Japan Faces Consecutive Quakes: Meteorological Agency Warns of Intense Shaking
On April 18, 2026, northern Nagano Prefecture was hit by a series of earthquakes. The largest shocks were felt in Omachi and Nagano cities.
Seismic sequence and observations
The first quake struck around 13:20 Japan Standard Time. The Japan Meteorological Agency estimated its magnitude at 5.0.
Omachi City recorded the highest intensity of 5-strong. Surrounding areas reported shaking of intensity 1 to 3.
After detailed analysis, the agency revised the first quake’s depth from 10 kilometers to 8 kilometers.
| Time (JST) | Estimated Magnitude | Depth (approx.) | Maximum Intensity (JMA) |
|---|---|---|---|
| 13:20 | 5.0 | 8 km (revised) | 5-strong (Omachi) |
| 14:54 | 5.1 | ~10 km | 5-weak (Nagano, Omachi) |
| 17:47 | 3.0 | ~10 km | 3 (Omachi) |
About one hour and a half after the first shock, a second quake occurred. It had an estimated magnitude of 5.1 and depth near 10 kilometers.
A third, smaller quake arrived around 17:47. Its magnitude was about 3.0 and depth near 10 kilometers.
No tsunami threat was reported following these events.
Warnings and risks
With consecutive quakes striking the area, the Meteorological Agency warned residents to expect intense shaking. The agency held a press briefing.
Officials asked people to remain alert for roughly one week. They emphasized the next two to three days require particular caution.
JMA noted active fault zones near the epicenter. The region has a history of repeated strong shaking.
Authorities said they cannot rule out the possibility of a larger event. A major quake could produce shaking of seismic intensity 6-strong or higher.
Heavily shaken areas face heightened risks. Falling rocks and landslides are more likely, especially during or after rain.
Practical advice for residents
- Monitor official updates from local authorities and JMA.
- Secure furniture and loose objects in homes.
- Avoid steep slopes and unstable ground after rainfall.
- Have evacuation routes and emergency kits ready.
Report compiled by Filmogaz.com based on Japan Meteorological Agency observations and local broadcaster reports.
