摘要
本文通过部分震例研究发现,在地磁低点位移异常日及附近,分布于低点位移线两侧的地磁垂直分量日变化畸变异常部分具有反相位变化特征,而水平分量无类似的现象。作者依据Biot-Savart定律推测,在低点位移异常期间,在低点位移线下方有一引起地磁垂直分量日变化畸变的电流通过,且该电流为线状分布,或仅在垂直面内有分布,埋深一般认为几十千米。作者同时分析认为,当这种电流的分布形成闭合圈或有东西分量时,地磁基本场对其产生的作用力对地震的发生可能有触发作用。
It is found that the aberrances of the diurnal variation of the geomagnetic vertical component which distribute over two sides of the boundary line of the geomagnetic low-point displacement have the anti-phase phenomenon at the period of the geomagnetic low-point displacement anomaly, but the H component has no such a phenomenon. According to the Law of Biot-Savart, the author concludes that there is an electric current which can distort the diurnal variations of the geomagnetic vertical component beneath the boundary line of the geomagnetic low-point displacement within and in the vicinity of the day of the geomagnetic low-point displacement anomalous. The electric current is of linear distribution, or is just distributed in the vertical sections, and the buried depth of the electric current is just several dezon kilometers. The author also concludes that the force which results from the interaction between the horizontal intensity H of the earth＇s main magnetic field and the electric current has a trigger-effect on earthquake, when the electric current forms into a loop or have the eastward component.
出处
《中国地震》
CSCD
北大核心
2009年第2期206-213,共8页
Earthquake Research in China
基金
地震科学联合基金(A07136)
国家科技支撑计划项目(2006BAC01B02-04-01)资助项目
关键词
地磁日变化
地磁低点位移
异常
机理
Geomagnetic diurnal-variation Low-point displacement Anomaly Mechanism
