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[1]LI Xia,ZHAO Yuhong,FENG Lili,et al.The Variation of Geo-electric Field at the Dulan Seismic Station before the 2021 Maduo,Qinghai MS7.4 Earthquake[J].Journal of Seismological Research,2021,44(04):642-649.

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The Variation of Geo-electric Field at the Dulan Seismic Station before the 2021 Maduo,Qinghai M_S7.4 Earthquake

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 44 Number of periods: 2021 04 Page number: 642-649 Column: Public date: 2021-11-10

Title:: The Variation of Geo-electric Field at the Dulan Seismic Station before the 2021 Maduo,Qinghai M_S7.4 Earthquake

Author(s):: LI Xia; ZHAO Yuhong; FENG Lili; LIU Lei; GOU Zhidong; SU Weigang; (Qinghai Earthquake Agency,Xining 810001,Qinghai,China)

Keywords:: the Dulan geo-electric field; the Maduo M_S7.4 earthquake; premonitorily abnormal characteristics; case-study of earthquakes

CLC:: P319.1

DOI:: -

Abstract:: On May 22,2021,an M_S7.4 earthquake occurred in Maduo County,Qinghai Province.Before the earthquake,the observed data of geo-electric field by the Dulan stotion shawed significant abnormal changes and were of credibility to some extent.And the form of the curve of the data is similar to that of the data before the 2019 Xiahe M_S5.7 earthquake.The main manifestations of the anomaly are as follows:Firstly,the original observed data showed anomalous annual variations in different degrees in July 2020,and the 6 survey channels of long distance and short polar distance changed synchronously.The annual variations mainly decreased and rose rapidly after reaching the lowest point.Secondly,the ratio of the observed data between the long polar distance and short polar distance of the geo-electric field showed that the V-shaped variations appeared sharply and rapidly in all directions prior to the earthquake.Thirdly,after the annual variation is removed by the Correlation Moment Plane method,the curves of the daily observed mean value of the geo-electric field showed a trend or a rapid decline after May 2020,and the interval change values are all less than the historic average level,or even lower than twice the mean square deviation level,and the abnormal form is significant.We believe that the abnormal variations of the geo-electric field in Dulan region since the year 2020 are related with the genesis and evolution of the Maduo M_S7.4 earthquake.

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Last Update: 2021-11-10