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A rescue operation is underway across much of southern Turkey and northern Syria following a huge earthquake that has killed more than 2,300 people. The 7.8 magnitude quake struck near Gaziantep in the early hours of Monday while people slept. A second 7.5-magnitude quake hit at around 13:30 local time. How unusual is an earthquake of this magnitude - and what does a magnitude of 7.8 actually mean? Stephen Hicks, a seismologist at University College London, puts it into perspective. (Photo: Rescue workers and volunteers conduct search and rescue operations in the rubble of a collapsed building, in Diyarbakir. Credit: Getty Images)