SEISMIC MULTI-FRACTAL CHARACTERISTICS IN MINES AND SEISMICITY PREDICTION
TANG Lizhong1，2，K. W. XIA2，LI Xibing1
(1. School of Resources and Safety Engineering，Central South University，Changsha，Hunan 410083，China； 2. Department of Civil Engineering，University of Toronto，Toronto M4Y 1R5，Canada)
Abstract：The characteristics of the fractal of seismicity in mines play an important role in the establishment of a nonlinear dynamics of seismicity in mines for prediction of seismicity. With seismic data detected in Dongguashan Copper mine，the fractal dimensions of spatial distributions of seismic hypocenters were calculated in the generalized correlation integral，and the fractal dimensions of energy of seismic events were calculated in the relation between b-values in the Gutenberg-Richter law. The fractal structures of seismicity in the mine and their temporal spectra were researched by means of multi-fractal theory，combining with the mining activities and mining engineering structures. The results show that seismicity in the mine has multi-fractal，and the heterogeneity of fractal structure of seismicity is of mining activity and engineering structure. Only if the fractal structure of seismicity in a space for fractal calculation is relative homogeneous，its fractal dimensions can be adopted to effectively predict seismicity. This space for the fractal calculation generally has few sorts of mining activities and simplex engineering structure，and the fractal dimensions of spatial distribution of seismic epicenters reflect the state of the induced seismicity. The temporal spectrum has an obvious precursor of main shock and is suitable for seismicity prediction，but the has no obvious precursor of main shock and is not suitable for seismicity prediction.
