M5.5 earthquake 122 km SW of Adak, Alaska
A magnitude 5.5 earthquake struck 122 km SW of Adak, Alaska at Sep 21, 5:30 AM ET, 30 km deep, moderate – felt widely, some damage to weak buildings. 4 people reported feeling it.
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| Magnitude | 5.5 mww |
| Time | 21 Sept 2025, 09:30 UTC |
| Location | 51.199°, -178.022° – 122 km SW of Adak, Alaska |
| Depth | 30.0 km |
| Felt reports | 4 |
| Max. estimated intensity (MMI) | 4.8 |
| PAGER alert | green |
| USGS event | us7000qxp1 |
Other earthquakes nearby this year
| Mag. | Where | When (ET) | Depth | Felt |
|---|---|---|---|---|
| 5.5 | 67 km SSW of Adak, Alaska · PAGER green | Nov 23, 3:21 AM 328 d ago | 33 km | 3 reports |
| 5.1 | 149 km WSW of Adak, Alaska · tsunami flag | Sep 11, 6:47 AM 35 d ago | 37 km | – |
| 4.9 | 71 km SSW of Adak, Alaska | Oct 20, 2:45 PM 361 d ago | 37 km | 2 reports |
| 4.6 | 181 km WSW of Adak, Alaska | Apr 5, 5:19 AM 194 d ago | 35 km | – |
| 4.6 | 137 km SW of Adak, Alaska | Feb 17, 6:12 PM 241 d ago | 10 km | – |
| 4.5 | 142 km WSW of Adak, Alaska | Jan 19, 7:32 PM 270 d ago | 35 km | – |
| 4.4 | 140 km WSW of Adak, Alaska | Nov 27, 11:32 PM 323 d ago | 48 km | – |
| 4.3 | 122 km SW of Adak, Alaska | Jul 11, 2:41 AM 98 d ago | 35 km | – |
| 4.3 | 124 km SW of Adak, Alaska | Nov 21, 1:49 PM 329 d ago | 46 km | – |
| 4.2 | 141 km WSW of Adak, Alaska | Feb 23, 2:14 PM 235 d ago | 35 km | – |
| 4.2 | 199 km WSW of Adak, Alaska | Dec 3, 6:39 AM 317 d ago | 13 km | – |
| 4.1 | 152 km SW of Adak, Alaska | Sep 11, 6:52 AM 35 d ago | 28 km | – |
About this earthquake
How strong was the 122 km SW of Adak, Alaska earthquake?
Magnitude 5.5 (mww), moderate – felt widely, some damage to weak buildings. Depth 30 km. Strongest estimated shaking: intensity 4.8 on the Modified Mercalli scale.
Was it felt?
4 people reported feeling it to the USGS "Did You Feel It?" survey; the highest reported intensity was 3.7.
Were there aftershocks?
No earthquakes within 100 km have followed so far in our records.
More
Source: U.S. Geological Survey (USGS) earthquake catalog, real-time feeds and FDSN event service; magnitudes and locations are revised by seismologists for hours after an event. Times are Eastern (ET) unless marked UTC. Not an alert service: for warnings follow local authorities and tsunami centers.