Japan has issued its first-ever warning of an increased risk of a major earthquake, following a 7.1 magnitude tremor off the southern island of Kyushu.

The warning, issued on Thursday, advises residents to be alert but not to evacuate.  

The epicenter of the 7.1 quake was located at the edge of the Nankai Trough, a seismic hotspot known for producing devastating earthquakes. Experts warn of a 70-80% chance of a magnitude 8 or 9 quake striking the trough within the next 30 years. Such an event could result in catastrophic damage and a massive tsunami.  

While emphasizing that a major quake is not imminent, Japanese officials have urged residents to prepare by checking evacuation routes and ensuring adequate supplies. The warning will remain in place for a week.  

The country has a history of powerful earthquakes, most notably the 2011 Tohoku earthquake and tsunami, which caused widespread devastation. (ILKHA)