Constructors should built the houses without any loose material that makes the concrete loose when some destruction is going to be held and to prevent thi type of  destruction
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A great earthquake has stroke in Japan of a Richter scale measuring 7.6 so a lot of harm has occurred to buildings,lives and property.So the Japan government has devised a way to remove loss of harm to buildings.
They have now begun to make buildings which have a flexible string at the building which when earthquakes occur they will not fall down and break into pieces.
They have also put on a warning bell which senses any movement in the Earth's crust.