Which risk increases when a megathrust earthquake deforms the seafloor during seafloor displacement?

💡 Explanation

When a megathrust earthquake deforms the seafloor, rapid vertical displacement occurs because of the sudden release of built-up stress, leading to the generation of a tsunami. Therefore a tsunami results, rather than storm surge amplification, landslides due to cryoseism, or coastal erosion, all of which require different environmental triggers.

• Which risk to coastal infrastructure increases when deep-sea earthquakes trigger underwater landslides near a subduction zone?
• Which scenario increases the likelihood of lahar formation following pyroclastic flow events?
• Which mechanism accelerates sediment deposition at the seaward mouth of a fjord system following deglaciation?
• Which outcome reduces floodplain biodiversity following levee construction?
• Which phenomenon causes nutrient enrichment in surface waters during coastal upwelling?
• Which outcome occurs when excessive irrigation precedes leaching?