陕甘宁青中强地震与太阳及磁暴活动的关系的统计分析

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。

STATISTICAL ANALYSIS ON RELATIONSHIP BETWEEN MODERATE STRONG EARTHQUAKES IN SHAANXI, GANSU, NINGXIA AND QINGHAI AREAS AND SOLAR AND MAGNETIC STORMS ACTIVITY

In this paper, seismicity indexes A_N-W(b)of Shaanxi, Gansu, Ningxia and Qinghai areas, magnetic storm activity indexes K(b) recorded at Lanzhou Geomagnetic Observatory and sun-sports relative numbers year-average-values R(N) are statisticaly analyzed. We do power spectral analysis and digital filtering. The power spectrum and maximum entropy spectral (MES) analysis of R(N), A_N-W(b) and KSC (b) indicates five main peaks:21, 11, 5, 3and 2 years. Their mutual correlation amplitude and the cross-spectral amplitude represent distinctly that there are above mentioned periods in R (N), A_N-W (b) and KSC (b), too. The correlation analysis showed that correlation coefficient is 0.886 between KSC (b) and A_N-W (b) after perfect low-pass filtering. According to this analysis, that seismicity of Shaanxi, Gansu, Ningxia and Qinghai areas can continue to change stronger in five years is represented. Finally, the mechanism of the seismogenic and triggering process related to the solar activity and magnetic storms is discussed.