Which risk increases when a megathrust earthquake occurs along a subduction zone lacking strain partitioning?

💡 Explanation

When a megathrust earthquake occurs without strain partitioning, accumulated stress is released suddenly across a large fault area because the inter plate boundary has high friction. This generates a large vertical displacement of the seafloor, causing an increased tsunami risk. Therefore, tsunami hazard results, rather than caldera formation, orogenic uplift, or continental rifting, which depend on different tectonic processes.

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