|Causes of Earthquakes|
Earthquakes usually occur along a fault line. What is a fault? It is a
fracture in the earth's rocky outer shell where portions of rock slide
past each other. The shaking of an earthquake is the result of the stress
on large blocks on that lie along a fault thus making it strain or bend.
There are 3 types of faults in motion. They are the strike-slip fault,
normal fault and the thrust fault. A displacement of faults of any type
could be the accumulation of smaller displacements of individual
Different faults is connected to the force of an earthquake. Normal
faults usually cause small earthquakes while thrust faults and strike-slip
faults usually cause large earthquakes.
Movement of plates also cause earthquakes. It allows build-up of