Turkey earthquake: Where did it hit and why was it so deadly?

Tens of thousands of people have been killed and scores more injured by a huge earthquake which struck south-eastern Turkey, near the Syrian border, in the early hours of Monday morning.

The first earthquake was big as 7.8, classified as "major" on the official magnitude scale, broke about 100km (62 miles) of fault line, causing serious damage to buildings near the fault.

This incident occurred in the early hours of the morning, when people were inside and sleeping. The sturdiness of the buildings is also a factor.

The Earth's crust is made up of separate bits, called plates,  These plates often try to move but are prevented by the friction of rubbing up against an adjoining one.

the 19th Century earthquake resulted in immense damage to towns in the area, with 7,000 deaths recorded in the city of Aleppo alone. Damaging aftershocks continued for nearly a year.

The Turkish earthquake at 7.8 is classified as major and usually causes serious damage, as it has in this instance.

Anything above 8 causes catastrophic damage and can totally destroy communities at its centre.