Inductive seismo-electromagnetic effect in relation to seismogenic ULF emission
Inductive seismo-electromagnetic effect in relation to seismogenic ULF emission
复制标题
与地震 ULF 发射相关的感应地震电磁效应
DOI：
10.5194/nhess-1-61-2001
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发表时间：
2001
影响因子：
4.6
通讯作者：
M. Hayakawa
中科院分区：
文献类型：
--
作者：
O. Molchanov;A. Kulchitsky;M. Hayakawa
地震波在地壳中传播时，由于磁流体在这种导电介质中的转换而产生电磁脉冲。在地震波激发和衰减的简单模型的假设下，问题归结为一个矢量势函数的类扩散方程的分析。这样，我们需要改变经典规范条件。在地电导率恒定的情况下，得到了该解的半解析形式。详细计算了电磁场分量和脉冲宽度对距离和地壳电导率的影响。研究结果对解释同震、前震和余震活动的电磁信号具有一定的参考价值。
During the seismic wave propagation through the crust, the electromagnetic pulse can originate due to MHD conversion in this conductive medium. On the assumption of simple models of seismic wave excitation and attenuation, the problem is reduced to the analysis of a diffusion-like equation for a vector potential function. In this way, we need to change the classical gauge condition. A semi-analytical form of the solution is obtained in a case with constant ground conductivity. Dependencies of the electric and magnetic field components and the pulse duration on distance and crust conductivity have been computed in detail. The results could be useful for the explanation of electromagnetic signals related to coseismic, foreshock and aftershock activity.