Google alert failed to warn people of Turkey earthquake
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.
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After the first major 7.8-magnitude earthquake struck in the early hours of the morning, another major tremor shook the surrounding area at lunchtime.
The BBC was able to find a limited number of users who received a warning for this second quake.
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"No matter what state your phone is in, you should get that warning," Mr Berman says.
Google claims the system successfully sent alerts on 6 February to millions of people.
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In a statement given to the BBC by Google after the interview, Mr Berman said: "During a devastating earthquake event, numerous factors can affect whether users receive, notice, or act on a supplemental alert - including the specific characteristics of the earthquake and the availability of internet connectivity."