Question

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

Answer 1

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.

Cheers!

Answer 2

Earthquakes are monitored worldwide because we never know when they will occur, they can happen everywhere in the world even in the areas that are far away from the tectonic plates boundaries. That is why earthquakes are monitored worldwide instead of in earthquake-prone areas only.