全球巨震的天文背景  

Astronomical Background of Global Huge Earthquakes

作　　者：胡辉[1] 韩延本[2] 

机构地区：[1]中国科学院国家天文台云南天文台,云南昆明650011 [2]中国科学院国家天文台,北京100012

出　　处：《天文研究与技术》2006年第1期77-84,共8页Astronomical Research & Technology

基　　金：国家自然科学基金资助项目(No.10373017)

摘　　要：分析了全球8.5 M以上巨震的天文背景,分析结果表明,这些巨震大都发生在处于月亮轨道运动所对应的地震活跃期的地震带区,太阳活动的下降段与地球自转的加速期。这是就天文因素的长周期变化而言。对于天文因素的短周期变化,无论是对于地方时,地方恒星时与月相,都有集中发生在某一段时间的现象;对于地球自转的短周期变化更是比较明显,要么发生在其变化最快时期,要么发生在其变化的最慢时期。这一切都表明,这些地震的发生是受天文因素的影响的。天文因素是外界发震动力之一,长周期变化的天文因素可能是对地震的孕育、发展与发生起着调制作用,而短期变化的天文因素则是当其作用于远离平衡态的发震构造上时,引起系统的巨涨落,从而诱发地震。This paper analyzes the astronomical background of the global huge earthquakes with M ≥ 8.5 . The result shows that most of the earthquakes has occurred in the seismic belts （regions） where is being corresponding seismic active period with the lunar path, solar active falling period and accelerating period of earth rotation. This is as for the variation of long period of astronomical factors. For the variation of short period of astronomical factors, whether for local time or local sidereal time and lunar phase there is the phenomenon of occurrence of concentrating a interval time for the earthquakes. For the short variation of earth rotation this phenomenon is clear; either the earthquakes occur in most fast or in lowst of earth rotation. The above-mentioned results indicate that the earthquakes occurrence is affected by astronomical factors. The astronomical factors are one of motive force causing earthquake from external world. The astronomical factors with long period may act as modulation for the earthquake-pregnant process. And the astronomical factors with short period will causing huge fluctuations of the system and earthquake occur when it act on seismic structure of away from balance state.

关 键 词：巨震 天文背景 调制 触发 

分 类 号：P183.5[天文地球—天文学]