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← GeographyWhich outcome occurs when sediment pore pressure reduces during subduction?
A)Increased mantle wedge melting occurs
B)Episodic tremor and slip decreases
C)Accretionary wedge surface slope steepens✓
D)Trenchward forearc migration accelerates
💡 Explanation
A reduction in pore pressure increases effective stress and frictional resistance, forcing sediment consolidation via Compaction, therefore the wedge slope increases because shearing resistance dominates, rather than faulting, which alternative answers depend on.
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