Earthquake

Earthquake is the sudden and temporary vibration of earth surface ranging from a fair tremor to a wild motion due to sudden release of energy from rocks beneath the earth surface.

Causes of earthquake
1.Non-tectonic causes:The cause that occur on the earth surface.
a)Surface cause
-large scale rock falls on the loose ground or landslide
-dashing of sea wave along coast
-water falls
-working of heavy machinery in industrial area;underground explosion of bombs;passage of tanks ; failure of dams etc.

b)Volcanic causes
-explosion of volcano with the release and expansion of hot gasses and lava.
-faulting within the volcano resulting from pressure in the chamber of malted rock.

c)Collapse of subterranean
-sometime due to removal of support from below by the reaction of underground water ground surface collapse and cause earthquake.

2.Tectonic causes
About 95% of earthquakes are due to sudden earth movement along existing or new fault. Earthquake caused by faulting or folding in the crust are known as tectonic earthquake.It can be said that the causes that occurs beneath the earth surface are called tectonic causes.This type of earthquake release huge amount of energy and cause huge damage.