Evolution of the temporal multifractal scaling properties of the Chiayi earthquake (MLÂ =Â 6.4), Taiwan

► Temporal generalized fractal dimension (Dq) was used to study the seismic cluster of Chiayi earthquake (ML = 6.4), Taiwan. ► Dq curve is smooth in the background stage. ► Dq curve exhibits greater variability especially for the steep slope at q = 0 during the foreshock stage. ► The fluctuation of Dq is large and the multifractal degree is up to 1 in the aftershock stage. ► The variation of the slope of Dq curve at q = 0 may be used as a precursor of a large earthquake.