where are volcanoes and earthquakes likely to occur on the earth
The largest earthquakes on Earth occur at the interface between the two plates, called the megathrust. Recent examples include the magnitude 8.8 earthquake in Chile in February 2010 and the magnitude 9.1 earthquake offshore Sumatra in December 2004; the latter triggered a devastating tsunami.
Volcanoes result when magma rises to the Earth's surface. One process that results in magma being formed, is the melting of tectonic plates being subducted. Therefore, most volcanoes are likely to occur along convergent or divergent tectonic plate boundaries. Diagram of the Pacific Rim of Fire.