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Fan Yingying, Xie Tao, An Zhanghui, Du Xuebin, Tan Dacheng, Liu Jun, Chen Junying. 2014: Electromagnetic phenomena before 2008 Wenchuan MS8.0 and 2010 Yushu MS7.1 earthquakes. Acta Seismologica Sinica, 36(2): 275-291. DOI: 10.3969/j.issn.0253-3782.2014.02.012
Citation: Fan Yingying, Xie Tao, An Zhanghui, Du Xuebin, Tan Dacheng, Liu Jun, Chen Junying. 2014: Electromagnetic phenomena before 2008 Wenchuan MS8.0 and 2010 Yushu MS7.1 earthquakes. Acta Seismologica Sinica, 36(2): 275-291. DOI: 10.3969/j.issn.0253-3782.2014.02.012
shu

Electromagnetic phenomena before 2008 Wenchuan MS8.0 and 2010 Yushu MS7.1 earthquakes

  • 1.

    Lanzhou Base of Institute of Earthquake Science， China Earthquake Administration， Lanzhou 730000， China

  • 2.

    Lanzhou Institute of Seismology， China Earthquake Administration， Lanzhou 730000， China

  • 3.

    China Earthquake Networks Center， Beijing 100045， China

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  • Received Date: February 02, 2013
  • Revised Date: November 07, 2013
  • Published Date: February 28, 2014
    Graphical Abstract
    • Abstract
  • This paper studied the changes of the geoelectric and geomagnetic fields before the 2008 Wenchuan MS8.0 earthquake in Sichuan Province and the 2010 Yushu MS7.1 earthquake in Qinghai Province using the wavelet power spectrum analysis. The results showed that: ① The increased wavelet power value of the geoelectric and geomagnetic fields were observed by the geoelectric stations and the geoelectromagnetic stations near the epicenter before the Wenchuan earthquake. ② The wavelet power value of the geoelectric and geomagentic fields significantly increased in the TIA station and so on in the northeastern margin of Qinghai-Tibet Plateau before the Yushu earthquake， which recovered after the earthquake. ③ The phenomena that the wavelet power value synchronously increased/decreased were recorded more than once at the different channels of different stations near the above two earthquakes. ④ The changes of the wavelet power value were almost same observed by the NS and NW channels of Sandan station and Gufeng station, which are at the same distance from the epicenter of Yushu earthquake. Based on the above analysis， we drew the conclusion preliminarily that the geoelectromagnetic anomalies were mainly caused by the electromagnetic radiation stimulated by the focal development.
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    • References (34)
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