Variation characteristics of b value of Lushan M6.1 earthquake sequence in 2022
On June 1,2022,a 6.1 magnitude earthquake occurred in Lushan County,Ya'an City,Sichuan Prov-ince.In order to study the characteristics of the b value changes of this earthquake and the risk of future moderate to strong earthquakes in the region,this article takes 40 kilometers on both sides of the Longmenshan fault zone where the epicenter is located as the research area.The integrity of the earthquake sequence since 2009 in the research ar-ea is analyzed by using the fitting detection method in the ZAMP program,and the temporal and spatial changes of b value in the research area are calculated by using the maximum likelihood method.The average background b val-ue in this area during the time scan is around 0.71.When the b value is less than this value,the likelihood of an earthquake with a magnitude of 5 or above increases.The spatial scanning results indicate that the location of the Lushan 6.1 magnitude earthquake is in a low b value zone.Based on comprehensive analysis,there is a possibility of moderate to strong earthquakes occurring in the region in the future.
NETL
NSTL
万方数据
