A 6.8-magnitude earthquake struck southwestern Japan on Monday night, sparking tsunami warnings but causing no reported injuries or damage. The quake occurred at a depth of 36 kilometers, approximately 18 kilometers off the coast of Miyazaki Prefecture in the Kyushu region at 9:19 PM local time.
The Japan Meteorological Agency (JMA) issued a tsunami advisory, warning of possible waves up to one meter high and urging the public to avoid coastal areas. In a statement on X, the JMA emphasized, “Tsunami can strike repeatedly. Please do not enter the sea or go near coastal areas.” Two minor tsunamis of around 20 centimeters were detected at regional ports, but there were no visible signs of destruction.
Local media and public broadcaster NHK showed calm seas and normal operations in the region, with vessels and traffic running smoothly.
Japan’s Seismic Activity
Japan, situated at the convergence of four major tectonic plates, is among the world’s most seismically active nations. It experiences approximately 1,500 earthquakes annually, accounting for about 18% of the world’s quakes. Most are minor, but the damage they cause can vary depending on their depth and location.
The nation remains vigilant following past devastating earthquakes, including the catastrophic 9.0-magnitude quake in 2011 off northeastern Japan. That disaster triggered a massive tsunami, leaving about 18,500 people dead or missing and causing the Fukushima nuclear meltdown, Japan’s worst post-war disaster.
In more recent years, Japan has seen several powerful quakes, such as the March 2022 7.4-magnitude tremor off Fukushima that killed three people and the New Year’s Day 2024 7.5-magnitude quake on the Noto Peninsula, which claimed nearly 470 lives.
Preparedness and Response
Japan’s strict construction codes and routine emergency drills are designed to mitigate the impact of such disasters. The country remains haunted by memories of the Great Kanto Earthquake of 1923, which devastated Tokyo, and continues to prepare for the possibility of another megaquake.
The JMA is investigating potential connections between Monday’s quake and past seismic activity, including subduction megathrust quakes, which have historically caused massive tsunamis.
While Monday’s earthquake brought no immediate harm, it serves as a reminder of the ever-present risks posed by Japan’s tectonic location and the need for continued vigilance and preparedness.
