Figure 5 shows the results of the magnetic measurements
and descriptions of cores. Cores No. 1 and
No. 2 consist of unweathered Funatsu granite and
cataclastic granite with clay seams in the fracture. The
andesitic dyke with clay seams has intruded into core
No. 2. The averaged magnetic susceptibilities at a
depth of 30 m in core No. 1 and at a depth of 50 m in
core No. 2 is 1.1 × 10-3 SI and 1.2 × 10-3 SI, respectively.
A high average magnetic susceptibility of 1.3–
1.7 × 10-3 SI is observed in the Funatsu granite. Conversely,
the susceptibilities of the cataclastic Funatsu
granite and andesitic dyke are a low average of 2.7–
4.2 × 10-4 SI and 4.4 × 10-4 SI, respectively.