Earthquake · Reviewed by USGS

M3.4 earthquake 17 km S of Boulder, Montana

A magnitude 3.4 earthquake struck 17 km S of Boulder, Montana at Oct 29, 2021, 09:19 UTC, at a depth of 10 km. The epicentre was 35 km (21 mi) ENE of Butte. 9 people reported feeling it to USGS.

Details

Magnitude	3.4 ml
Time	Oct 29, 2021, 09:19 UTC
Depth	10.0 km
Coordinates	46.084, -112.103
Felt reports	9
Tsunami flag	None
Source	USGS event page

Fig. 1The epicentre and other earthquakes within 100 km, since the day before

01 — Nearby

Nearest cities

02 — Around it

Other earthquakes within 100 km

Other earthquakes within 100 km since the day before this event
Magnitude	Location	Distance	Depth	Time
2.4	20 km SW of Whitehall, Montana	40 km / 25 mi	depth 2 km	Oct 25, 09:27 UTC
1.2	18 km E of Townsend, Montana	68 km / 42 mi	depth 13 km	Oct 22, 11:13 UTC
1.1	6 km SSW of Toston, Montana	49 km / 30 mi	depth 2 km	Oct 22, 09:13 UTC
2.3	6 km SSW of Toston, Montana	49 km / 31 mi	depth 1 km	Oct 22, 09:11 UTC
1.7	7 km S of Toston, Montana	50 km / 31 mi	depth 5 km	Oct 22, 08:59 UTC
1.4	5 km WSW of Elliston, Montana	59 km / 37 mi	depth 16 km	Oct 17, 23:36 UTC
2.1	6 km WSW of Elliston, Montana	60 km / 37 mi	depth 14 km	Oct 17, 00:44 UTC
1.5	6 km E of Butte, Montana	28 km / 18 mi	depth -2 km	Oct 16, 19:01 UTC
2.1	15 km ENE of Twin Bridges, Montana	53 km / 33 mi	depth 4 km	Oct 16, 15:31 UTC
1.6	15 km S of Whitehall, Montana	39 km / 24 mi	depth 4 km	Oct 16, 12:52 UTC
1.7	8 km W of Townsend, Montana	44 km / 28 mi	depth -2 km	Oct 15, 20:32 UTC
1.8	5 km E of Butte, Montana	29 km / 18 mi	depth -2 km	Oct 15, 19:15 UTC
1.6	2 km SE of South Hills, Montana	52 km / 32 mi	depth -2 km	Oct 14, 17:34 UTC
1.2	5 km SSE of Bozeman, Montana	99 km / 61 mi	depth 4 km	Oct 14, 10:03 UTC
1.9	19 km NNE of Dillon, Montana	86 km / 53 mi	depth 9 km	Oct 13, 17:42 UTC
2.0	15 km NNE of Dillon, Montana	90 km / 56 mi	depth 11 km	Oct 12, 01:23 UTC
1.5	8 km W of Townsend, Montana	44 km / 27 mi	depth -2 km	Oct 8, 20:06 UTC
1.4	6 km E of Butte, Montana	28 km / 17 mi	depth -2 km	Oct 8, 18:54 UTC
1.3	14 km ESE of Lincoln, Montana	95 km / 59 mi	depth 9 km	Oct 5, 08:37 UTC
1.2	14 km ESE of Lincoln, Montana	95 km / 59 mi	depth 9 km	Oct 5, 07:56 UTC
1.4	9 km N of Radersburg, Montana	42 km / 26 mi	depth -2 km	Oct 1, 20:20 UTC
1.7	5 km E of Butte, Montana	29 km / 18 mi	depth -2 km	Oct 1, 19:01 UTC
1.6	11 km ESE of Lincoln, Montana	98 km / 61 mi	depth 12 km	Sep 28, 02:54 UTC
1.6	13 km ENE of Elliston, Montana	62 km / 38 mi	depth 7 km	Sep 26, 19:27 UTC
2.9	14 km NNE of Twin Bridges, Montana	48 km / 30 mi	depth 5 km	Jun 6, 22:22 UTC

USGS can revise magnitude and location after the first report. See magnitude vs intensity and aftershocks.