4.1

M4.1 Earthquake 236 km ESE of Attu Station, AlaskaApril 17, 2026

2026-04-17 21:12:54 UTC (1 day ago)

On April 17, 2026 at 21:12 UTC, a magnitude 4.1 shallow crustal earthquake struck 236 km ESE of Attu Station, Alaska, at a depth of 10.0 km and coordinates 51.9022°, 176.3053°.

Map showing earthquake epicenter at 51.90°, 176.31°

Earthquake Details

Magnitude
4.1 mb
Depth
10.0 km
shallow crustal
Location
51.9022°N
176.3053°E
Intensity (MMI)
2.0
weak

Technical Information

Event ID
us6000sr0y
Event Type
earthquake
Status
✓ Reviewed
Significance
259
Stations Used
24
Azimuthal Gap
197.0°
Min Station Distance
1.367°
RMS Residual
1.18 sec
Last Updated
2026-04-18 03:04:02 UTC

Common Questions

How strong was the magnitude 4.1 earthquake near Attu Station, Alaska?

The magnitude 4.1 earthquake that struck 236 km ESE of Attu Station, Alaska on April 17, 2026 at 21:12 UTC had a depth of 10.0 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 4.1 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.