆积对沉积层厚，沉积壳薄的盆地结构研究更为有效。表明四川盆地典型的克拉通地壳。进一步对不同类型的沉积盆地进行了Hk堆积的理论分析，结果表明，多层Hk堆积对沉积层厚，沉积壳薄的盆地结构研究更为有效。表明四川盆地典型的克拉通地壳。进一步对不同类型的沉积盆地进行了Hk堆积的理论分析，结果表明，多层Hk堆积对沉积层厚，沉积壳薄的盆地结构研究更为有效。