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Detection of ULF electromagnetic emissions as a precursor to two earthquakes in China
Authors:Qi Li  Peiyu Zhu  Alimjan Mamatemin  Xuegong Xu
Abstract:The geomagnetic data recorded by Kashi and Jinghai observatories in China were analyzed with improved polarization method. We compared the result around 0.01 Hz which is thought to be useful to detect the ULF anomaly with the result around 0.1 Hz which was inferred from the earthquake depth according to the skin effect, and found that 0.1 Hz is more proper to detect the ULF anomaly for both earthquakes studied in this paper.
Keywords:ULF anomaly  geomagnetic data  polarization analysis  earthquake precursor  
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