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Three-dimensional upper-crustal shear-wave velocity structure beneath the Shengyuan and Tianhuashan volcanic basins from seismic ambient noise imaging
Xuan WU, HongXing LI, ShuYan WANG
Prog Geophy ›› 2026, Vol. 41 ›› Issue (5) : 2395-2409.
PDF(13176 KB)
PDF(13176 KB)
Three-dimensional upper-crustal shear-wave velocity structure beneath the Shengyuan and Tianhuashan volcanic basins from seismic ambient noise imaging
The Shengyuan volcanic basin and the Tianhuashan volcanic basin are adjacent to each other, but they are located in the eastern segment of the Qin-Hang metallogenic belt and the North Wuyi metallogenic belt, respectively, and therefore have important geoscientific significance. In this study, a short-period dense seismic array was deployed in the region, and seismic ambient noise imaging was used to construct a three-dimensional shear-wave velocity structure of the upper crust shallower than 5 km. The results show that the Gan-Hang tectonic belt and the North Wuyi metallogenic belt exhibit significant shear-wave velocity differences: the former is generally characterized by low velocities, whereas the latter is dominated by high velocities. With increasing depth, the southern boundary of the Gan-Hang tectonic belt shifts northward as a whole, providing velocity-structure constraints on the shallow north-dipping thrust geometry of the Jiangshan—Shaoxing fault in the study area. At a depth of 5 km, the shear-wave velocity contrast between the Gan-Hang tectonic belt and the North Wuyi metallogenic belt decreases, indicating that the shallow velocity differentiation between the two tectonic units weakens with depth. In combination with the regional tectonic background, this feature may be related to the Caledonian compressional reworking after the Neoproterozoic amalgamation of the Yangtze and Cathaysia blocks, as well as the Yanshanian extension and magmatism associated with the NW-directed subduction of the Paleo-Pacific plate.
Volcanic basin / Seismic ambient noise / Shear-wave velocity structure / Direct surface-wave inversion / Metallogenic belt
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感谢审稿人对本文提出的宝贵修改意见和建议,感谢中国科学技术大学姚华建教授团队提供的背景噪声程序和面波直接反演程序, 感谢李红星教授以及汪舒妍的帮助.
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