A strong tremor jolted Nagano Prefecture late Friday evening. The shaking occurred at around 8:19 p.m. local time.
The Japan Meteorological Agency reported an earthquake alert following the event. Data indicates the quake registered an estimated magnitude of 5.0.
Its focus was shallow, located at a depth of approximately 10 kilometers. The epicenter coordinates were given as N 36.5 and E 137.9 in northern Nagano.
Intensity reached lower 5 on Japan's seven-point shindo seismic scale in specific locations. Cities and villages such as Omachi, Ogawa, and Chikuhoku experienced this level of shaking.
Officials confirmed no tsunami warning was issued immediately after the quake. There is no danger from sea level changes.
An earthquake early warning was automatically issued before the strongest shaking arrived. This system provides crucial seconds of notice.
In response to the seismic activity, the central government established a liaison office. This office operates under the crisis management center at the prime minister's residence.
The estimated magnitude 5 earthquake underscores the region's seismic vulnerability. Residents are reminded to stay prepared for future events.