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← GeographyWhich mechanism increases the risk of induced seismicity near a deep geothermal energy extraction well?
A)Pore pressure increase along existing faults✓
B)Thermal stress fracturing of reservoir rock
C)Chemical precipitation within fracture networks
D)Groundwater depletion from aquifer drawdown
💡 Explanation
When fluid reinjection occurs in geothermal operations, pore pressure increases within subsurface rock formations; this lubrication reduces friction on pre-existing faults, promoting slip and generating earthquakes. Therefore pore pressure increase is the risk mechanism, rather than fracturing, precipitation or drawdown each requiring alternate processes.
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