临震电磁幅射信号的准—静电磁场场强理论计算

THE THEORETIC CALCULATION OF INTENSITY OF QUASI-STATIC ELECTROMAGNETIC FIELD ABOUT ELECTROMAGNETIC RADIATION SIGNAL OF IMPENDING EARTHQUAKE

本文应用班尼斯特和迪尤布水平电偶极子准—静电磁场的工程表达式,利用1979年7月9日溧阳六级地震和1984年5月21日南黄海6.2级地震临震电磁波超低频观测结果,估算了这两次地震电磁发射的峰值电流矩IL,其量级分别为10~7—10~8安米(溧阳)和10~9安米(南黄海)。与按地壳波导原理所估算的结果吻合。

Employing P. R. Banister's engineering expression for horizontal electric dipole quasi-static electromagnetic field, makes an estimation hereof the peak current moment IL on the basis of the ultra-low frequency observasions for the electromagnetic waves before two esrthquakes: Liyang Ms=6.0 on July 9, 1979 and South Yellow Sea Ms=6.2 on May 21, 1984. The result is: the magnitude of IL=10~7-10~8 A. M for Liyang earthquake and the magnitude of IL=10^(?) A. M for South Yellow Sea earthquake. This is just the same as what we estimated on the principle of crust wavequide.