地磁“红绿灯”法,是利用地磁垂直分量(z)预报地震时的一种数据处理方法。设A、B为两个不同纬度,经度基本相同的地磁台,两台每天相同整点时刻值相减,其最大差值与最小差值的差,称为“红绿灯”值z_(io)令 The geomagnetic “traffic light” method is a data processing method when using the geomagnetic vertical component (z) to predict earthquakes. Let A and B be two geomagnetic stations with different latitudes and longitudes, and subtract the values ​​of the same whole point from day to day. The difference between the maximum difference and the minimum difference is called the “traffic light” value z io