The relationship between secondary jointing and faulting, and major faults
was investigated using a regression analysis of average separation of joint
s and secondary faults versus distance from the closest major fault. The an
alysis was carried out on 95 granite outcrop localities in Calabria, Southe
rn Italy. The main result of the regression analysis is expressed by: s = 0
.013d(0.457) where s is the average apparent separation, and d is the dista
nce from the closest master fault. All values are expressed in meters. The
correlation coefficient was r = 0.95, and the probability of the null hypot
hesis was 0.00. Both data sets range over one order of magnitude, thus the
result of the analysis is reliable. (C) 2000 Elsevier Science B.V. All righ
ts reserved.