2022年青海门源6.9级地震前态矢量异常研究  

Research on the State Vector Anomaly before the Menyuan,Qinghai M_(s)6.9 Earthquake

作　　者：张小涛[1] 余怀忠[1] ZHANG Xiaotao;YU Huaizhong(China Earthquake Networks Center,Beijing 100045,China)

机构地区：[1]中国地震台网中心,北京100045

出　　处：《地震研究》2025年第2期247-252,共6页Journal of Seismological Research

基　　金：国家自然科学基金联合基金(U2039205);国家重点研发计划(2018YFE0109700)。

摘　　要：2022年1月8日青海门源6.9级地震前存在多项地震活动性和地球物理异常,利用态矢量方法回溯性研究其震前异常,通过遍历3°×3°至12°×12°的研究区域发现,选取8°×8°的研究范围能更好地反映震前异常;震前门源地震存在态矢量的模(M)、态矢量增量的模(ΔM)、态矢量之间的夹角变化(φ)和态矢量与单位矢量的转角变化(φ_(c))4个参量的异常;4个参量中的M和ΔM映震效果要优于φ和φ_(c)。总体来看,门源地震前态矢量异常变化平稳,震前异常突出,属于中短期异常。There were multiple seismic and geophysical anomalies before the Menyuan,Qinghai M_(s)6.9 earthquake on January 8,2022.In this paper we adopted the state vector method to retrospectively study the anomalies before the Menyuan earthquake.By traversing the sub-regions from 3°×3°to 12°×12°around the epicenter of the Menyuan earthquake,we found that the 8°×8°sub-region can best reflect the Menyuan earthquake anomalies.Four parameters of the state vector became anomalous before the Menyuan earthquake.They were state vector modulus M,state vector modulus increment △M,the angle variation(φ_(c))between state vector V_(t-△t) and state vector V_(t), the corner variation(V_(e))between state vector V_(t)(at any time)and unit vector.Of these 4 parameters,M and △M have better precursory effect than φ and φ_(c).Generally,before the Menyuan earthquake,these anomalies were continuous and significant.They were short-and medium-term anomalies.

关 键 词：态矢量 门源地震 回溯性研究 地震异常 

分 类 号：P315.72[天文地球—地震学]