M 5.5 - 67 km SSW of Adak, Alaska
November 23, 2025 at 08:21:44 UTC
Depth: 33.00 km (Shallow)
Key Takeaway
This moderate earthquake (M5.5) occurred 3 months ago near 67 km SSW of Adak, Alaska, at a depth of 33.00 km (shallow). It was felt by 3 people.
Moderate
PAGER Alert
Tsunami
Felt Reports
Event Details
| Magnitude | 5.5 mww |
| Depth | 33.00 km (Shallow) |
| Location | 51.3114N, 177.0161W |
| Community Intensity | III (Weak) |
| Mercalli Intensity | IV (Light) |
| Felt Reports (DYFI) | 3 people |
| Alert Level (PAGER) | Green — No fatalities or damage expected |
| Tsunami Warning | No |
| Significance | 467 / 3000 |
| Status | Reviewed |
| Network | us |
| USGS Event Page | View on USGS → |
Frequently Asked Questions
What was the magnitude of this earthquake?
This earthquake had a magnitude of 5.5, classified as "Moderate". Moderate earthquakes can cause damage to poorly constructed buildings.
How deep was this earthquake?
This earthquake occurred at a depth of 33.00 km, classified as "Shallow". Shallow earthquakes tend to cause more damage at the surface because the energy has less distance to travel before reaching buildings and infrastructure.
Where exactly did this earthquake occur?
This earthquake occurred near 67 km SSW of Adak, Alaska, at coordinates 51.3114N, 177.0161W. The location is determined by analyzing seismic wave arrival times at multiple monitoring stations.
Were there aftershocks associated with this event?
Aftershock data for this specific event can be explored by viewing nearby recent earthquakes listed below on this page. Aftershocks are smaller earthquakes that occur in the same area following a larger event, and they can continue for days, weeks, or even months depending on the original earthquake's magnitude.
What does the magnitude of this earthquake mean in practical terms?
A magnitude 5.5 earthquake is classified as "Moderate" — these are widely felt and can cause damage to vulnerable structures, though well-built buildings typically withstand them.
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Data from the USGS Earthquake Hazards Program (ComCat). QuakeScan is not affiliated with the USGS. Event details may be updated as new data becomes available.