Google's earthquake warning system failed to get to many Turkish residents before February's deadly tremor, a BBC Newsnight investigation has found.

Axar.az reports citing foreign media.

Google says its alert system can give users up to a minute's notice on their phones before an earthquake hits.

It says its alert was sent to millions before the first, biggest quake.

However, the BBC visited three cities in the earthquake zone, speaking to hundreds of people, and didn't find anyone who had received a warning.

The system works on Android phones, essentially any phone that isn't an iPhone. Android phones, which are often more affordable, make up about 80% of the phones in Turkiye.

"If Google makes a promise, or makes an implicit promise, to deliver a service like earthquake early warning, then to me, it raises the stakes," says Prof Harold Tobin, director of the Pacific Northwest Seismic Network.

"They have a responsibility to be able to follow through on something that is directly related to life and limb."

Google's product lead on the system, Micah Berman, insisted it had worked. "We are confident that this system fired and sent alerts," he told the BBC.

However, the company did not provide evidence that these alerts were widely received.

More than 50,000 people died in February's earthquake.