Which risk increases when a descending oceanic plate accumulates volatile-rich sediments along a subduction zone?

💡 Explanation

Seamounts increase earthquake risk at subduction boundaries because increased pore fluid pressure results from volatile release. The mechanism, effective stress reduction, amplifies fault slip area and magnitude, therefore raising earthquake hazard, rather than other hydrological-related effects.

• Which risk significantly increases in Arctic regions during periods of thawing permafrost due to solifluction?
• Which risk increases within fjord sediment when reduced tidal flushing occurs?
• Which outcome occurs when artificial levees constrict a major river's channel?
• Which outcome occurs when abundant rainfall causes extensive soil leaching in vegetated volcanic slopes?
• Which outcome typically occurs offshore during subduction initiation?
• Which mechanism causes localized crustal uplift when fluids are released during subduction?