Sangeetha Pulapaka

I will answer this. But first, why did you change your grade? You went 4 grades down!  

Earthquakes are the result of forces deep within the earth's interior. Sudden break within the upper layers of the earth, sometimes breaking the surface, resulting in the vibration of the ground, which where strong enough will cause the collapse of buildings and destruction of life and property. 

The above is a tectonic map of the global plate.

They strike with no early warning and can be devastating, but after a major one, aftershocks may be as strong as a new earthquake. Earthquakes usually happens along a fault plate, the border between plates:

Earthquakes often trigger landslides, tidal waves and tsunamis. Powerful aftershocks frequently occur, causing further damage and increasing psychological stress.

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.

Crustal or Shallow Quakes - In this intense shaking occurs near the epicenter but usually diminishes quickly with distance relative to the other earthquake types.

Intraplate or Deep Quakes- occur at depths of 30-70 km in oceanic crust as it dives under lighter continental crust. Because of the depth, even buildings located right above them are far enough away that ground motions are attentuated. The 2001 Nisqually Earthquake was a deep quake

In all earthquakes are unpredictable and cause a lot of havoc.

Manomay Shravage
I went four grades down? Maybe it was a mistake.