Fig. 11
From: Preparation zones for large crustal earthquakes consequent on fault-valve action
a Schematic of hydrothermal fluid flow (arrows) inferred for an amplifying anticlinorial dome structure within the Upper Ordovician turbidite sequence of the Bendigo–Ballarat area of the Lachlan fold-belt of Victoria, Australia (after Cox et al. 1991; Willman 2007); b structural and inferred stress controls on Au–quartz vein systems (black) developed within similar upright fold structures in the Lachlan fold-belt (after Cox 1995; Sibson and Scott 1998; Willman 2007; Sibson 2020); c schematic of dextral strike–slip fault zone with a local dilational jog: fluid focusing occurs within ductile shear zones which flare outwards below the base of the seismogenic zone (b.s.z.) and within the enhanced permeability of the dilational stepover which acts as a pipe conduit