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七十年代初,中外地震工作者先后发现震前有震源电磁辐射现象。由于震源电磁波信息对于地震的临震预报有意义,引起一些多震国家的关注。国内外的现场观测和岩石破裂模拟实验的结果表明,孕震区的电磁辐射伴随岩石块体破裂过程而产生;在一定的距离和接收频段上能够记录到震源辐射的电磁波;只要震前电磁辐射现象存在,就必然存在它的辐射源,这个辐射源可能就是正在孕育中的震源体本身。只要震源电磁辐射的这种波具有电磁波特性,就可以运用测向技术测定辐射源与观测点之间的相对方位角,然后通过几个不同的观测点在地图上交
Seventies, Chinese and foreign earthquake workers have found the source of electromagnetic radiation before the earthquake phenomenon. Due to the fact that the epicenter electromagnetic wave information is meaningful to the quake-prone earthquake prediction, it has aroused the concern of some earthquake-prone countries. The results of on-the-spot observation and rock fracture simulation show that the electromagnetic radiation in the seismogenic zone is accompanied by the rupture of the rock mass, and the electromagnetic radiation radiated by the source can be recorded at a certain distance and receiving frequency band. Phenomenon exists, there must be its source of radiation, the radiation source may be in the breeding body itself. As long as this wave of electromagnetic radiation of the source has the electromagnetic wave characteristics, the relative azimuth between the radiation source and the observation point can be measured by the direction finding technique, and then the map is handed over by several different observation points