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Table 2 Calculated linear fracture frequency for three intervals in FFC-1

From: Evaluation of deep geothermal exploration drillings in the crystalline basement of the Fennoscandian Shield Border Zone in south Sweden

Borehole depth Interval thickness Number of fractures Linear fracture frequency, frac/m Volumetric fracture density, m2/m3
2150–2450 m 300 m No reliable data
2450–2562 m 112 m 181 1.62 2.67
2562–2695 m 133 m 329 2.49 3.39
2695–3106 m 411 m 353 0.85 1.68