Page 67 - Geothermal Energy Systems Exploration, Development, and Utilization

2.2 Geological Characterization 43

(a) Overlapping normal faults (b) Horse-tailing fault
Range-front fault
hard linkage termination

~1 km
~1 km
Geothermal
upwelling
(c) Overlapping opposing (d) Dilational fault
normal-fault systems intersection

Geothermal
upwelling
~1 km
~5 km

Figure 2.1 Examples of favorable structural normal faults, whereby faults break up into
settings for geothermal systems. Areas of multiple splays or horsetail. (c) Overlapping,
upwelling geothermal fluids are shaded in oppositely dipping normal fault systems that
dark gray. (a) Stepover between two over- generate multiple fault intersections in the
lapping normal fault segments with multiple subsurface. (d) Dilational fault intersection
minor faults providing hard linkage between between oblique-slip normal faults.
two major faults. (b) Terminations of major