Liquefaction is a phenomenon in which a normally solid soil behaves like a liquid

  1. Also created thru vibrations, liquefaction is one of the highest risk factors of earth quakes in Utah’s Salt lake and Utah valleys since they are built on old, ancient lake bed.

  2. I didn’t know that. Is it because fill dirt was added on top before the houses were built, or because that’s just the geography of the area?

  3. Soil liquefaction occurs when a cohesionless saturated or partially saturated soil substantially loses strength and stiffness in response to an applied stress such as shaking during an earthquake or other sudden change in stress condition, in which material that is ordinarily a solid behaves like a liquid.

  4. I got to experience this once in a pretty safe way. It was a small gravel pits waste water drain. We got something about 50 feet wide to feel like a trampoline. If you go through you will lose your shoe. In areas with extreme tides this also occurs frequently but much more dangerous and terribly sticky if you break through the top layer.

  5. This happens all the time when walking on my local beach. When I step on certain areas of sand, it looks exactly like the soil in the video. Never thought about what the science behind it was till now.

  6. They use this phenomenon as a technology in hospital beds for patients who are at high risk for, or are recovering from, pressure ulcers ("bed sores").

  7. My house in Christchurch New Zealand sank about 6 inches during our earthquake a decade ago. Friends near the river sank over a meter and had so much liquifaction come up thru the floorboards that they had mud over a meter deep in their living room.

  8. That’s why you really, really don’t want to live in a house built on fill dirt, if you live in earthquake country. Soil liquefaction can end up liquifying your house.

  9. Yes, another definition of liquefaction given in geotech classes is that it creates ‘quick conditions,’ which is to say quicksand.

  10. Also a serious risk when shipping bulk cargo. Goods like ore can liquefy, solidify again in a poor position, and take down a ship.

  11. The entire Seattle waterfront is built on unconsolidated sediment! If there was a significant enough earthquake, this would happen, and most of the infrastructure would sink.

  12. This is how Seattle gets ravaged, eventually. And everywhere else built on fill or lake beds or in the major risk zones. This scares me more than almost any other natural phenomenon.

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