Tectonic activities mostly occurs at or near the areas closer to the surface of earth where tectonic plates meet.
Step-by-step explanation:
Both earthquakes and volcanic eruptions frequently occurs in same areas because both are often created by the subduction of oceanic crust.
On the basis of this theory, the earth's crust is made up of continental and oceanic plates which continues to move across the surface of the planet, meeting at plate boundaries.
Volcanic activity occurs at two types of plate boundaries: mid-ocean ridges and subduction zones.