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3 Oct 2025, 03:19 UTC · Oct 2, 11:19 PM ET

M3.8 earthquake 22 km NNW of Spencer, Idaho

A magnitude 3.8 earthquake struck 22 km NNW of Spencer, Idaho at Oct 2, 11:19 PM ET, 10 km deep, minor – felt by people near the epicenter.

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M2.6 10 km W of Hebgen Lake Estates, MontanaM2.6 24 km N of Spencer, IdahoM2.6 26 km N of Spencer, IdahoM2.7 48 km NE of Spencer, IdahoM2.7 23 km N of Spencer, IdahoM2.8 3 km ESE of Hebgen Lake Estates, MontanaM2.8 19 km NE of Lima, MontanaM2.9 30 km W of Hebgen Lake Estates, MontanaM2.9 23 km N of Spencer, IdahoM3.0 27 km N of Spencer, IdahoM3.2 18 km N of Leadore, IdahoM3.3 18 km S of Lima, MontanaM3.8 22 km NNW of Spencer, Idaho
under 33–44–55–66+
Magnitude3.8 mwr
Time3 Oct 2025, 03:19 UTC
Location44.563°, -112.244° – 22 km NNW of Spencer, Idaho
Depth10.0 km
Felt reports0
Max. estimated intensity (MMI)3.8
USGS eventus6000reed
Within 100 km

Other earthquakes nearby this year

Mag.WhereWhen (ET)DepthFelt
3.318 km S of Lima, MontanaJun 30, 8:35 PM
108 d ago		8 km–
3.218 km N of Leadore, IdahoMay 25, 3:38 PM
144 d ago		6 km–
3.027 km N of Spencer, IdahoSep 28, 12:21 PM
383 d ago		10 km–
2.930 km W of Hebgen Lake Estates, MontanaApr 4, 10:26 PM
195 d ago		10 km2 reports
2.923 km N of Spencer, IdahoOct 5, 5:25 AM
376 d ago		8 km1 report
2.819 km NE of Lima, MontanaMay 8, 4:16 AM
162 d ago		11 km–
2.83 km ESE of Hebgen Lake Estates, MontanaSep 8, 3:21 AM
39 d ago		11 km–
2.748 km NE of Spencer, IdahoJul 1, 7:44 PM
107 d ago		10 km–
2.723 km N of Spencer, IdahoOct 4, 4:48 AM
378 d ago		10 km–
2.624 km N of Spencer, IdahoNov 4, 11:38 PM
346 d ago		10 km–
2.626 km N of Spencer, IdahoOct 4, 7:54 AM
377 d ago		14 km–
2.610 km W of Hebgen Lake Estates, MontanaJan 10, 1:06 PM
279 d ago		12 km–
FAQ

About this earthquake

How strong was the 22 km NNW of Spencer, Idaho earthquake?

Magnitude 3.8 (mwr), minor – felt by people near the epicenter. Depth 10 km. Strongest estimated shaking: intensity 3.8 on the Modified Mercalli scale.

Was it felt?

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

Were there aftershocks?

3 earthquakes within 100 km in the following two weeks are in our records, the strongest M2.9.

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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M3.8 earthquake 22 km NNW of Spencer, Idaho — 77.today