Abstract Pingwu County, which is located at the northern end of the Longmenshan fault structural belt, has an active regional geological structure. For a long time, the Longmenshan fault tectonic belt has become intensely active with frequent earthquakes. According to the existing geological data, the Pingwu–Qingchuan fault passes through the urban area of Pingwu. However, because of the great changes in the original landform of Pingwu caused by the construction activities in this urban area, a precise judgment of the location of the Pingwu–Qingchuan fault according to the new landform characteristics is difficult. Here, the seismic reflection method, electrical resistivity tomography (ERT), and drilling method were used to determine the accurate location of the buried active faults in Pingwu County. The seismic reflection method and ERT are used to determine the location of faults, the thickness of overlying strata of the fault, and the basic characteristics of faults. The drilling data can be used to divide the bedrock lithology and confirm the geophysical results. The geological model of the faults can be constructed by 3D inversion of ERT, and the structural characteristics of the faults can be viewed intuitively. The results of this study can provide a basis for earthquake prevention and construction work in Pingwu. The finding also shows that seismic reflection method and ERT can effectively explore buried active faults in urban areas, where many sources of interferences may exist.

中文翻译：

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电阻率层析成像与地震反射法在四川平武地区隐伏活动断层勘探中的应用

摘要 平武县地处龙门山断裂构造带北端，区域地质构造活跃。长期以来，龙门山断裂构造带活动强烈，地震频发。根据现有地质资料，平武—青川断裂穿过平武市区。但由于该城区的建设活动对平武原有地貌造成较大变化，根据新的地貌特征准确判断平武-青川断裂的位置存在较大难度。在这里，利用地震反射法、电阻率层析成像（ERT）和钻孔法确定了平武县隐伏活动断层的准确位置。利用地震反射法和ERT确定断层的位置、断层上覆地层的厚度和断层的基本特征。钻探数据可用于划分基岩岩性和确认地球物理结果。通过ERT的3D反演可以构建断层的地质模型，可以直观地查看断层的构造特征。研究结果可为平武市的抗震建设工作提供依据。研究结果还表明，地震反射法和 ERT 可以有效地探测城市地区的埋藏活动断层，这些地区可能存在许多干扰源。钻探数据可用于划分基岩岩性和确认地球物理结果。通过ERT的3D反演可以构建断层的地质模型，可以直观地查看断层的构造特征。研究结果可为平武市的抗震建设工作提供依据。研究结果还表明，地震反射法和 ERT 可以有效地探测城市地区的埋藏活动断层，这些地区可能存在许多干扰源。钻探数据可用于划分基岩岩性和确认地球物理结果。通过ERT的3D反演可以构建断层的地质模型，可以直观地查看断层的构造特征。研究结果可为平武市的抗震建设工作提供依据。研究结果还表明，地震反射法和 ERT 可以有效地探测城市地区的埋藏活动断层，这些地区可能存在许多干扰源。