From 26 April to 8 May 2020, an earthquake sequence occurred in the Haenam region in southwestern Korea. The main shock with a moment magnitude of 3.2 occurred on 3 May. It was preceded by 38 foreshocks that occurred over a week, with magnitudes ranging from 0.8 to 2.7, and was followed for another week by 35 aftershocks with magnitudes ranging from 0.5 to 2.4. The P-wave first-motion indicates that the focal mechanism of the mainshock was a strike of 193° or 102°, a dip of 83° or 78°, and a rake of –168° or –7°. The stress orientation of the focal mechanism is consistent with the regional tectonic stress field. Spectral analysis of the mainshock indicates that it occurred on a fault with a radius of 216 ± 4.58 m and a stress drop of 31.4 ± 2.35 bar. The hypocenters of the sequence, determined using the double-difference method, were shown to cluster along a trend striking 100° and dipping 65° to the south at a depth of 20.1 ± 0.05 km, which indicates that the earthquakes in the sequence occurred within a rupture radius of the mainshock. Detailed seismic analysis of the sequence indicates that closely located subfaults or small weak zones were related to the mainshock.

2020年4月26日至5月8日，韩国西南海南地区发生了地震。5月3日发生了主震，震级为3.2。在此之前的一周中发生了38次前震，震级范围从0.8到2.7，随后一周发生了35次余震，震级范围从0.5到2.4。P波初动表明，主震的震源机制为193°或102°的打击，83°或78°的倾角和–168°或–7°的斜度。震源机制的应力方向与区域构造应力场一致。主震的频谱分析表明，它发生在半径为216±4.58 m且应力降为31.4±2.35 bar的断层上。使用双差法确定的序列的震中，结果表明，这些地震沿一个向100°倾斜的趋势聚集，并向南倾斜65°，深度为20.1±0.05 km，这表明该序列的地震发生在主震破裂半径之内。对该序列进行的详细地震分析表明，位于附近的亚断层或小的薄弱区域与主震有关。