Why do some landslides happen after earthquakes?
Quick Answer
Earthquake shaking can loosen steep slopes and reduce friction between soil, rock, and water. Once the slope fails, gravity pulls the material downhill.
The Full Story
Strong shaking can destabilize hillsides by cracking rock, shaking loose debris, and increasing pressure in water-saturated soil. If a slope is already steep or weakened by rain, an earthquake may be enough to trigger collapse. Landslides were widespread after the 2008 Wenchuan earthquake in China, which also caused many slope failures in mountainous terrain. In seismically active regions, landslides are often one of the deadliest secondary hazards after the quake itself.
Key Facts
YouTube Angle
Suggested video title for this topic:
"How a quake can turn a mountain into a moving wall of rock"
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