1. The point inside the crust where the pressure is released is called the focus . The point on the Earth's surface above the focus is called the epicentre . Earthquake energy is released in seismic waves.
2. The magnitude of an earthquake is related to the total area of its fault rupture. ... When a fault ruptures unilaterally (with the epicenter at or near the end of the fault break) the waves are stronger in one direction along the fault.
