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Geography

Which 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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