why does body waves travel through the earth ? and if they travel ,then why an earthquake doesn't cause destruction to whole planet instead of causing destruction at place above focus from where energy is released ??!!

Dear Student, Body waves depend on the density and modulus, that are the material properties of earth. These properties vary on the basis of temperature, composition and material phase of Earth. The Earthquakes occur due to collision of tectonic plates present deep inside the Earth. So, the energy is released at the point where tectonic plates collide and hence, causing destruction only at that particular place. Regards

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