For Modave
Sandstone and Boryeong Shale,both of which be long to trend 2,it
is evident that one moves further away from the observations for
trends 3 and 4,and closer to trend 1.For example,for Modave
Sandstone,a very small relative length of fractures along the
weak-direction layers was observed in the interval from 0 to 30
(less than 10%).