Fig. 5From: Investigation on relationship between epicentral distance and growth curve of initial P-wave propagating in local heterogeneous media for earthquake early warning systemThe average of log(B obs. /B theo. ). a a is fixed to 200Â m when the B theo. values are calculated. In this condition, locality of heterogeneities is not taken into consideration. b a is chosen from 150, 200, 600, or 1000Â m to minimize the average of log(B obs. /B theo. ) all over the observed earthquakes at each stationBack to article page