## Statistical Analysis of the Spatial and Temporal Correlation Between Seismicity and Tide-generating Force by the Sun and the Moon

**Feng Xiangdong1),Wei Dongping2)1)Earthquake Administration of Hebei Province,Shijiazhuang 050021,China,2)Computational Geodynamics Laboratory,Graduate School of Chinese Academy Sciences,Beijing 100039,China**

Based on the ISC earthquake catalogue data,according to the orbit equations of two-body-problem and the perturbation theory of celestial mechanics,we could determine the projection pole of the sun,and thus calculate the zenith distance from the sun to the epicenter.After calculating all the earthquakes on their zenith distances,we could get the distribution of the solar zenith distance versus the occurring probability of earthquakes.By the same method we also obtain the distribution of the lunar zenith distance versus the occurring probability of earthquakes.The results indicate that the distribution of the solar zenith distance versus the occurring probability of earthquakes is quite consistent with the lunar case,and the case for small earthquakes is different from the larger earthquakes.The latter is mainly clustered at 0o and 180o of the zenith distance,and consistent with the distribution of the absolute value of the solar(lunar)tide forces,while the former are clustered at 60o and 120o.Furthermore we set up the solar and the lunar zenith distances versus the occurring probability distribution of earthquakes.The occurring probability of earthquakes near the sun-pole and the moon-pole or their opposite points is higher than the average level.

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