Homes collapsed when a 7.6 magnitude earthquake hit the remote Noto peninsula on New Year's Day
NERV is run by a small private firm called Gehirn - meaning brain in German - with just 13 full-time staff.
Still, its warnings of Japan's frequent earthquakes are often faster than those issued by official bodies and the country's public broadcaster, NHK.
NERV's Japanese-language account on X (formerly Twitter) has 2.2 million followers while another 35,000 people use it in English. Its app, which was launched in September 2019, has been downloaded more than four million times from both the Apple Store and Google Play.
It was created in 2010 as an account by then 19-year-old Daiki Ishimori.
X is huge in Japan and is the go-to social media platform for disaster information in the country - especially since the 2011 earthquake and tsunami.
As well as offering real-time information on earthquakes, tsunamis and volcanic eruptions NERV also provides updates on extreme weather events like typhoons, flooding and heavy snow.
The account collates and tweets out data from a number of agencies that track natural disasters - often releasing information faster than even they do.
-- Courtesy of BBC News