This paper summarizes the seismicity anomalies before the Ms 5.0 earthquake in Mangshi,Yunnan Province on December 2,2023.It is found that there are medium-term,short-term,and imminent anomalies before the Mangshi earthquake.In the medium-term stage,the M ≥ 5.0 earthquakes in western Yunnan have the east-west migration rule,and the ML ≥ 4.0 earthquakes migrate from northwest Yunnan to west Yunnan.In the medium and short-term stages,the small and medium earthquakes in the west of Yunnan region are significantly enhanced,magnitude 3-4 earthquakes formed a seismogenic gap,and ML ≥ 3.0 earthquakes formed a seismic belt.In the short-term stage,an impending earthquake and a precursor swarm appear,and foreshocks occur 10 days before the Mangshi Ms 5.0 earthquake.It is concluded that the occurrence of the impending earthquake and precursor swarm is a sign that the seismogenic process has changed from the medium-term to the short-imminent stage.
关键词
芒市Ms/5.0地震/孕震空区/地震条带/逼近地震/前兆震群
Key words
Mangshi Ms 5.0 earthquake/seismogenic gap/seismic belt/impending earthquake/precursor swarm
万方数据