How are earthquake foci distribution relative to plate boundary?

Answer 1

Earthquakes are the planets way of relieving stress.

Earthquakes can occur at all types of plate boundaries, however the larger earthquakes tend to occur at transform and convergent boundaries. At these plate boundaries, one plate gets pushed under or into (convergent) or past (transform) the other. As this happens the two plates can become locked in place due to friction. This causes deformation of the rockmass around the boundary as the plates continue trying to move. As the stress builds up and the amount of deformation increases, the amount of energy stored in the rocks also increases (this is a lot like a compressed spring).

Ultimately the stress will get so large it will exceed the frictional resistance and shear strength of the rock at the plate boundary causing a sudden movement. This allows all the energy to escape in one go in the form of seismic waves causing an earthquake.

As the majority of stress within the earth's lithosphere build up at plate boundaries this is also where the majority of earthquakes occur.

Answer 2

Your dog licks your nose off then defecates on it.

Answer 3

Most earthquakes are located where two tectonic plates meet. The shifting of the plates cause the shaking of the surface.

Answer 4

Plate boundaries and earthquake foci are related because the vast majority of earthquakes are near plate boundaries. That is the area of the most activity.

Answer 5

The ring of fire; located in the border of Pacific plate which, is a much weaken crustal area with volcanic hot spots.

Answer 6

Earthquakes happen when the pressure from two tectonic plates pushing against each other at their boundaries is too much, and the plates 'slip', causing violent vibrations in the earth.