2020年7月12日唐山5.1级地震分析

Analysis of the Tangshan M5.1 earthquake on July 12,2020

对2020年7月12日唐山5.1级地震的发震特点\,地震的性质\,发震构造以及破裂机制进行初步分析,推测唐山断裂可能为其控震断裂。地震前唐山地区和震中所处的华北构造区的地震活动性异常以缺震和显著平静为主,表明该区域地壳应力积累到了一定程度。分析认为:此次唐山5.1级地震属于1976年7月28日唐山7.8级大震震区内的地震起伏活动;此次地震的序列本身并不丰富,震区烈度偏低、有感范围大。

This paper analyzed the seismogenic characteristics of the Tangshan M5.1 earthquake on July 12,2020.The nature,seismogenic structure,and rupture mechanism of the earthquake were preliminarily analyzed,then it was speculated that Tangshan fault may be its seismogenic fault.Before the earthquake,the seismicity anomalies in Tangshan area and North China tectonic region were mainly lack of earthquake and significant calm,indicating that the crustal stress in these areas had accumulated to a certain extent.The M5.1 earthquake belongs to the seismic fluctuation activity in the old seismic area of the Tangshan M7.8 earthquake on July 28,1976.The sequence of the M5.1 earthquake is not rich;the intensity of the earthquake area is low and the feel range is large.