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本文对陕、甘、宁、青四省(区)地震活动性指数A_(N-W)(b)、兰州地磁台记录的磁暴活动性指数K(b)和太阳黑子相对数年均值R(N)进行统计分析,得出了太阳活动和地震以及磁暴活动均存在约21年、11年、5年、3年和2年左右的显著周期。它们的互相关幅度和交互谐幅度也表明,在上述显著周期内三者存在明显的相关性。理想低通滤波后的SC型磁暴K(b)和A_(N-W)(b)间的相关系数高达0.886。根据分析本文指出,陕、甘、宁、青四省(区)地震活动在以后五年内还会继续增强。最后就太阳活动和磁暴与地震的发生的关系作了讨论。
In this paper, the seismic activity index A_ (NW) (b), the geomagnetic activity index K (b) recorded by Lanzhou geomagnetic station and the annual mean R (N) of sunspots in Shaanxi, Gansu, Ningxia and Qinghai provinces Statistical analysis shows that there are significant periods of about 21 years, 11 years, 5 years, 3 years and 2 years in solar activities, earthquakes and magnetic storms. Their cross-correlation amplitudes and their interactive amplitudes also show that there is a clear correlation among the three in the above significant periods. The correlation coefficient between ideal low-pass filtered SC storms K (b) and A_ (N-W) (b) is as high as 0.886. According to the analysis, this paper points out that the seismic activity in Shaanxi, Gansu, Ningxia and Qinghai provinces (regions) will continue to increase in the next five years. Finally, the relationship between solar activity and magnetic storms and the occurrence of earthquakes is discussed.