大地震前震源区附近显著地震地方平太阴时分布特征及解释

研究了１２次７级地震和４４次６级地震震前震源区及其附近发生的显著地震地方平太阴时τ的分布规律．根据月亮在地球内任一点形成的起潮力是一个主要周期为１２ｈ２５ｍｉｎ左右的周期性函数及月亮在地方平太阴时相隔１８０°的两个位置上对地球内任一点起潮力基本相同这一现象，计算了大地震前两个显著地震地方平太阴时τ的夹角△τＡ以及两个显著地震地方平太阴时与主震地方平太阴时夹角的平均值△τＢ。计算结果表明，对大部分地震，△τＡ≤４５°和△τＢ≤４５°，说明显著地震和主震发生时，月亮差不多都在震源区的同一方位或与这一方位相隔１８０°的位置附近．用裂隙串通地震孕育模式对这一现象作了解释，认为显著地震和主震的地方平太阴时的分布都与主震断层走向有关．指出△τＡ≤４５°这一现象可作为一种地震前兆用于地震预报。

DISTRIBUTION OF LOCAL MEAN LUNAR TIMES OF SIGNIFICANT SHOCKS IN SOURCE REGION AND ITS VICINITY BEFORE LARGE EARHQUAKE AND ITS EXPLANATION

The distribution of local mean lunar time t of significant shocks happened in source region and its vicinity before a large earthquake is studied in this paper.12 earthquakes with Ms7 and 44 earthquakes with Ms 6 are studied in this paper. The tidal generation force arisen by the moon is a cyclic function or abut 12 hour 25 minute in the main and the two tidal generation forces anywhere in the earth arising by the moon are equal in general when the moon lies to the two sites of 180°interval of local moon lunar time. Based on this phenomenon the crossing angle △τA between local mean lunar time of two significant shock before a large earthquake and the mean vale △τB of the crossing angles between the local mean lunar time of two singificant shocks and the main earthquake are calculated in this paper.The calculated results show that in regard to most earthquakes the value △τA and △τB are less than or equdl to 45°, and which clear up that the moon locates at abut same azimuth of the source region or the vicinity of 180°from the azimuth when significant shocks and the main earthquake happened. The results are explained by IPE model of earthquake preparation in this paper, and it is possible that the distribution of the local mean lunar time of the significant shocks and the main earthquake is relative with the fault trend of main earthquake. The paper point out that the phenomenon of △τA≤45°may be a earthquake precursor and applied to earthquake prediction.