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← GeographyWhich outcome occurs when increased pore fluid pressure in a fault zone exceeds lithostatic stress?
A)Reduction in tectonic plate motion
B)Accelerated seismic wave propagation
C)Increased frequency of induced seismicity✓
D)Enhanced ductile deformation of crustal rocks
💡 Explanation
When pore fluid pressure exceeds lithostatic stress, effective normal stress decreases because the frictional resistance to fault slip is reduced, thus increasing the likelihood of induced seismicity. Therefore, increased frequency of earthquakes/seismicity results rather than plate motion reduction or changing wave propagation, which are governed by different parameters.
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