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IMPORTANT FACTS ABOUT EARTHQUAKE

                                                    An earthquake can be defined as a movement or tremor of the earth’s crust which originates naturally and below the surface. It sometimes causes a permanent change of level at the surface, but often the damage done by the shaking provides the only lasting visible effect.            It can be produced by a volcanic explosion; earthquakes, in fact, are common in most volcanic areas , and often precede or accompany eruptions. It is more likely, however, to be of Tectonic origin, and probably due to the existence of a Fault.           At least three distinct sets of waves are set up by an earthquake, and at a considerable distance from the place of origin, however, they all reach an observer at approximately the same time. As these waves pass a place, the ground may be felt to rock, and buildings sway backwards and forwards. Maximum damage is not done always at the Epicenter, where the movement is up and down , but at places