Earthquakes are caused when rock underground suddenly breaks along a fault. This sudden release of energy causes the seismic waves that make the ground shake. When two plates are rubbing against each other, they stick a little.

Most earthquakes occur along the edge of the oceanic and continental plates. Due to stress they shift and cause the earthquake. that zone is more subject to seismic disasters.

Tectonic, volcanic, collapse and explosion, are the four different types of earthquakes. A tectonic earthquake is one that occurs when the earth 's crust breaks due to geological forces on rocks and adjoining plates that cause physical and chemical changes. A volcanic earthquake is when a volcano erupts and shakes the plates.

Shallow earthquakes are between 0 and 70 km deep; and deep earthquakes, 300 - 700 km deep. In general, the term "deep-focus earthquakes" is applied to earthquakes deeper than 70 km.

S-waves arrive as secondary waves at the Earth 's surface. There is another important difference between P-waves and S-waves. Both can pass through solid rock, only P-waves can pass through gases and liquids.

Some of the effects of earthquake are businesses that might get jeopardize, people might break in and steal goods and ruin the business and that will cause economic loss, people belongings will get destroyed and many people might get injured or worse.
Tsunamis on the other hand are commonly associated with earth quakes because they are caused by earthquakes under