Why are earthquakes monitored worldwide instead of in earthquake-prone areas only?

As you may already know, the energy of earthquake waves is carried worldwide by seismic waves. These waves travel throughout the earth and also carry information with them about the matter via which they travel.

A lot of information about the Earth's crust comes from observing and monitoring these seismic waves.

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explanation:

because the sun creates the shadows and its only what people on earth see in the sky which are the phases of the moon.