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Location:
25 km ENE of West Yellowstone, Montana
Period:
26 Mar 2019 00:44:58 - 26 Mar 2019 21:08:27 (20 hours 23 minutes)
Volcanoes in 100km radius:
None
Earthquakes:
29
107 swarms found nearby.
2000
S20000125.1(16.8km)
25 Jan
1 day 8 hours
67 earthquakes
9 Mar
9 hours
28 earthquakes
S20000329.2(16.7km)
29 Mar
9 days 3 hours
185 earthquakes
S20000409.1(17.1km)
8 Apr
1 day 23 hours
41 earthquakes
26 May
23 hours
25 earthquakes
27 Jul
5 days 11 hours
144 earthquakes
S20001025.1(25.8km)
25 Oct
2 days 15 hours
52 earthquakes
23 Nov
3 days 8 hours
120 earthquakes
9 Dec
1 day 1 hours
29 earthquakes
23 Dec
4 days 11 hours
64 earthquakes
2001
S20010119.1(22.5km)
18 Jan
4 days 18 hours
341 earthquakes
3 Feb
15 hours
26 earthquakes
S20010227.1(15.6km)
26 Feb
2 days 5 hours
56 earthquakes
S20011202.1(20.6km)
2 Dec
5 days 0 hours
131 earthquakes
S20011209.3(20.5km)
8 Dec
19 days 5 hours
335 earthquakes
2002
15 Jan
7 hours
67 earthquakes
S20020130.2(14.5km)
30 Jan
2 days 22 hours
52 earthquakes
S20021104.1(16.7km)
3 Nov
4 days 4 hours
118 earthquakes
S20021104.5(20.2km)
3 Nov
3 days 12 hours
80 earthquakes
S20021205.1(14.1km)
5 Dec
2 days 12 hours
405 earthquakes
S20021214.1(15.5km)
13 Dec
1 day 12 hours
26 earthquakes
2003
S20030103.2(26.9km)
3 Jan
4 days 3 hours
75 earthquakes
S20030131.1(28.4km)
31 Jan
1 day 15 hours
36 earthquakes
S20030206.1(18.2km)
5 Feb
1 day 18 hours
42 earthquakes
2004
S20040413.1(10.7km)
13 Apr
6 days 22 hours
457 earthquakes
S20040717.1(29.9km)
16 Jul
1 day 16 hours
38 earthquakes
2005
S20050604.1(25.7km)
3 Jun
2 days 8 hours
49 earthquakes
2006
S20060222.1(25.1km)
22 Feb
15 hours
44 earthquakes
S20060613.1(18.1km)
12 Jun
1 day 14 hours
45 earthquakes
S20060618.1(17.7km)
18 Jun
1 day 11 hours
57 earthquakes
10 Jul
5 hours
35 earthquakes
S20061015.1(23.2km)
14 Oct
19 hours
79 earthquakes
2007
20 Jun
1 hours
26 earthquakes
S20071214.1(25.4km)
14 Dec
22 hours
28 earthquakes
S20071231.1(10.9km)
30 Dec
3 days 10 hours
61 earthquakes
2008
S20080109.1(11.8km)
9 Jan
4 days 20 hours
89 earthquakes
S20080126.1(21.2km)
25 Jan
12 hours
33 earthquakes
3 Feb
21 hours
47 earthquakes
S20080311.1(20.9km)
11 Mar
2 days 13 hours
69 earthquakes
S20080729.1(20.7km)
28 Jul
4 days 18 hours
189 earthquakes
7 Aug
6 hours
32 earthquakes
S20081203.1(27.2km)
3 Dec
6 days 17 hours
213 earthquakes
2009
S20090417.1(27.0km)
16 Apr
5 days 18 hours
136 earthquakes
S20090525.1(15.2km)
25 May
10 hours
70 earthquakes
30 Jun
1 day 12 hours
34 earthquakes
S20090913.1(23.9km)
12 Sep
21 hours
24 earthquakes
S20090916.1(27.6km)
16 Sep
1 day 7 hours
28 earthquakes
2010
S20100117.1(21.9km)
16 Jan
19 days 8 hours
2268 earthquakes
2011
S20110504.1(21.3km)
3 May
1 day 22 hours
33 earthquakes
2013
S20130507.1(21.4km)
7 May
22 hours
34 earthquakes
S20130630.1(22.8km)
29 Jun
3 days 16 hours
79 earthquakes
13 Jul
19 hours
30 earthquakes
13 Sep
4 days 4 hours
243 earthquakes
S20130928.1(27.8km)
27 Sep
1 day 12 hours
28 earthquakes
S20131005.1(19.1km)
5 Oct
7 hours
54 earthquakes
S20131123.1(19.8km)
23 Nov
6 days 16 hours
223 earthquakes
2014
21 Jan
2 days 1 hours
46 earthquakes
S20140211.1(20.6km)
11 Feb
3 days 20 hours
69 earthquakes
16 Feb
3 days 7 hours
52 earthquakes
29 Mar
3 days 19 hours
194 earthquakes
31 May
6 days 5 hours
232 earthquakes
6 Jul
12 hours
46 earthquakes
S20140821.1(25.0km)
20 Aug
1 day 4 hours
40 earthquakes
2015
S20150121.1(23.7km)
21 Jan
1 day 8 hours
135 earthquakes
S20151014.1(28.0km)
13 Oct
1 day 20 hours
31 earthquakes
S20151107.1(23.6km)
7 Nov
1 day 23 hours
85 earthquakes
2016
S20160925.1(26.3km)
24 Sep
1 day 16 hours
46 earthquakes
2017
S20170612.3(20.3km)
12 Jun
45 days 12 hours
1542 earthquakes
S20170802.1(21.9km)
1 Aug
17 days 7 hours
784 earthquakes
14 Aug
22 hours
32 earthquakes
S20170827.1(17.9km)
27 Aug
3 days 8 hours
66 earthquakes
2018
S20180216.1(14.0km)
15 Feb
11 days 1 hours
728 earthquakes
11 Mar
7 hours
28 earthquakes
24 Jul
2 days 20 hours
52 earthquakes
2019
22 Jul
3 days 7 hours
61 earthquakes
26 Oct
1 day 22 hours
83 earthquakes
2020
18 Feb
2 days 20 hours
62 earthquakes
S20200509.3(16.8km)
9 May
2 days 5 hours
80 earthquakes
22 May
2 hours
36 earthquakes
29 May
1 day 10 hours
88 earthquakes
24 Dec
12 hours
47 earthquakes
2021
21 Jun
1 day 13 hours
117 earthquakes
S20210628.1(21.0km)
27 Jun
5 days 17 hours
230 earthquakes
16 Sep
4 days 0 hours
75 earthquakes
27 Sep
7 hours
26 earthquakes
30 Sep
1 day 16 hours
62 earthquakes
S20211005.1(12.3km)
4 Oct
1 day 0 hours
41 earthquakes
25 Nov
2 days 12 hours
61 earthquakes
2022
28 Mar
2 days 12 hours
117 earthquakes
10 Jun
2 days 20 hours
62 earthquakes
26 Aug
9 days 4 hours
198 earthquakes
5 Sep
3 hours
40 earthquakes
17 Sep
6 days 20 hours
389 earthquakes
29 Sep
3 days 4 hours
53 earthquakes
5 Oct
1 day 8 hours
32 earthquakes
13 Oct
8 days 6 hours
111 earthquakes
14 Nov
2 days 5 hours
48 earthquakes
2023
S20230207.2(12.6km)
6 Feb
2 days 9 hours
63 earthquakes
S20230313.1(22.8km)
13 Mar
1 day 18 hours
136 earthquakes
3 Oct
1 day 14 hours
39 earthquakes
2024
1 Jan
1 day 16 hours
47 earthquakes
3 Jan
1 day 15 hours
62 earthquakes
S20240106.1(10.5km)
6 Jan
10 hours
35 earthquakes
18 Feb
9 hours
50 earthquakes
S20240423.1(24.2km)
23 Apr
4 days 7 hours
79 earthquakes
2025
S20250304.1(23.6km)
4 Mar
12 hours
25 earthquakes
S20250507.1(22.1km)
7 May
8 hours
37 earthquakes
AI-generated article — for informational and entertainment purposes only. May contain inaccuracies. Full disclaimerFound an error?

Seismic Swarm S20190326.2: Activity Near West Yellowstone, Montana

Seismic swarm S20190326.2 was recorded on 26 March 2019, approximately 25 km east-northeast of West Yellowstone, Montana. The sequence began at 00:44 UTC and concluded at 21:08 UTC, encompassing a total duration of 20 hours and 23 minutes. During this period, 29 earthquakes were detected, with magnitudes ranging from 0.1 to 1.9 and focal depths between 2 km and 12 km.

The events clustered in two primary phases. An initial group occurred between 00:44 and 04:55 UTC, featuring magnitudes up to 1.8 at depths around 9 km. A more sustained phase followed from 09:01 to 21:08 UTC, including the swarm's largest event of magnitude 1.9 at 09:27 UTC and several events near 2 km depth. Depths showed a general concentration in the upper 10 km of the crust, consistent with shallow crustal processes.

This swarm fits within a broader pattern of seismic activity in the region. Historical records indicate 74 swarms have occurred since 1 January 2000, with notable yearly counts including 10 in 2000, 7 each in 2008, 2013, and 2014, and lower activity in intervening years such as single swarms in 2005, 2010, 2011, and 2016.

The location lies within the Yellowstone volcanic field, a tectonically active area influenced by the underlying mantle hotspot. The region features a large caldera formed by massive eruptions over the past 2 million years, with ongoing hydrothermal systems and ground deformation driven by magmatic and hydrothermal fluids. Earthquake swarms here commonly arise from fluid migration along fractures rather than large tectonic stress release, reflecting the interplay between volcanic and regional extensional tectonics associated with the Basin and Range province.

Seismic monitoring in this zone benefits from dense networks that track both swarms and background seismicity, providing insights into subsurface dynamics. Such events contribute to understanding long-term volcanic unrest without indicating imminent eruptive activity.

References

  • U.S. Geological Survey Earthquake Catalog
  • Yellowstone Volcano Observatory reports on regional seismicity