The Korean Peninsula is located in a low-seismicity zone at the eastern margin of the Eurasian plate. However, the 2016 Gyeongju and 2017 Pohang earthquakes, which occurred in southeastern Korea, highlight the importance of advanced seismic hazard assessment and mitigation in this region. We successfully performed spontaneous dynamic rupture modeling by considering the crustal stress field in southeastern Korea, constrained by earthquake focal mechanism data, to better understand the seismic hazard in the region. We found that the geologically recognized Yangsan fault trace near the location of the Gyeongju earthquake is not aligned well with the favorable shear rupture directions, given the current crustal stress field in the region. The fault needs to be very weak (i.e., have a low static friction coefficient) to initiate a large earthquake rupture. However, our dynamic model results show that the fault plane constrained by the focal mechanism solution of the 2016 Gyeongju earthquake is more favorably aligned for shear rupture under the current stress condition and that it may be able to produce a relatively large earthquake if the extension of the fault is quite long (~60 km). This type of dynamic rupture modeling study may help to more accurately elucidate the seismic hazard in a low-seismicity zone such as southeastern Korea.

朝鲜半岛位于欧亚板块东缘的低地震带。然而，在韩国东南部发生的2016年庆州和2017年浦项地震，突显了对该地区进行高级地震灾害评估和缓解的重要性。我们通过考虑朝鲜东南部的地壳应力场并受地震震源机制数据的约束，成功地进行了自发的动态破裂建模，以更好地了解该地区的地震危险性。我们发现，考虑到该地区当前的地壳应力场，庆州地震发生地点附近的经地质识别的梁山断层迹线与有利的剪切破裂方向并不吻合。故障必须非常弱（即，具有较低的静摩擦系数）来引发大地震破裂。然而，我们的动力学模型结果表明，在当前应力条件下，受2016年庆州地震的震源机制解约束的断层更易发生剪切破裂，如果地震波的扩展，可能会产生较大的地震。断层很长（〜60 km）。这种类型的动态破裂建模研究可能有助于更准确地阐明韩国东南部等低地震带的地震危险。我们的动力学模型结果表明，在当前应力条件下，受2016年庆州地震的震源机制解约束的断层更易发生剪切破裂，如果断层扩展，它可能会产生较大的地震。相当长（〜60 km）。这种类型的动态破裂建模研究可能有助于更准确地阐明韩国东南部等低地震带的地震危险。我们的动力学模型结果表明，在当前应力条件下，受2016年庆州地震的震源机制解约束的断层更易发生剪切破裂，如果断层扩展，它可能会产生较大的地震。相当长（〜60 km）。这种类型的动态破裂建模研究可能有助于更准确地阐明韩国东南部等低地震带的地震危险。