Studies on the Multifractals of Time and Space Clustering of Earthquakes

In order to explore the predictability of earthquakes, the distribution characteristics of seismic activity in time and space for Huabei and Tangshan area are studied by multifractal theory and box-counting method. The generalized dimensions d(q) of seismic activity energy are estimated, and the geometry structure of multifractal spectrum of them is also analyzed. The results showed that the values of the generalized dimensions are obviously low, and there is a low value process before the large earthquake occurrence and the f(α) spectrum is partial to right. A similar characteristic is found in Tangshan area. The anomalous phenomena revealed the physics essence and some instability before interior crisis of seismogenic system.