| Citation: | Hongwei Wang, Xiaofeng Tian, Qiaoxia Liu, Jia Cheng, Ming Zhou, Zhiping Xu, Jiyan Lin, Shuaipeng Zhu. Sedimentary Structure Characteristics and Spatial Distribution Pattern of the Zhaoji Salt Mine Derived from Dense Array Ambient Noise Tomography. Journal of Earth Science, 2025, 36(5): 2094-2108. doi: 10.1007/s12583-024-0050-z
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Due to the lack of the three-dimensional structure of the Zhaoji Salt Basin, the salt mining enterprises have obvious clustering when choosing sites. Production capacity declines rapidly as mining deepens, and the enterprises are entering a stage of stagnation in production. In this study, a dense seismic array of 125 short-period stations was deployed around the core mining area and its vicinity of the salt mine industry, we used the ambient noise tomography (ANT) method to image the three-dimensional shear wave velocity structure at the depth shallower than 3 km. The results indicate: (1) The overall shear wave velocity in the study area is relatively lower, ranging from 0.8 to 1.8 km/s, which could be related to the loose and thick deposition of the Zhaoji sub-depression. (2) The three-dimensional shear wave velocity structure reveals that the sedimentary thickness of the Zhaoji sub-depression is deeper in the southeast and shallower in the northwest, with the sedimentary center located around Heping Town and Dahuangzhuang Town. (3) The Zhaoji salt mine is a low-velocity anomalous zone in the shear wave velocity structure with an inverse 'C' character spreading along Nanchenji Town and Zhaoji Town, with a depth ranging from approximately 1.2 to 2.8 km, it may be caused by the development of rock fissures due to water extraction and injection. The surrounding rock exhibits relatively high velocity, which reflects the morphological characteristics of the Zhaoji Salt Basin. The three-dimensional shear wave velocity model obtained in this study provides scientific guidance for the industrial exploitation of the Zhaoji salt mine and reference for salt exploration of the Hongze Salt Basin. It also provides an important basis for the seismic risk assessment of the salt basins. Simultaneously, it holds significant implications for exploring the application of ambient noise tomography method in spatial detection of salt mine belt.
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