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← GeographyWhich risk increases when hydrostatic pressure decreases unexpectedly during fault lubrication processes?
A)Increased fault creep rate
B)Reduced seismic wave velocity
C)Propagation of dynamic rupture✓
D)Halting of mineral precipitation
💡 Explanation
Dynamic rupture propagation increases as hydrostatic pressure decreases because effective normal stress on the fault increases, promoting frictional instability; this process is termed 'fault weakening'. Therefore, rupture occurs rapidly, rather than slow creep, generating seismic waves.
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