Moderate earthquakes may cause minor damage
Earthquakes are classified by depth: shallow (0-70 km), intermediate (70-300 km), and deep (300-700 km). This event occurred at a shallow depth of 19.8 kilometers.
| Coordinates | 51.1736°N, 178.0079°W |
| Depth | 19.8 km |
| Magnitude Type | ml |
| USGS Status | Reviewed by a seismologist |
| Reports from the Public | 1 reports |
| Tsunami Risk | Potential tsunami risk; refer to NOAA for updates |
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Epicenter location of the Magnitude 5.6 earthquake, 123 km SW of Adak, Alaska
A magnitude 5.6 earthquake occurred near 123 km SW of Adak, Alaska on September 21, 2025 at 09:30 AM UTC. This shallow earthquake originated at a depth of 19.8 kilometers below the Earth's surface. 1 person reported feeling this earthquake to the USGS. The earthquake was detected by several seismic monitoring stations operated by the USGS. The ml magnitude measurement indicates this was a local magnitude event, which is appropriate for earthquakes of this size and depth. Earthquakes of magnitude 4.5 to 5.9 are classified as moderate earthquakes by the USGS. This event contributes to our understanding of seismic activity in the region.
1 person reported feeling this earthquake, with felt intensities reaching weak shaking (III) and estimated shaking up to barely felt (II).
Did you feel the shaking? Your story matters—share it with the USGS to help map this quake's impact!
During an earthquake, remember to Drop, Cover, and Hold On. Stay indoors and take cover under a sturdy table or desk, protecting your head and neck. If you're outside, move to an open area away from buildings, trees, and power lines. After the shaking stops, check for injuries and damage, and be prepared for aftershocks. Residents in the affected area should be aware of potential secondary hazards that are common in your region. Prepare an emergency kit with essential supplies including water, non-perishable food, first aid supplies, flashlight, and batteries. Stay informed by following updates from local authorities and emergency services. Consider submitting a felt report to help seismologists better understand this event's impact.