Which mechanism causes rapid stream incision following an earthquake along a strike-slip fault?

💡 Explanation

When a strike-slip earthquake vertically displaces the landscape across the fault, vertical offset creates a local base-level drop because stream thalweg is suddenly much higher relatively, incentivizing downcutting and stream incision. Therefore fault displacement causes base-level lowering, driving rapid incision, rather than increased sediment, weathering, or reduced flow, which are secondary or independent effects.

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