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Fig. 26 | Geothermal Energy

Fig. 26

From: Geologic framework of the Fang Hot Springs area with emphasis on structure, hydrology, and geothermal development, Chiang Mai Province, northern Thailand

Fig. 26

Models of fracture systems associated with a left-lateral fault (one can use reverse images to view features of a right-lateral fault). a Attributes and features associated with stepover zones (after Micklethwaite et al. 2010). b Internal architecture of a strike-slip fault showing fault core of cataclastic rock, gouge, and slip surfaces, and the surrounding damage zone (after Aydin and Berrymore 2010); c Angular relations of fracture patterns along a left-lateral fault oriented with a 060° strike of the Mae Chan fault. Extensional (open) fractures should parallel the maximum principle stress, σ1. The intermediate stress σ2 is vertically down. The least principle stress is σ3. Diagram is from Christie-Blick and Biddle (1985). d Zone of “tensile fractures” (open extensional fractures or cracks) expected at the tip of a left-lateral fault. Kim and Sanderson (2006) call this a zone of “wing cracks” because of the pattern over which they splay near the tip of the fault. For a system that propagates some distance from the fault, the term “wing fractures” may be more appropriate. Diagram based on concepts of fault tips in Gudmundsson (2000), Kim et al. (2004), Kim and Sanderson (2006), and Curewitz and Karson (1997). Pattern of tensile stress at the tip of a left-slip fault is from Reches and Lockner (1994)

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