The weight starts to sink into the wet sand. This phenomenon is called liquefaction. The increased pore water pressure reduces the contact forces between the sand particles, weakens the entire ...

Liquefaction takes place when tremors cause sand particles to break apart and groundwater to rise. The groundwater mixes with mud and sand as it pushes to the surface, destabilizing the ground and ...

Hills in Palu are being cleared. The soil and sand are being excavated to build the Nusantara Capital City and food estates.