Abstract: A great number of examples show that both the destructive earthquakes and moderate or small earthquakes are related to the flood-water logging disaster (intense precipitation) to a certain extent. The certain relation between seismicity and flood-water logging disaster (intense precipitation) could be caused by osmo sising action of fluid on the rocks, the hot-dynamic action of the earth, the absorbing action of low atmospheric pressure on the pore gas and fluid in the rocks based on triggering of geotectonics. The area of middle and lower reaches of Yangzi River is the flood-water logging-prone region, where a series of rivers and lakes are developed, and also the moderately strong seismicity occurred. Therefore, the detailed study on the time for synchronously reaching the peak of seismicity and flood-eater logging disaster as well as the intensity of mutual action should be helpful to the comprehensive reduction of the disasters.

Key words: Floodw ater logging disaster, Seismicity, Mutual correlation, Area of middle and lower reaches of Yangzi River