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[1]ZHAI Shilong,HUANG Jing,LEI Qing,et al.Consistency Analysis of the Monthly Variation of the Main Magnetic Field by the Global Geomagnetic Field Model and by the Geomagnetic Station in Xinjiang Area[J].Journal of Seismological Research,2024,47(02):253-262.[doi:10.20015/j.cnki.ISSN1000-0666.2024.0017]

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Consistency Analysis of the Monthly Variation of the Main Magnetic Field by the Global Geomagnetic Field Model and by the Geomagnetic Station in Xinjiang Area

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 47 Number of periods: 2024 02 Page number: 253-262 Column: Public date: 2024-06-01

Title:: Consistency Analysis of the Monthly Variation of the Main Magnetic Field by the Global Geomagnetic Field Model and by the Geomagnetic Station in Xinjiang Area

Author(s):: ZHAI Shilong¹; HUANG Jing²; LEI Qing¹; MAIMAITIMIN Tuergong¹; AISA Ismaili¹; (1.Earthquake Agency of Xinjiang Uygur Autonomous Region,Urumqi 830011,Xinjiang,China)(2.School of Water Conservancy and Civil Engineering,Xinjiang Agricultural University,Urumqi 830011,Xinjiang,China)

Keywords:: the Jiujiang-Ruichang earthquake; soil gas; geochemistry; Rn; CO₂

CLC:: P315.721

DOI:: 10.20015/j.cnki.ISSN1000-0666.2024.0017

Abstract:: After having been eliminated their exogenous magnetic elements,the observed data at five geomagnetic stations in Xinjiang region from August 2018 to July 2022 are analyzed for their consistency with the calculated values of the main magnetic field by the China Seismo-Electromagnetic Satellite Global Geomagnetic Field Model(CGGM)based on the data observed by the China Seismo-Electromagnetic Satellite(CSES).The results show that:①The monthly change rate(SVS)of the geomagnetic value observed at the stations is slightly larger than the monthly change rate SV_M calculated by CGGM model.The difference of the maximum monthly change rate of magnetic declination D is 0.08688’,and so is difference of the maximum monthly change rate of the magnetic inclination I.For other five magnetic elements,their own difference of the maximum monthly change rate is only 0.8914 nT.②The difference of the root mean square errors between the total geomagnetic intensity F calculated by CGGM model and the total geomagnetic intensity F calculated by the IGRF13 model is 26.7 nT.With the increase of the data from CSES,the computing accuracy of CGGM model will be improved.③Both the monthly variations of the values observed at the stations and the monthly variations of the calculated values by CGGM model have little deviation.The root-mean-square error of D ranges from 0.18’ to 0.41’.The root-mean-square error of I ranges from 0.18’ to 0.41’ too.H ranges from 4.61 nT to 5.10 nT.Z ranges from 2.24 nT to 2.68 nT.F ranges from 2.15 nT to 2.47 nT.X varies from 4.89 nT to 5.24 nT,and Y varies from 1.42 nT to 1.80 nT.All these indicate that the calculated values by CGGM model have good consistency with the observed values by stations.④The influence of external field could not be completely eliminated by extracting the mean value of the static day and static night.There would be several nanoteslas of magnetic residual superimposed in the monthly variation of the observed values at the station,resulting in a slight increase in the standard deviation of the monthly variation difference between the observed values at the station and the values calculated by the model.⑤The posterior comparative analysis shows that the long-term variation of the main magnetic field predicted by the CGGM model is in good agreement with the observed value at the station; the predicted values can well describe the long-term variation of the main magnetic field.

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Last Update: 2024-03-20