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Yang J，Li Q，Yuan Y R. 2021. Geomagnetic transform function anomaly before the MS5.5 Eryuan earthquake on March 3, 2013. Acta Seismologica Sinica，43（2）：215−226. DOI: 10.11939/jass.20200047
Citation: Yang J，Li Q，Yuan Y R. 2021. Geomagnetic transform function anomaly before the MS5.5 Eryuan earthquake on March 3, 2013. Acta Seismologica Sinica，43（2）：215−226. DOI: 10.11939/jass.20200047
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Geomagnetic transform function anomaly before the MS5.5 Eryuan earthquake on March 3, 2013

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

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  • Received Date: April 01, 2020
  • Revised Date: June 14, 2020
  • Available Online: April 28, 2021
  • Published Date: March 14, 2021
    Graphical Abstract
    • Abstract
  • The geomagnetic transform function represents the lateral inhomogeneity which could be used to study the changes of the underground electricity structure during the seismogenic process. In this study, the geomagnetic transform function and variation characteristics of geomagnetic induction vector for each measuring point of the geomagnetic array in northwestern Yunnan Province before and after the Eryuan MS5.5 earthquake on March 3, 2013 are analyzed by using the bounded influence estimation geomagnetic transform function. The results show that the absolute values of the real part of the transform function for Yunlong station and Eryuan station undergo a process of increase, turn and recover in more than one period during 1−2 months before the earthquake. The amplitude of the abnormal change is more than one time of the standard deviation. Before the earthquake, there is no obvious abnormal change in the transform function of the other measuring points which are far away from the epicenter or theaftershock area. The results show that the abnormal range of the geomagnetic transfer function before the Eryuan MS5.5 earthquake is less than 50 km, which may be related to the spatial distribution of the aftershock area.
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    • References (53)
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