Since earthquake may cause great destrucktion,we need to learn how to detect them quickly.Animals always give us warnings.For example ,before an earthquake hens would not enter their cages;rats run out from their hiding places and march fearlessly throu houses;even normally quiet dogs bark in chorus all over town.Pigeons are especially noisy and fly in unuaual patterns.And most noticeable in a chemical change in ground water before a quake.
To prevent destruction of property ,the architects design columns and horizontal beams of equal strength.Besides the efforts toimprove building structures,people also should prepare their houses for the possibility of a great earthquake.It is advisable to check and reiforce their homes regularly.And remember to place heavy objects in low positions,attach cupboards and cabinets to walls,and the like .All these precautions can make a great difference in saving lives and preventing theloss of homes