Which mechanism causes increased lahar risk downstream from a stratovolcano after a heavy rainfall event?

💡 Explanation

During a heavy rainfall event, glacier meltwater combines with loose volcanic ash and debris on the slopes of a stratovolcano causing debris flow, increasing lahar hazards. Therefore glacier meltwater mobilizing loose ash is the correct consequence, rather than destabilization, weakening, or uplift, which involve different triggers.

• Which mechanism reduces surface salinity in North Atlantic Deep Water formation zones?
• Which mechanism causes increased crustal deformation during megathrust earthquakes?
• Which outcome typically occurs when a transform plate boundary impedes subduction?
• Which outcome occurs when increased pore fluid pressure in a fault zone exceeds lithostatic stress?
• Which phenomenon increases when volatiles are introduced into a subduction zone mantle wedge?
• Which consequence typically results when concentrated animal feeding operations (CAFOs) are established on karst landscapes?