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《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:

期数:

2025年02期

页码:

247-252

栏目:

出版日期:

2025-02-10

文章信息/Info

Title:

Research on the State Vector Anomaly before the Menyuan,Qinghai M_S6.9 Earthquake

作者:

张小涛; 余怀忠

(中国地震台网中心,北京 100045)

Author(s):

ZHANG Xiaotao; YU Huaizhong

(China Earthquake Networks Center,Beijing 100045,China)

关键词:

态矢量;  门源地震;  回溯性研究;  地震异常

Keywords:

state vector;  the Menyuan M_S6.9 earthquake;  retrospective study;  seismic anomaly

分类号:

P315.72

DOI:

10.20015/j.cnki.ISSN1000-0666.2025.0026

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。

Abstract:

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.

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备注/Memo

备注/Memo:

收稿日期:2024-04-02.
基金项目:国家自然科学基金联合基金(U2039205); 国家重点研发计划(2018YFE0109700).
第一作者简介:张小涛(1982-),高级工程师,主要从事地震活动性方面的研究.E-mail:zhangxiaotao@seis.ac.cn.

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更新日期/Last Update: 2025-03-10