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Feng L L，Feng Z S，Fan W J，Guan Y L，He M Q，Li X，He C，Liao X F，Aisa Y，Yuan W X，Li S. 2021. Spatio-temporal variation characteristic of the ultra-low frequency magnetic field prior to strong earthquakes of western Chinese mainland. Acta Seismologica Sinica，43（3）：359−375. DOI: 10.11939/jass.20200093
Citation: Feng L L，Feng Z S，Fan W J，Guan Y L，He M Q，Li X，He C，Liao X F，Aisa Y，Yuan W X，Li S. 2021. Spatio-temporal variation characteristic of the ultra-low frequency magnetic field prior to strong earthquakes of western Chinese mainland. Acta Seismologica Sinica，43（3）：359−375. DOI: 10.11939/jass.20200093
shu

Spatio-temporal variation characteristic of the ultra-low frequency magnetic field prior to strong earthquakes of western Chinese mainland

  • 1.

    Geodynamics Field Observation and Research Station of Qinghai-Tibet Plateau，China Earthquake Administration，Qinghai Golmud 810001，China

  • 2.

    Qinghai Earthquake Agency ，Xining 810001，China

  • 3.

    Jiangsu Earthquake Agency，Nanjing 400071，China

  • 4.

    Yunnan Earthquake Agency，Kunming 650224，China

  • 5.

    Shandong Earthquake Agency，Ji’nan 250014，China

  • 6.

    Chongqing Earthquake Agency，Chongqing 401147，China

  • 7.

    Sichuan Earthquake Agency，Chengdu 610041，China

  • 8.

    Earthquake Agency of Xinjiang Uygur Autonomous Region，Ürümqi 830001，China

  • 9.

    Zhejiang Earthquake Agency，Hangzhou 310013，China

  • 10.

    Earthquake Agency of Guangxi Zhuang Autonomous Region，Nanning 530001，China

More Information
  • Received Date: June 04, 2020
  • Revised Date: March 01, 2021
  • Available Online: July 06, 2021
  • Published Date: May 14, 2021
    Graphical Abstract
    • Abstract
  • Based on the one second sampling data from fluxgate magnetometers in western Chinese mainland from 2015 to 2019, this paper carried out the vertical component polarization analysis of the frequency band between 5 s to 100 s, and then processed the analysis results by some mathematical methods. The results show that the high polarization value has no obvious shape and amplitude change in both meridional and zonal directions, and the high polarization value has nothing to do with geomagnetic field disturbance. On this basis, 18 high-value anomalies were screened out, and their spatial distribution map was obtained by interpolation method. The results show that within half a year after the synchronous appearance of multiple high-value anomalies of the vertical component polarization of geomagnetic field, the high-value region may have a strong earthquake with magnitude over M6.0. After the appearance of high value phenomenon, several high value regions are likely to have strong earthquakes; furthermore the magnitude of subsequent strong earthquake seems to be positively correlated with the area of the high-value zone.
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    • References (47)
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