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.
“There was in the scientific community a hope and effort in the 1970s and 80s to say earthquakes can be predicted, all these theories ideas did not hold,” he says, adding countries can’t “predict” or “prevent” earthquakes – only “prepare”.
Mai adds that the second earthquake on a separate fault line today was likely triggered by the first.
“This tectonic plate has been loaded over the last decades, or centuries, and probably it was ready to go and the earthquake this morning pushed it over the edge,” he says.
Fires along gas pipelines apparently triggered by quake
Videos have emerged showing large fires bursting into the air in southern Turkey, with people claiming the earthquake has caused gas pipelines to burst and burn out of control.
Turkey’s energy minister Fatih Donmez said this morning that there had been serious damage to the country’s energy infrastructure, including gas pipelines near the epicentre, but he did not specifically mention explosions.
The BBC has verified one of the videos as being on the outskirts of the city of Hatay, 170km (105 miles) south-west of Gaziantep, where the earthquake struck.
In the video the tree lines and buildings match satellite images of the Amik valley near Hatay.
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We also know there are gas and oil pipelines in the region from official maps.
Turkish TV crew witness second quake
We’re starting to hear more about the second earthquake which struck Turkey today.
Video from Reuters shows the moment a camera crew run away in panic as a building collapses, while they’re live on air. A crashing sound follows, as well as huge clouds of dust.
The reporter, Yuksel Akalan, later said he and his team were in the city of Malatya filming the search and rescue effort when a building near him was “brought down to Earth”.
In the video, screams can be heard as people run down the road. Mountains of rubble are seen once the dust settles slightly.
We’ll continue to bring you more on this second quake as we get it.
BBC