Which mechanism causes increased coastal subsidence during an earthquake along a subduction zone lacking sediment?

💡 Explanation

When an earthquake ruptures along a subduction zone, elastic rebound occurs because previously stored energy is released, causing both uplift and subsidence as the deformed crust snaps back. Therefore subsidence occurs, rather than mantle rebound, sediment redistribution, or aquifer compaction, which involve distinct geological processes unrelated to sudden fault motion.

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