The southwestern Gyeonggi Massif features many faults. The main faults are NE-striking faults, including the Jeonju and Kwangju faults, and they are cut by N-S- and NNE-striking faults. Additionally, E-W-, WNW-, and NW-striking faults occur as minor faults. Historical earthquakes with magnitudes greater than 5.0 have occurred on or near these faults. Earthquakes with focal depths shallower than 12 km have generally occurred on the NE-, NNE-, and N-S-striking faults, while those with hypocenters deeper than 12 km have occurred on the NW-, WNW-, and NE-striking faults or do not show a relationship with any faults. The instrumental earthquakes with magnitudes greater than 5.0 in the Korean Peninsula mainly have hypocenters deeper than 12 km, and their epicenters form a NW-oriented trend. These data effectively reflect two seismogenic layers with a boundary at ca. 12 km, as suggested in a previous study. The recent earthquake in the Haenam area occurred in the lower seismogenic layer. The shallower earthquakes seem to be the result of the reactivation of pre-existing faults. In comparison, the deeper earthquakes tend to occur on recently formed or newly formed faults related to the present regional stress of the Korean Peninsula. The shear-wave velocity tomography of the southwestern Gyeonggi Massif at 1 km corresponds well to the geology. In contrast, the shear-wave velocity variations at 5–9 km generally correspond to the locations of brittle faults. The depth of the ~3.5 km/s isovelocity line is quite irregular and is deeper in areas with active fault movement. In the Gyeongsang basin, the relationship between the shear-wave velocity and faults is somewhat unclear because the thickness of low-density sedimentary rocks is up to 8 km. Shear-wave velocity tomography at 13 km can be used to identify areas with high shear stress. These data indicate that shear-wave velocity tomography may provide different information depending on the depth and that the brittle faults in this region may not extend to a depth of 13 km.

京畿道西南部有许多断层。主要断层为全州和光州断层等东北向断裂，被东北向和北北向断裂切断。此外，EW，WNW和NW引发的故障是次要故障。在这些断层或其附近发生了大于5.0级的历史地震。震源深度小于12 km的地震通常发生在NE，NNE和NS地震断裂上，而震源深度大于12 km的地震则发生在NW，WNW和NE地震断裂上或发生了地震。没有显示出与任何故障的关系。朝鲜半岛震级大于5.0的仪器地震主要震源深于12 km，震中形成西北偏向。这些数据有效地反映了两个地震发生层，其边界为。12公里，如先前的研究建议。海南地区最近发生的地震发生在下地震发生层。较浅的地震似乎是重新存在的断层的结果。相比之下，与朝鲜半岛目前的区域应力有关的最近形成或新形成的断层往往会发生更深的地震。京畿道西南部1 km处的横波速度层析成像与地质学非常吻合。相反，在5-9 km处的剪切波速度变化通常对应于脆性断层的位置。〜3.5 km / s等速线的深度很不规则，并且在活动断层活动的区域更深。在庆尚盆地 由于低密度沉积岩的厚度达8 km，剪切波速度与断层之间的关系还不清楚。13 km的剪切波速度层析成像可用于识别剪切应力较高的区域。这些数据表明，横波速度层析成像可能会根据深度提供不同的信息，并且该区域的脆性断层可能不会延伸到13 km的深度。