New experiments of CSELF electromagnetic method for earthquake monitoring

作者：Zhao Guo-Ze^*; Wang Li-Feng; Tang Ji; Chen Xiao-Bin; Zhan Yan; Xa Qi-Bin; Wang Ji-Jun; Cai Jun-Tao; Xu Guang-Jing; Wan Zhan-Sheng; Wang Xiao; Yang Jing; Dong Ze-Ye; Fan Ye; Zhang Ji-Hong; Gao Yan

来源：Acta Geophysica Sinica, 2010, 53(3): 479-486.

DOI：10.3969/j.issn.0001-5733.2010.03.002

• Control source extremely low frequency
• Electromagnetic field
• Apparent resistivity
• Earth tide
• Earthquake monitoring

The new experiment of 30 days was carried out at twelve earthquake monitoring stations and a few mobile observatories located in North, South, NE, NW and SW China using Control Source Extremely Low Frequency (CSELF) electromagnetic technique in 2009. The measurement indicates that the artificial electromagnetic signals can be recorded at stations as far as 1700km from the transmitter. The measured electric and magnetic fields and apparent resistivity using CSELF signals have much more powerful ability to resist the interference of cultural noise in comparison to natural electromagnetic signals. They are much more stable than those using natural signals, which is favorable to identifying the anomalous phenomena caused by earthquake. The experiment shows that CSELF is potentially valuable for earthquake research and prediction. It is also found that the recorded electric and magnetic component amplitude of CSELF signal varies depending on the distance and azimuth of the observatories relative to the transmitter. These amplitudes decline with increasing distance between observatory and transmitter faster within some space extent than those outside the extent. It may be easier for magnetic components to have higher ratio of signal to noise than for electric component.

• 出版日期2010-3
• 单位北京大学; 中国地震局; 黑龙江省地震局