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Application of polarization method to geomagnetic data from the station Chengdu
|Authors:||He Chang; Feng Zhisheng|
|Author Affiliations:||Primary: |
Earthquake Administration of Sichuan Province, Chengdu, China
Earthquake Administration of Jiangsu Province, China
|Volume Title:||Dizhen Xuebao Acta Seismologica Sinica|
|Source:||Dizhen Xuebao = Acta Seismologica Sinica, 39(4), p.558-564. Publisher: Kexue Chubanshe, Beijing, China. ISSN: 0253-3782|
|Note:||In Chinese with English summary|
|Summary:||Based on the 1-second sampling data derived from FHDZ-M15 digital recording geometry of the station Chengdu, we applied polarization method to analyzing the possible ultra-low frequency electromagnetic phenomena associated with ML=5.0 earthquakes surrounding the station. It was shown that the long-term curve of the polarization value of the station Chengdu exhibits annual variations. By applying the Fourier fitting, the periodic annual variations were eliminated, and the analysis results on residuals between polarization values and fitting ones indicate that the increasing of the polarization value has a close relationship with ML=5.0 earthquakes which would happen in two months, and the appearance duration of the high value was one day to five days. Meanwhile, there was no correlation between the ultra-low frequency electromagnetic phenomena and the space current activity; the abnormal amplitude of polarization value before the thrust earthquake is higher than that of the strike-slip type.|
|Copyright Information:||GeoRef, Copyright 2021 American Geosciences Institute.|
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