5.5 Magnitude Earthquake Strikes Gunma and Saitama Prefectures in Japan; No Tsunami Risk

By  Noh Yujin  | Jun 16, 2026

5.5 Magnitude Earthquake Strikes Gunma and Saitama Prefectures in Japan; No Tsunami Risk
▲ A 5.5 magnitude earthquake struck southern Gunma Prefecture and northern Saitama Prefecture in central Honshu, Japan, at approximately 7:46 p.m. on June 16.

A 5.5 magnitude earthquake occurred in southern Gunma Prefecture and northern Saitama Prefecture in central Honshu, Japan, at approximately 7:40 p.m. today.

The epicenter was located at 36.10 degrees north latitude and 139.90 degrees east longitude, with the hypocenter estimated to be in southern Ibaraki Prefecture at a depth of 50 km.

The earthquake registered a seismic intensity of 5-lower in areas including Ota City in Gunma Prefecture.

Unlike "magnitude," which measures the absolute energy of an earthquake, the seismic intensity scale used by the Japan Meteorological Agency is a relative measure of the shaking felt by people and the movement of objects in a specific area.

A seismic intensity of 5-lower is strong enough to cause dishes on shelves or books to fall and unsecured furniture to topple over.

Tremors from the earthquake were also felt in Tokyo.

However, NHK and Kyodo News reported that there is no risk of a tsunami following the earthquake.

According to the Japan Atomic Power Company, no abnormalities were detected at the Tokai No. 2 Nuclear Power Plant in Ibaraki Prefecture, where a seismic intensity of 3 was recorded.

(Photo: Provided by Korea Meteorological Administration, Yonhap News)
※ Please note: This article was translated by AI and may contain errors.