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← GeographyWhich risk increases when a confined aquifer crosses an active fault?
A)Induced seismic activity's likelihood rises✓
B)Elevated salinity affects regional agriculture
C)Subsidence intensifies nearby reservoir impact
D)Methane clathrates destabilize near fracture
💡 Explanation
Induced seismicity risk increases because groundwater injection from aquifers near faults can reduce effective stress via pore pressure increase. Stress reduction allows slip; therefore, induced quakes are more likely, rather than just subsidence or salinity, which need different formation conditions.
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