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Which geological outcome arises when increased pore water pressure weakens fault zone material along a transform fault?

A)Accelerated creep rate along fault line
B)Decreased magnitude of subsequent earthquakes
C)Increased frequency of aftershocks
D)Episodic tremor and slip events (ETS)

💡 Explanation

When pore water pressure increases, the effective normal stress on the fault decreases because fluid supports some of the load, reducing frictional resistance and triggering Episodic Tremor and Slip (ETS). Therefore, ETS events occur, rather than creep, magnitude decreases, or aftershock increases all of which require stable conditions or larger energy release from single ruptures.

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