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Location:
51 km SE of West Yellowstone, Montana
Period:
3 Nov 2002 22:46:51 - 5 Nov 2002 01:40:42 (1 day 2 hours 53 minutes)
Volcanoes in 100km radius:
None
Earthquakes:
25
59 swarms found nearby.
2000
9 Mar
9 hours
28 earthquakes
2001
3 Feb
15 hours
26 earthquakes
2002
15 Jan
7 hours
67 earthquakes
8 Oct
3 days 11 hours
120 earthquakes
3 Nov
2 days 6 hours
67 earthquakes
10 Nov
15 hours
30 earthquakes
5 Dec
1 day 6 hours
39 earthquakes
2004
31 Aug
1 day 10 hours
27 earthquakes
2006
S20060222.1(26.9km)
22 Feb
15 hours
44 earthquakes
18 Mar
12 hours
28 earthquakes
5 Apr
16 hours
77 earthquakes
S20060613.1(27.5km)
12 Jun
1 day 14 hours
45 earthquakes
10 Jul
5 hours
35 earthquakes
S20061015.1(25.9km)
14 Oct
19 hours
79 earthquakes
2008
S20080126.1(19.4km)
25 Jan
12 hours
33 earthquakes
S20080311.1(23.9km)
11 Mar
2 days 13 hours
69 earthquakes
S20080729.1(27.4km)
28 Jul
4 days 18 hours
189 earthquakes
27 Dec
8 days 7 hours
823 earthquakes
2009
S20090525.1(23.1km)
25 May
10 hours
70 earthquakes
14 Sep
2 days 16 hours
39 earthquakes
17 Sep
19 hours
25 earthquakes
14 Oct
3 days 23 hours
138 earthquakes
2010
S20100117.1(30.0km)
16 Jan
19 days 8 hours
2268 earthquakes
12 Jun
22 hours
28 earthquakes
2011
14 Apr
7 hours
24 earthquakes
2013
6 Jan
1 day 14 hours
54 earthquakes
15 Apr
17 hours
30 earthquakes
23 Jun
5 hours
29 earthquakes
13 Sep
4 days 4 hours
243 earthquakes
S20131005.1(21.8km)
5 Oct
7 hours
54 earthquakes
2014
6 Jul
12 hours
46 earthquakes
2015
4 Sep
4 hours
24 earthquakes
2016
24 Nov
1 day 13 hours
60 earthquakes
2017
14 Aug
22 hours
32 earthquakes
2018
11 Mar
7 hours
28 earthquakes
11 Apr
1 day 0 hours
114 earthquakes
31 Dec
4 hours
57 earthquakes
2019
22 Jul
3 days 7 hours
61 earthquakes
29 Aug
14 hours
43 earthquakes
2020
12 Feb
11 hours
36 earthquakes
10 Sep
2 days 23 hours
117 earthquakes
1 Dec
2 days 8 hours
114 earthquakes
6 Dec
1 day 7 hours
37 earthquakes
24 Dec
12 hours
47 earthquakes
2021
21 Jun
1 day 13 hours
117 earthquakes
15 Jul
7 days 4 hours
820 earthquakes
16 Sep
4 days 0 hours
75 earthquakes
27 Sep
7 hours
26 earthquakes
30 Sep
1 day 16 hours
62 earthquakes
25 Nov
2 days 12 hours
61 earthquakes
2022
12 Feb
7 hours
25 earthquakes
2 Mar
1 day 22 hours
33 earthquakes
5 Sep
3 hours
40 earthquakes
5 Oct
1 day 8 hours
32 earthquakes
2023
29 Mar
2 days 6 hours
110 earthquakes
16 Apr
1 day 20 hours
38 earthquakes
24 Apr
6 hours
31 earthquakes
2024
1 Jan
1 day 16 hours
47 earthquakes
3 Jan
1 day 15 hours
62 earthquakes
AI-generated article — for informational and entertainment purposes only. May contain inaccuracies. Full disclaimerFound an error?

Seismic Swarm SVS20021104.2 Near West Yellowstone, Montana

Seismic swarm SVS20021104.2 occurred in the Yellowstone region, with activity registered 51 km southeast of West Yellowstone, Montana. The sequence began at 22:46 on 3 November 2002 and concluded at 01:40 on 5 November 2002, spanning 26 hours and 53 minutes during which 25 earthquakes were recorded.

Event magnitudes ranged from 0.6 to 2.6. The largest event measured 2.6 and occurred at 00:47:47 on 4 November at a depth of 11 km. Other notable events included a magnitude 2.3 quake at 23:51:06 on 3 November (depth 2 km) and a magnitude 2.1 event at 23:21:05 on 3 November (depth 4 km). The majority of events were shallow, with focal depths between 1 km and 12 km; one outlier reached 31 km on 4 November at 09:51:28.

This swarm forms part of the broader seismic environment of the Yellowstone volcanic plateau. The region lies within an active caldera system where tectonic extension along the Intermountain Seismic Belt interacts with hydrothermal fluid circulation and minor magmatic movements. These processes routinely generate earthquake swarms characterized by numerous small-magnitude events clustered in time and space.

Historical records from the SeismoSight classification indicate five swarms in the area since 1 January 2000. Prior swarms occurred in 2000 (one swarm), 2001 (one swarm), and 2002 (three swarms, including SVS20021104.2). Such sequences are consistent with the long-term behavior of the Yellowstone system, where swarms typically last from hours to days and rarely exceed magnitude 3.0.

No significant surface deformation or volcanic unrest was associated with this particular swarm. Monitoring by regional seismic networks continues to track activity in the area to distinguish between routine hydrothermal seismicity and any deeper magmatic signals.

References
SeismoSight internal swarm classification records
USGS Earthquake Hazards Program – Yellowstone region monitoring data
USGS Volcano Hazards Program – Geology and history of the Yellowstone Plateau