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Dong C，Chen B，Yuan J H，Wang Z D，Wang C. 2021. Characteristic analysis of the lithospheric magnetic anomaly before the Madoi MS7.4 earthquake on 22th May 2021. Acta Seismologica Sinica，43（4）：453−462. DOI: 10.11939/jass.20210115
Citation: Dong C，Chen B，Yuan J H，Wang Z D，Wang C. 2021. Characteristic analysis of the lithospheric magnetic anomaly before the Madoi MS7.4 earthquake on 22th May 2021. Acta Seismologica Sinica，43（4）：453−462. DOI: 10.11939/jass.20210115
shu

Characteristic analysis of the lithospheric magnetic anomaly before the Madoi MS7.4 earthquake on 22th May 2021

  • Institute of Geophysics，China Earthquake Administration，Beijing 100081，China

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  • Received Date: June 27, 2021
  • Revised Date: August 01, 2021
  • Available Online: August 15, 2021
  • Published Date: July 14, 2021
    Graphical Abstract
    • Abstract
  • This paper analyzes and studies the magnetic anomaly characteristics of each component of the lithospheric magnetic field in the view of pre-earthquake changes of the lithospheric magnetic field near the epicenter of the Madoi MS7.4 earthquake using geomagnetic field vector data of the mainland of China in 2020 and 2019. The results show that before the Madoi MS7.4 earthquake, the lithospheric magnetic field components near the epicenter all changed to varying degrees. The Madoi MS7.4 earthquake epicenter is located at the weakly magnetic anomaly region, and near the zero-variation line of all the components. The Madoi MS7.4 earthquake epicenter is located between the high gradient belt and the low gradient belt of all the components. This paper confirms that the lithospheric magnetic anomaly will be changed before the earthquake, and summarizes characteristics of geomagnetic components magnetic anomaly, and provides a case for the future study of the seismo-magnetism, especially the earthquakes that magnitude larger than 7.0.
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