29 Oct 2025, 19:12 UTC · Oct 29, 3:12 PM ET

M3.6 earthquake 23 km NW of Old Harbor, Alaska

A magnitude 3.6 earthquake struck 23 km NW of Old Harbor, Alaska at Oct 29, 3:12 PM ET, 29 km deep, minor – felt by people near the epicenter.

M3.2 39 km SSW of Karluk, AlaskaM3.3 35 km NW of Karluk, AlaskaM3.4 56 km W of Akhiok, AlaskaM3.4 51 km SSE of Old Harbor, AlaskaM3.5 13 km WNW of Larsen Bay, AlaskaM3.6 23 km NW of Old Harbor, AlaskaM3.7 37 km SW of Karluk, AlaskaM3.7 32 km SSW of Karluk, AlaskaM3.8 34 km W of Aleneva, AlaskaM4.0 18 km N of Larsen Bay, AlaskaM4.2 24 km SSW of Chiniak, AlaskaM4.2 10 km N of Old Harbor, AlaskaM4.5 41 km SW of Karluk, Alaska
under 33–44–55–66+
Magnitude3.6 ml
Time29 Oct 2025, 19:12 UTC
Location57.325°, -153.628° – 23 km NW of Old Harbor, Alaska
Depth28.9 km
Felt reports0
Max. estimated intensity (MMI)2.0
USGS eventak025dvromz5
Within 100 km

Other earthquakes nearby this year

Mag.WhereWhen (ET)DepthFelt
4.541 km SW of Karluk, AlaskaAug 17, 4:35 PM
60 d ago
58 km6 reports
4.224 km SSW of Chiniak, AlaskaApr 28, 10:36 PM
171 d ago
48 km18 reports
4.210 km N of Old Harbor, AlaskaApr 23, 3:12 AM
177 d ago
41 km38 reports
4.018 km N of Larsen Bay, AlaskaMar 24, 1:36 AM
207 d ago
29 km3 reports
3.834 km W of Aleneva, AlaskaAug 23, 3:42 AM
55 d ago
65 km4 reports
3.737 km SW of Karluk, AlaskaSep 22, 4:48 AM
25 d ago
51 km1 report
3.732 km SSW of Karluk, AlaskaApr 8, 9:16 PM
191 d ago
20 km–
3.513 km WNW of Larsen Bay, AlaskaMar 13, 7:00 AM
217 d ago
47 km1 report
3.456 km W of Akhiok, AlaskaOct 4, 9:38 AM
12 d ago
65 km–
3.451 km SSE of Old Harbor, AlaskaMar 13, 8:03 PM
217 d ago
22 km–
3.335 km NW of Karluk, AlaskaNov 9, 9:29 AM
341 d ago
61 km–
3.239 km SSW of Karluk, AlaskaAug 11, 10:28 AM
66 d ago
44 km–
FAQ

About this earthquake

How strong was the 23 km NW of Old Harbor, Alaska earthquake?

Magnitude 3.6 (ml), minor – felt by people near the epicenter. Depth 29 km. Strongest estimated shaking: intensity 2.0 on the Modified Mercalli scale.

Was it felt?

No felt reports have been submitted to the USGS so far.

Were there aftershocks?

1 earthquakes within 100 km in the following two weeks are in our records, the strongest M3.3.

Earthquakes

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.

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M3.6 earthquake 23 km NW of Old Harbor, Alaska — 77.today