explain why the intensity of the shock waves could felt as far as blantyre en zomba that is about 115 km and 150 km from the epicenter ?

The seismic waves can be felt form large distances and can travels 6 km per second.

Explanation:

As the shocks waves travel faster than sound waves their speed increases with the increase in amplitude and thus energy is expanded in the medium in which it travels. The epicenter sends out the waves that act like large objects dropped on still waters and these seismic waves tend to ripple through the surface, can travel 2 miles per second in granite rocks.