Figure F11.
Fracture (A) dip and (B) strike from
resistivity-at-the-bit image interpretation, Leg 196 Hole 808I. Fracture strike
is plotted so that the dip direction is 90° counterclockwise from the strike
(right-hand rule). C. Fault frequency from core analysis, Leg
131 Site 808. Fracture intensity at Hole 808I increases markedly at the frontal
thrust zone (389-414 mbsf), fractured interval (559-574 mbsf), and slightly at
the décollement zone (~937-965 mbsf). All three zones coincide with increases
in fault frequency identified within cores (C), although the frontal thrust zone
appears to be slightly shallower in Hole 808C (Leg 131). Fractures are
predominantly east-northeast-west-southwest striking, particularly within the
frontal thrust zone and fractured interval. Fractures are more randomly
orientated at depths >600 mbsf, with a dominant north-south orientation
within the décollement zone. Fractures are dominantly south-dipping within the
frontal thrust zone and major fractured interval and west-dipping within the
décollement zone.