Identification of lateral boundaries for the subsurface structures is a popular topic in many applications of geoscience. For this purpose, many edge detection and enhancement methods have been introduced to determine the lineaments of subsurface structures. In this study, the improved parabola-based method has been applied to reveal the lineaments of subsurface structures of Nam Dinh province. The obtained results have shown that there are NW–SE trending structures in this region and most of the lineaments are in the depth range of 2 km to 8 km. These results provide a new perspective to help us better understand the structural framework and tectonic settings of the study area.

识别地下结构的横向边界是许多地球科学应用中的热门话题。为此，引入了许多边缘检测和增强方法来确定地下结构的线条。在这项研究中，改进的基于抛物线的方法已被应用于揭示南定省地下结构的轮廓。研究结果表明，该区存在NW-SE向构造，大部分线状构造深度在2～8km范围内。这些结果为帮助我们更好地理解研究区的构造框架和构造环境提供了新的视角。