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Geography

Which mechanism causes coastal uplift when a locked subduction fault ruptures severely?

A)Isostatic rebound from ice melt
B)Elastic rebound restoring normal shape
C)Thermal expansion of crustal rocks
D)Sediment compaction after fluid loss

💡 Explanation

When a locked subduction fault ruptures causing a large earthquake, elastic rebound occurs because accumulated strain energy is suddenly released as the overriding plate snaps back, causing coastal uplift. Therefore elastic rebound results, rather than isostatic rebound, thermal expansion or sediment compaction which involve different mechanisms or slower timescales.

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