地震研究

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_S6.9 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 ΔM,the angle variation(φ_c)between state vector V_t-Δt 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 ΔM 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.

引言
1 方法介绍
2 资料选取及地震回溯性研究
3 讨论
4 结论

图1 材料均匀分成n个子区域示意图<br/>Fig.1 The material divided into n segments

图1 材料均匀分成n个子区域示意图
Fig.1 The material divided into n segments

图2 三维态矢量模型<br/>Fig.2 3D state vector model

图2 三维态矢量模型
Fig.2 3D state vector model

图3 门源6.9级地震前态矢量的参量M时序曲线<br/>Fig.3 Time history of parameter M of the state vector before the Menyuan,Qinghai MS6.9 earthquake

图3 门源6.9级地震前态矢量的参量M时序曲线
Fig.3 Time history of parameter M of the state vector before the Menyuan,Qinghai MS6.9 earthquake

图4 门源6.9级地震前态矢量的参量ΔM时序曲线<br/>Fig.4 Time history of parameter ΔM of the state vector before the Menyuan,Qinghai MS6.9 earthquake

图4 门源6.9级地震前态矢量的参量ΔM时序曲线
Fig.4 Time history of parameter ΔM of the state vector before the Menyuan,Qinghai MS6.9 earthquake

图5 门源6.9级地震前态矢量的参量φ时序曲线<br/>Fig.5 Time history of Parameter φ of the state vector before the Menyuan,Qinghai MS6.9 earthquake

图5 门源6.9级地震前态矢量的参量φ时序曲线
Fig.5 Time history of Parameter φ of the state vector before the Menyuan,Qinghai MS6.9 earthquake

图6 门源6.9级地震前态矢量的参量φc 时序曲线<br/>Fig.6 Time history of parameter φc of the state vector before the Menyuan,Qinghai MS6.9 earthquake

图6 门源6.9级地震前态矢量的参量φc 时序曲线
Fig.6 Time history of parameter φc of the state vector before the Menyuan,Qinghai MS6.9 earthquake

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备注

引言

1 方法介绍

2 资料选取及地震回溯性研究

3 讨论

4 结论

期刊信息