Second earthquake hits after more than 1,700 killed in Turkey and Syria

The death toll from the first earthquake has risen to 1,121 in Turkey, according to the country's disaster agency.

This brings the overall number of fatalities from the earthquakes in Turkey and Syria to more than 1,900, as the latest figures from Syria estimate that 783 people have been confirmed dead.

The number of casualties is expected to continue rising as rescuers search for survivors.

It's unclear yet how many people died as a result of the second tremor - if any at all.

The "sheer magnitude" of the initial 7.8-magnitude quake today is larger than has been seen in Turkey for "hundreds of years", according to a professor of geophysics who studies seismic activity in the Middle East.

Speaking to Radio 5 Live's Naga Munchetty, Martin Mai from the King Abdullah University in Saudi Arabia says there is currently "no way" to predict earthquakes.