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Sometimes sudden vibrations of the earth's crust originate from the interior underneath and move upwards. These give rise to surface trembling of the ground, which is called earthquake.
The worst known earthquake is the Chile earthquake in 1960. The ground rose and fell in waves, objects thrown in the air, great chasm and land displacement were caused and sea waves were generated which drown hundreds of thousands of people.
Earthquake also fracture rocks anad cause them to be displaced either vertically or horizontally.
Vertical displacement may raise the sea floor, like the Moroccan sea floor from 400m deep to only 15m deep.
The worst known earthquake is the Chile earthquake in 1960. The ground rose and fell in waves, objects thrown in the air, great chasm and land displacement were caused and sea waves were generated which drown hundreds of thousands of people.
However, in this modern time the advent of technology has minimized the fatalities in earthquake disasters. With advance countries like Japan installing earthquake and tsunami warning systems to forewarn its citizens of earthquakes and Tsunami. Also the building of earthquake proof building have also gone a long way in helping during earthquake disasters.
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