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根据电磁波在地壳及大气波导层中传播的模拟实验,讨论了地震电磁信号在超低频及甚低频频段内的传播特征。用一块花岗岩板和两块铝板分别模拟地壳、电离层和地下导电层,用海洋被铝薄膜覆盖的地图来模拟希腊群岛及其周围的海。为了弄清海洋对电磁波传播的影响,将从模拟震源发出的电磁波的传播强度标在地图上。我们得到了甚低频电磁波的长距离传播,而超低频电磁波传播从震中开始呈指数衰减。考虑波导的这一实验也许能够解释海洋对地震电磁信号的选择性和长距离传播的影响,这里所说的地震电信号可能还包括VAN方法中的地震电信号。
According to the simulation experiment of electromagnetic wave propagation in the crust and the atmospheric wave guide layer, the propagation characteristics of the electromagnetic signal in the ultra-low frequency and very low frequency band are discussed. The earth’s crust, ionosphere and underground conductive layer were simulated by a granite slab and two aluminum slabs, respectively. The map of the ocean covered by an aluminum film was used to simulate the Greek archipelago and the sea around it. In order to understand the influence of the ocean on the electromagnetic wave propagation, the intensity of the electromagnetic wave emitted from the simulated source is marked on the map. We got the long-distance transmission of very low frequency electromagnetic waves, and the propagation of ultra-low frequency electromagnetic waves started exponentially from the epicenter. This experiment taking into account the waveguide may be able to account for the effects of the ocean on the selectivity and long-range propagation of seismic electromagnetic signals, which may also include seismic electrical signals in the VAN method.