Which risk increases near subduction zones following a major shallow-focus earthquake?

💡 Explanation

When a major shallow-focus earthquake occurs at a subduction zone, rapid seafloor displacement occurs because of the fault rupture, generating a tsunami. Therefore, the risk of a tsunami increases, rather than eruptions, liquefaction, or landslides which can be triggered but are secondary effects and less directly caused by the plate displacement.

• Which thermal effect causes increased stratification when freshwater runoff alters coastal circulation?
• Which mechanism limits upwelling within subtropical gyres despite persistent wind forcing?
• Which outcome results as increased sediment load alters braided river morphology transversing an alluvial plain?
• Which mechanism causes tsunami formation when a megathrust earthquake occurs at a subduction zone with shallow dip angle?
• Which climatic consequence results when increased glacial meltwater flow amplifies coastal stream discharge?
• Which mechanism primarily contributes to increased sedimentation rates when straightening a meandering river nearing oxbow stage?