Which of the following statements are correct?

I. In earthquakes, shocks are generated at a point known as the epicentre. II. The point of origin of shock may be within the crust or mantle. III. Most earthquake-prone areas are at the margins of tectonic plates.

The point of origin of shock may be within the crust or mantle, and most earthquake-prone areas are at the margins of tectonic plates. There are two main causes of earthquakes. Also, statement I is not correct. The point where earthquake shocks are generated is called its "Focus". The point directly above the "Focus" on the earth's surface is its "Epicentre".