【摘要】 对2019年靖西M_S5.2地震序列潮汐触发现象进行研究,计算了靖西地震和4.3级最大余震的潮汐库伦破裂应力,讨论靖西地震序列受固体潮调制的情况,并利用Shuster谱分析和KORRECT统计方法分析潮汐调制的优势周期成分。结果表明:(1)靖西地震发震断层面上潮汐库伦破裂应力为正值,受固体潮汐的调制触发作用显著;(2)地震序列在朔、望前后2天的地震发生率均高于背景水平,朔期地震发生率最高,序列受到半日潮和日潮的影响较为显著,且一定程度上也受到潮汐应力的调制;(3) 4.3级最大余震发生于潮汐调制时段,但潮汐应力对其发震断层产生阻滑作用,其活动可能主要与区域应力场增强和主震发生后震源应力场调整有关。更多还原

【Abstract】 In this paper, the tidal triggering phenomenon of the 2019 Jingxi M_S5.2 earthquake sequence is studied.We calculated the tidal Coulomb failure stress of Jingxi earthquake and the largest aftershock with M_S4.3, discussed the earth tide modulation of Jingxi earthquake sequence, analyzed the dominant periodic components of tidal modulation by Shuster spectrum and KORRECT.Three conclusions are obtained.(1) The tidal Coulomb failure stress on the surface of seismic fault of Jingxi earthquake is positive, which is significantly triggered by solid tide.(2) The average daily earthquake occurrence rate of the two days before and after the new moon and the full moon is higher than the background level, the occurrence rate of the new moon is the highest, the earthquake sequence is more significant by the influence of semi-diurnal tide and diurnal tide, and it is also modulated by tidal stress to a certain extent.(3) The largest aftershock with M_S4.3 have occurred in the period of tidal modulation, but the tidal stress exerted a sliding resistance on its seismogenic fault.The activity of M_S4.3 earthquake may be mainly related to the enhancement of regional stress field and the adjustment of focal stress field after the occurrence of the main shock.更多还原