Earthquakes are located mostly in long, narrow belts, along all types of plate boundaries (or margins) as shown on this map.
Volcanoes and earthquake activity often occur in similar places in narrow zones of activity, as shown on the map. These zones include:
There are however some important exceptions. The Hawaiian Islands, which are entirely volcanic in origin, formed in the middle of the Pacific Ocean, more than 3,200 km from the nearest plate boundary. This is explained by the 'hotspot' theory.