Abstract: The theories, techniques and methods for the exploration of active faults in the terrestrial domain are relatively mature, while such efforts in the water domain remain very few. In this study, the AAE shallow profiler was used to detect the underwater three-dimensional topography and active faults in the Qionghai area, Xichang for the first time. Based on the SKUA-GOCAD software platform and its DSI interpolation method, three-dimensional modeling of the exploration data was carried out. The survey profiles clearly reveal three different reflection interfaces, including the underwater interface, the interface between the silt layer and shallow sedimentary layer, and the bottom of the shallow sedimentary layer. The three-dimensional topography of the Qionghai area was mapped initially. Moreover, evidence of active faults was first found in several survey profiles from the reflection interface cutoff. This study also analyzed and discussed the working principle and characteristics of the AAE shallow profiler, including their parameters and various factors of exploration. The mapped three-dimensional topography and active faults in the Qionghai area of Xichang can provide a reference for research on the active tectonics underwater in the future.

Key words: AAE shallow profiler, underwater exploration, 3-D topography, active fault, Qionghai of Xichang

摘要： 当前陆域活动断层研究的相关理论、探测技术和方法比较成熟，但针对水域的活动断层探测和研究还很缺乏。采用AAE浅层剖面仪，首次对西昌邛海水域三维地形和活动断层进行探测。探测剖面可以清楚地揭示水底反射界面、水下淤泥层底部与浅部沉积层的反射界面、浅部沉积层底部界面反射界面。文中基于SKUA-GOCAD软件平台及其DSI插值法对探测数据进行三维建模，初步给出了邛海水域三维地形结构；同时在多条探测剖面上，发现了则木河断层错断浅部沉积层和水下淤泥层的证据，表明该断层已延伸至邛海水域。探测结果对研究区的地震危险性评估提供了一定的资料基础。文中还分析和探讨了浅层剖面仪工作的特点、参数以及探测的各种影响因素。西昌邛海水域三维地形和活动断层的探测研究结果，可以为水域活动构造研究提供一定的参考和依据。

关键词: 浅层剖面仪, 水域探测, 三维地形, 活动断层, 西昌邛海