上海地区电磁辐射信号特征及其与大震的关系研究

Electromagnetic Radiation Signal Characteristics in Shanghai Area and Its Relation to Strong Earthquakes

通过对上海地区近5年电磁扰动观测资料的整理,从扰动能量的角度分别对雷电信号、高压输电信号、工业源信号、测区作业信号、地铁干扰信号和地震电磁扰动信号等观测异常信号的能量强度特征进行分析。结果表明:(1)目前上海及其周边地区不存在能使电磁扰动观测电场能量变化超过1 000mV/km量级的电磁辐射源;(2)青浦台记寻到的电磁扰动观测异常信号在变化形态上与其他可识别的异常信号存在明显差异,其中31次电磁扰动观测异常信号具有短期地震前兆异常的特性;(3)与震例对比分析后可知,大地震在孕震过程中产生的电磁信号可以远距离传播,其传播距离可以达到800km以上,甚至有可能超过2 000km。

Four sets of electromagnetic disturbance receivers were mounted on four stations in 2008 in the Shanghai region. We collected the observation data from the receivers in the five recentyears and analyzed the energy strength characteristics of the abnormal signals, including the lightning signal, the high-voltage transmission signal, and the industrial source signal. The results indicate the following. （1 ） In Shanghai city and its surrounding area, no electromagnetic radiation source can increase the energy of the electromagnetic disturbance observation field over 1 000 mV/km. （2） Thirty-one groups of abnormal signals of electromagnetic disturbance obser-vations at Qingpu station are obviously different from other abnormal signals, and these have characteristics of short-term earthquake precursory anomalies. （3） Comparative analysis reveals that the electromagnetic signals generated before strong earthquakes are able to propagate over a long distance of more than 800 km , and sometimes, even more than 2,000 km.