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← GeographyWhich risk increases when a megathrust fault locks?
A)Greater accumulated fault stress✓
B)Increased mantle convection forces
C)Lower asthenosphere magma viscosity
D)Decreased plate boundary lubrication
💡 Explanation
Locked megathrust faults store elastic energy because frictional resistance prevents slip; therefore, accumulated fault stress increases the likelihood of large magnitude earthquakes, rather than reduced mantle or lubrication contributing to the stress buildup.
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