| Abstract: | The R/S analysis method of time series was suggested by Hurst in 1965, then it was used tostudy the fractional Brownian motion(FBM) and the self--affinity of natural phenomena (MandeLbrot and Wallis, 1969a 3 Feder, 1988). In this paper, we use R/S analysis method to study thechsnges of Hurst exponent H of time interval sequences Of earthquakes with time variations for 5r%ions as follows: Wuqia (38"--41"N, 73"- 77 "E, M.>3' 5) I Tangshan (38"-41"N,116. 5"-- 119. 5'E, ML 2 3); Longling (23"- 26"N, 97"-- 100'E, ML > 3); Songpan (31"- 34"N,102. 5"- 105. 5"E, ML;3); China and its vicinity (20"- 50"N, 73"-129"E, M,>5), andmake an attempt to find features of anomalous variations of H values before the moderate strongearthquakes. |
