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Location:
15 km ENE of Hebgen Lake Estates, Montana
Period:
23 Nov 2013 03:25:37 - 29 Nov 2013 19:38:03 (6 days 16 hours 12 minutes)
Volcanoes in 100km radius:
None
Earthquakes:
223
91 swarms found nearby.
2000
S20000125.1(10.3km)
25 Jan
1 day 8 hours
67 earthquakes
29 Mar
9 days 3 hours
185 earthquakes
8 Apr
1 day 23 hours
41 earthquakes
S20000526.1(25.2km)
26 May
23 hours
25 earthquakes
S20000728.1(21.3km)
27 Jul
5 days 11 hours
144 earthquakes
25 Oct
2 days 15 hours
52 earthquakes
S20001124.1(21.9km)
23 Nov
3 days 8 hours
120 earthquakes
S20001210.1(25.4km)
9 Dec
1 day 1 hours
29 earthquakes
S20001224.1(17.0km)
23 Dec
4 days 11 hours
64 earthquakes
2001
S20010119.1(15.8km)
18 Jan
4 days 18 hours
341 earthquakes
26 Feb
2 days 5 hours
56 earthquakes
2 Dec
5 days 0 hours
131 earthquakes
8 Dec
19 days 5 hours
335 earthquakes
2002
30 Jan
2 days 22 hours
52 earthquakes
S20021104.1(14.8km)
3 Nov
4 days 4 hours
118 earthquakes
3 Nov
3 days 12 hours
80 earthquakes
5 Dec
2 days 12 hours
405 earthquakes
13 Dec
1 day 12 hours
26 earthquakes
2003
S20030103.2(27.3km)
3 Jan
4 days 3 hours
75 earthquakes
S20030131.1(28.6km)
31 Jan
1 day 15 hours
36 earthquakes
5 Feb
1 day 18 hours
42 earthquakes
2004
13 Apr
6 days 22 hours
457 earthquakes
S20040717.1(10.6km)
16 Jul
1 day 16 hours
38 earthquakes
2005
3 Jun
2 days 8 hours
49 earthquakes
2006
S20060222.1(29.0km)
22 Feb
15 hours
44 earthquakes
S20060613.1(24.2km)
12 Jun
1 day 14 hours
45 earthquakes
18 Jun
1 day 11 hours
57 earthquakes
S20061015.1(28.3km)
14 Oct
19 hours
79 earthquakes
2007
S20070620.1(19.8km)
20 Jun
1 hours
26 earthquakes
14 Dec
22 hours
28 earthquakes
30 Dec
3 days 10 hours
61 earthquakes
2008
9 Jan
4 days 20 hours
89 earthquakes
S20080203.1(19.3km)
3 Feb
21 hours
47 earthquakes
S20080311.1(28.3km)
11 Mar
2 days 13 hours
69 earthquakes
S20080729.1(25.6km)
28 Jul
4 days 18 hours
189 earthquakes
S20080807.1(16.1km)
7 Aug
6 hours
32 earthquakes
S20081203.1(10.2km)
3 Dec
6 days 17 hours
213 earthquakes
2009
16 Apr
5 days 18 hours
136 earthquakes
S20090525.1(27.4km)
25 May
10 hours
70 earthquakes
S20090630.1(20.9km)
30 Jun
1 day 12 hours
34 earthquakes
12 Sep
21 hours
24 earthquakes
16 Sep
1 day 7 hours
28 earthquakes
2010
S20100117.1(24.4km)
16 Jan
19 days 8 hours
2268 earthquakes
2011
3 May
1 day 22 hours
33 earthquakes
2013
S20130507.1(23.5km)
7 May
22 hours
34 earthquakes
29 Jun
3 days 16 hours
79 earthquakes
S20130713.1(11.3km)
13 Jul
19 hours
30 earthquakes
13 Sep
4 days 4 hours
243 earthquakes
27 Sep
1 day 12 hours
28 earthquakes
S20131005.1(29.2km)
5 Oct
7 hours
54 earthquakes
2014
S20140122.1(18.9km)
21 Jan
2 days 1 hours
46 earthquakes
S20140217.1(25.1km)
16 Feb
3 days 7 hours
52 earthquakes
S20140330.1(25.1km)
29 Mar
3 days 19 hours
194 earthquakes
S20140601.1(22.9km)
31 May
6 days 5 hours
232 earthquakes
S20140819.4(12.8km)
18 Aug
1 day 15 hours
42 earthquakes
20 Aug
1 day 4 hours
40 earthquakes
2015
21 Jan
1 day 8 hours
135 earthquakes
13 Oct
1 day 20 hours
31 earthquakes
7 Nov
1 day 23 hours
85 earthquakes
2016
24 Sep
1 day 16 hours
46 earthquakes
2017
12 Jun
45 days 12 hours
1542 earthquakes
1 Aug
17 days 7 hours
784 earthquakes
S20170821.1(11.2km)
20 Aug
4 days 18 hours
43 earthquakes
27 Aug
3 days 8 hours
66 earthquakes
2018
15 Feb
11 days 1 hours
728 earthquakes
S20180725.1(21.0km)
24 Jul
2 days 20 hours
52 earthquakes
2019
S20190326.2(19.8km)
26 Mar
20 hours
29 earthquakes
S20191026.1(19.7km)
26 Oct
1 day 22 hours
83 earthquakes
2020
S20200219.1(21.0km)
18 Feb
2 days 20 hours
62 earthquakes
9 May
2 days 5 hours
80 earthquakes
S20200522.1(19.9km)
22 May
2 hours
36 earthquakes
S20200529.1(20.5km)
29 May
1 day 10 hours
88 earthquakes
2021
21 Jun
1 day 13 hours
117 earthquakes
27 Jun
5 days 17 hours
230 earthquakes
16 Sep
4 days 0 hours
75 earthquakes
30 Sep
1 day 16 hours
62 earthquakes
2022
S20220329.1(11.0km)
28 Mar
2 days 12 hours
117 earthquakes
S20220611.1(19.9km)
10 Jun
2 days 20 hours
62 earthquakes
S20220826.1(19.0km)
26 Aug
9 days 4 hours
198 earthquakes
S20220918.2(18.8km)
17 Sep
6 days 20 hours
389 earthquakes
S20220930.1(20.0km)
29 Sep
3 days 4 hours
53 earthquakes
S20221013.1(19.2km)
13 Oct
8 days 6 hours
111 earthquakes
S20221115.1(20.2km)
14 Nov
2 days 5 hours
48 earthquakes
2023
6 Feb
2 days 9 hours
63 earthquakes
13 Mar
1 day 18 hours
136 earthquakes
S20231004.1(20.7km)
3 Oct
1 day 14 hours
39 earthquakes
2024
S20240106.1(10.2km)
6 Jan
10 hours
35 earthquakes
S20240218.1(21.0km)
18 Feb
9 hours
50 earthquakes
23 Apr
4 days 7 hours
79 earthquakes
2025
4 Mar
12 hours
25 earthquakes
7 May
8 hours
37 earthquakes
AI-generated article — for informational and entertainment purposes only. May contain inaccuracies. Full disclaimerFound an error?

Seismic Swarm S20131123.1 Near Hebgen Lake, Montana

The seismic swarm designated S20131123.1 was recorded in the Hebgen Lake region of Montana, centered 15 km east-northeast of Hebgen Lake Estates. Activity began at 03:25 on 23 November 2013 and concluded at 19:38 on 29 November 2013, spanning 160 hours and 12 minutes. During this interval, 223 earthquakes were detected. Analysis of the initial 100 events reveals predominantly low-magnitude seismicity. Recorded magnitudes ranged from negative values to a peak of 3.3, with the majority falling between 0.0 and 2.0. Focal depths clustered tightly around 8–10 km, indicating a consistent shallow crustal source. Temporal distribution showed elevated rates during the evening of 23 November, including several events exceeding magnitude 2.0 within a short window. Subsequent hours displayed intermittent bursts separated by quieter periods, consistent with swarm behavior rather than a classic mainshock-aftershock sequence. This swarm fits into a broader pattern of seismic activity in the area. Since 1 January 2000, 50 swarms have been documented in the region. Annual counts include 9 swarms in 2000, 4 in 2001, 5 in 2002, 3 in 2003, 2 in 2004, 1 in 2005, 4 in 2006, 3 in 2007, 6 in 2008, 5 in 2009, 1 in 2010, 1 in 2011, and 6 in 2013. Such recurrent swarms reflect ongoing tectonic processes along the Intermountain Seismic Belt. Geologically, the Hebgen Lake area lies within a zone of active extension influenced by the Yellowstone hotspot. The region features normal faulting and is situated near the boundary of the Yellowstone Caldera system. Historical precedent includes the magnitude 7.3 Hebgen Lake earthquake of 1959, which produced significant surface rupture and demonstrated the potential for larger events in this tectonically dynamic setting. Depths of 8–11 km align with typical crustal seismicity in the northern Rocky Mountains. SeismoSight internal classification provided the swarm parameters and event catalog. Geological context draws from established records of the Intermountain Seismic Belt and Yellowstone volcanic system.