Tsukide outcrop, MTL (Wibberley and Shimamoto 2003) | ITA observatory (this study) | ||||
---|---|---|---|---|---|
Zone | Distance from the central slip zone (m) | Description of fault zone and permeability structures | Laboratory-derived permeability data at confining pressure of 50 MPa (10−18 m2) | Corresponding laboratory or hydraulic tests | Permeability data (10−18 m2) |
1 | > 10 | Relatively unfractured Ryoke mylonite of low permeability | 4.5, 1.92 | Drillcore Samples 1 and 2 | 0.31, 0.62 |
2 | 300–0 | Variably fractured Ryoke mylonite and cataclasites of very heterogeneous permeability | 701, 228 (fractured mylonite only) | Hydraulic tests of Hole 2 | 440–1500 |
3 | 0–0.1 | A narrow central slip zone of extremely fine-grained fault gouge of very low permeability | 54, 48.6, 299, 163 | Hydraulic tests of Hole 1 | 53–500 |
4 | 0.1–15 | A 15-m-wide zone of foliated gouge | 134, 55, 20.83, 299, 4330 | ||
5 | > 15 | Metapelitic Sambagawa schist of moderately low permeability | 187 | Drillcore Samples 3 and 4 | 0.34, 0.37 |