4.4

M4.4 Earthquake 129 km E of Yamada, JapanApril 20, 2026

2026-04-20 16:13:17 UTC (5 hours ago)

On April 20, 2026 at 16:13 UTC, a magnitude 4.4 shallow crustal earthquake struck 129 km E of Yamada, Japan, at a depth of 37.5 km and coordinates 39.4793°, 143.4588°.

Map showing earthquake epicenter at 39.48°, 143.46°

Earthquake Details

Magnitude
4.4 mb
Depth
37.5 km
shallow crustal
Location
39.4793°N
143.4588°E

Technical Information

Event ID
us6000srkt
Event Type
earthquake
Status
✓ Reviewed
Significance
298
Stations Used
72
Azimuthal Gap
135.0°
Min Station Distance
2.254°
RMS Residual
0.53 sec
Last Updated
2026-04-20 17:07:59 UTC

Common Questions

How strong was the magnitude 4.4 earthquake near Yamada, Japan?

The magnitude 4.4 earthquake that struck 129 km E of Yamada, Japan on April 20, 2026 at 16:13 UTC had a depth of 37.5 km. For context, this was a light earthquake commonly felt near the epicenter.

Were there aftershocks?

Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.4 earthquakes can continue for several days and gradually diminish over time.

What should I do after an earthquake?

If you were in the affected area: check yourself and others for injuries, inspect your home for damage, and be prepared for aftershocks. For detailed guidance, see our earthquake safety guide and emergency planning resources.