Recently an earthquake sequence occurred in Haenam, southwestern part of the Korean Peninsula. Earthquake swarms are not unusual in the western region of Korea, which already experienced comparable series of earthquakes before the Haenam earthquake: in the Boryeong offshore (2013) and Baekryeong Island (2013 and 2019) regions. The M_L 3.1 earthquake occurred 21km WNW of Haenam on May 3, 2020 and the earthquake sequence occurred from April 26 to May 9 intensively. For two weeks, a dozen small foreshocks preceded the mainshock and more aftershocks occurred. In this paper, relocation of events with focal mechanisms based on the seismicity of the 2020 Haenam earthquake sequence is proposed. The distribution of earthquake sequence in Haenam area is WNW-ESE direction, which is approximately parallel to the fault plane solutions of events with M_L ≥ 2.0 indicating strike-slip faults. The sequential events concentrate within the elliptical area of about 0.18 km² on the surface and the focal depth distributions show some variations between 19.6 km and 21.6 km for different velocity models but their ranges are within about 500–600 m. The depth variations for different models can be due to the different boundary depths between upper and lower crusts. Based on a comparison of the earthquake swarms in the western region of the Korean Peninsula, this study provides seismological information for understanding the seismotectonic structures in the Korean Peninsula.

最近，在朝鲜半岛西南部海南发生了地震序列。地震群在韩国西部地区并不罕见，在海南地震之前，该地区已经经历了一系列可比的地震：在保宁近海（2013年）和白灵岛（2013年和2019年）地区。在中号_大号3.1地震发生于2020年5月3日海南岛21 km WNW，地震序列从4月26日至5月9日集中发生。两个星期以来，在主震之前发生了十二次小前震，并发生了更多余震。本文提出了基于2020年海南地震序列地震活动的震源机制事件重定位方法。在海南区域地震序列的分布是西北偏西- ESE方向，其大致平行于与事件的断层面解中号_大号≥2.0指示走滑断层。顺序事件集中在约0.18 km ²的椭圆区域内在表面上，不同速度模型的焦深分布在19.6 km和21.6 km之间有一些变化，但范围在500-600 m之间。不同模型的深度变化可能是由于上，下地壳之间的边界深度不同所致。通过对朝鲜半岛西部地区地震群的比较，本研究为了解朝鲜半岛地震构造结构提供了地震信息。