"Table 9.óResults of fracture-density measurements based on SEM-image analysis of core samples obtained in this study [Rcssn, surface recession; sigma, standard deviation. Ecldn Length, Euclidian length of trace of exposed surface, measured along regression line through trace from end to end. D, in (D-1)*100, Richardson dimension (see app. 7). Crossings, number of crossing of trace of exposed surface over regression line through trace. Dev, standard deviation of trace of exposed surface. Pixel count, number of pixels in trace of exposed surface used in computing the shape factor. Grn size, estimated average grain size, using calipers provided by ěLossî option from menu of program EDGE. Note that the distance between calipers as reported on monitor is based on the assumption that the SEM image magnification is 10X; if other than 10X images are used for analysis, valued reported by program should by multiplied by the factor 10/actual magnification. For most samples, two values are listed for grain size: the first is the average grain size in the first 50 mm of exposed surface, and the second is the average grain size ",,,,,,,,,,

"in the region deeper than 150 mm below the surface. If only one value is listed, no observable difference was noted in the perceived grain size with depth into the sample. FD, fracture density. Two values are listed: the first is the fracture density near the surface, and the second is the fracture density deep into the sample. N/L, pixel count divided by Euclidean length (in pixels). Frgnness, fractal dimension of trace of exposed surface. Rel Hausdorf, for discussion of the Hausdorf measure, see Peitgen and others, 1992. Shape factor, measure of surface roughness derived for this study (see app. 7)]",,,,,,,,,,



Image analysis data of core:,GCRA1,,,,,,,,,

,,,,,,,,,,

,A,B,C,D,Avg(BCD),E,F,G,Avg(EFG),

Rcssn (mm) (D/S),,,,,,,,,,

     (Dirct//Smooth),*75+-50//55+-35,,,,,,,,,

Rcssn (sigma),,,,,,,,,,

Ecldn Length (cm),,22.50,22.50,22.50,,22.50,22.50,22.50,,

Ecldn Length (pix),,512,512,512,,512,512,512,,

(D-1)*100,,5.90,3.80,17.90,9.20,8.00,4.70,2.40,5.03,

Crossings,,4,6,15,8,6,9,2,,

Dev (sigma),,608,428,549,528,532,464,325,440,

Pixel count,,733,1050,1372,1052,834,696,620,717,

,,,,,,,,,,

Grn size (100 mm),,*,*,*,0,*,*,*,0,

Grn size (300 mm),,*,*,*,0,*,*,*,0,

FD (%) at surface (100 mm),,2,19,48,23,12,10,3,8,

FD (%) subsurface (300 mm),,2,10,38,17,12,4,3,6,

,,,,,,,,,,

N/L,,1.43,2.05,2.68,2.05,1.63,1.36,1.21,1.40,

FRghness = ((N/L)D-1)*100,,46,111,220,126,69,38,22,43,

,,,,,,,,,,

Rel Hausdorf,,0.98,0.95,1.07,1.00,0.98,0.98,0.98,0.98,

Shape factor,,2.61,3.69,5.22,3.84,3.00,2.46,2.16,2.54,

,GCRA1A,GCRA1B,GCRA1C,GCRA1D,GCRAo,GCRA1E,GCRA1F,GCRA1G,GCRA,