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在T.(1979)和Sano Y.(1982)的著作中指出了强震前地磁场明显减弱的情况。为查明M>7的地震与用K_P指数说明的地磁场全球磁情的可能关系,挑选了1965—1975年间磁静日中发生的100次强震。对震前两昼夜和震后两昼夜时间内K_P指数的情况作了研究。使用时期叠加法,该方法将发震时刻作为参考点。因此,将K_P指数随时间的变化看成是一个有100个现实的33个时间段(三小时间隔)的随机函数。根据统计分析公式,计算出上述100种情况的数学期望、离散、相关系数随时间的变化。
In the writings of T. (1979) and Sano Y. (1982), the apparent weakening of the geomagnetic field before strong earthquakes was pointed out. In order to find out the possible relationship between M> 7 earthquakes and the global magnetic field of geomagnetic field described by K_P index, 100 strong earthquakes occurred during the magnetostatic day of 1965-1975 were selected. The situation of K_P index in two days and nights and two days and nights after the earthquake was studied. Using the overlay method, this method uses the epoch time as a reference point. Therefore, treating K_P index over time as a random function with 100 realistic 33 time intervals (three-hour intervals). According to the statistical analysis formula, the math expectation, discreteness and the correlation coefficient of the above 100 cases are calculated with time.