Which risk escalates when ephemeral stream discharge exceeds capacity on arid-region alluvial fans?

💡 Explanation

Debris flow amplification follows excess discharge that mobilizes unstable sediment; the mechanism is positive feedback. Because of this, initial movement trigger further failures leading to larger flows; not stable sedimentation therefore.

• Which mechanism causes anomalously high tsunami run-up following a megathrust earthquake?
• Which mechanism causes the formation of oceanic gyres around subtropical regions?
• Which mechanism causes dry conditions at latitudes around 30 degrees north and south?
• Which mechanism interrupts thermohaline circulation when glacial ice melt increases significantly?
• Which outcome occurs involving mechanical weathering when freeze-thaw cycles erode slopes?
• Which mechanism causes increased tsunami amplitude following an earthquake where thrust fault rupture propagates towards the coast?