A team of experts said Wednesday it has detected geological layers that indicate the Kii Peninsula has been hit by huge tsunami every 400 to 600 years since around 8,000 years ago.

The tsunami are believed to have been on a scale comparable with those caused by a huge earthquake in 1707, according to the researchers at the National Institute of Advanced Industrial Science and Technology and other organizations.

The study indicates the arrival of the next huge tsunami may not be very far away.