The Research On Temporal And Spatial Scaning Of Concentrative Degree Of Seismic Local Meanlunar Times

It It has already been an indisputable fact that lunar gravity can induce an earthquake, such as the 1906 San Francisco earthquake, 1923 Kanto earthquake, 1960 Chile earthquake, 1976 Tangshan earthquake, 1995 Osaka-kobe Earthquake,etc..All of them above took place in astronomical springs or neap tides. Besides, some shallow earthquake sequences were obviously triggered by tidal stress and strain, such as the seismic sequences of foreshocks-main shocks of the Longling earthquake, the seismic sequences of foreshocks-main shocks-aftershocks of the Xingtai earthquake and the seismic sequences of main shocks-aftershocks of the Tangshan earthquake etc.. Nowadays, how to make use of the lunar gravity's triggering to predict destructive earthquakes has become a very important topic in earthquake prediction research.Currently the research of lunar gravity's triggering in earthquake prediction can be divided into two categories. One is the use of semi-diurnal tides'triggering, such as the medium earthquake of mean local-lunar times'angle difference before strong earthquakes etc, to predict earthquakes; the other is to use the syzygial tide, such as the modulation ratio to predict earthquakes. In this paper, with help from the load-unload response ratio methods, we proposed the parameters of temporal and spatial scanning of concentrative degree of mean local-seismic-lunar times, based on the mechanics of predicting strong earthquakes using mean local-seismic-lunar times'angle difference. We also modified the frequency and angle reliability of the parameters to make the results more stable. On top of that, we calculated and analyzed the stability of the proposed parameters in East China. As a final step, we examined the prediction efficiency of the temporal scanning parameters, also their changes before destructive earthquakes, on some significant seismic belts in East China, and summarized the law of changes. The results show that the parameters have good stability, and provided good reference for prediction of destructive earthquake in East China, though several false and omitted cases were observed.