Why does liquefaction happen during earthquakes?
Quick Answer
Shaking can raise water pressure in loose, saturated sand until the grains lose contact and the ground temporarily behaves like a liquid. Buildings can then sink, tilt, or slide.
The Full Story
Liquefaction occurs in waterlogged sandy or silty soils when earthquake shaking increases pore-water pressure. The sediment grains stop supporting each other effectively, so the ground loses strength and starts behaving more like a fluid than a solid. This can cause sand boils, tilted buildings, broken pipes, and sudden ground settlement. Liquefaction was a major problem during the 1964 Niigata earthquake in Japan and the 1964 Alaska earthquake. It is one reason why soil type matters so much in earthquake risk.
Key Facts
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Suggested video title for this topic:
"How can solid ground suddenly act like quicksand in an earthquake?"
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