On March 24, 2008, an ML4.6 earthquake occurred in Zhushan, Hubei province. We proposed that the earthquake is a normal seismic activity, based on the analysis of earthquake sequence, the distribution of the epicenter, the isoseismal map and the historical earthquakes. Similar to
ML4.0 earthquake in zhushan in 1988, this earthquake is of a typical sequence. Main earthquake and aftershocks all have conjugate characters. No precursory anomalies had appeared before the earthquake.
The analytic results of the completeness,availability,varying law and disturbance factors of the observations of water level and temperature of eight wells in the Three Gorges well network showed that the well water levels have significant earth tide characteristics,its sensitivity to the crustal body stress is 10
-9 -10 -10/mm,and all of them have the pressure effect and are disturbed from the rainfall to a certain extent.The dynamic state of the water temprature is so relatively stable that its daily variation amplitude is some millidegree and a part of them presents the characteristics of stepped ascent or descent during flush period.