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[1]ZHANG Xiaotao,YU Huaizhong.Research on the State Vector Anomaly before the Menyuan,Qinghai MS6.9 Earthquake[J].Journal of Seismological Research,2025,(02):247-252.[doi:10.20015/j.cnki.ISSN1000-0666.2025.0026 ]

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

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: Number of periods: 2025 02 Page number: 247-252 Column: Public date: 2025-02-10

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

Author(s):: ZHANG Xiaotao; YU Huaizhong; (China Earthquake Networks Center,Beijing 100045,China)

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

CLC:: P315.72

DOI:: 10.20015/j.cnki.ISSN1000-0666.2025.0026

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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Last Update: 2025-03-10