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Location:
57 km SSE of Mammoth, Wyoming
Period:
29 Mar 2023 05:18:26 - 31 Mar 2023 11:52:53 (2 days 6 hours 34 minutes)
Volcanoes in 100km radius:
None
Earthquakes:
110
28 swarms found nearby.
2002
8 Oct
3 days 11 hours
120 earthquakes
3 Nov
2 days 6 hours
67 earthquakes
3 Nov
1 day 2 hours
25 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
18 Mar
12 hours
28 earthquakes
2008
27 Dec
8 days 7 hours
823 earthquakes
2009
S20090109.2(23.2km)
9 Jan
1 day 15 hours
35 earthquakes
14 Sep
2 days 16 hours
39 earthquakes
17 Sep
19 hours
25 earthquakes
14 Oct
3 days 23 hours
138 earthquakes
2010
12 Jun
22 hours
28 earthquakes
2011
14 Apr
7 hours
24 earthquakes
2013
6 Jan
1 day 14 hours
54 earthquakes
23 Jun
5 hours
29 earthquakes
2015
4 Sep
4 hours
24 earthquakes
2016
24 Nov
1 day 13 hours
60 earthquakes
2018
11 Apr
1 day 0 hours
114 earthquakes
31 Dec
4 hours
57 earthquakes
2019
29 Aug
14 hours
43 earthquakes
2020
10 Sep
2 days 23 hours
117 earthquakes
1 Dec
2 days 8 hours
114 earthquakes
6 Dec
1 day 7 hours
37 earthquakes
2021
15 Jul
7 days 4 hours
820 earthquakes
2022
2 Mar
1 day 22 hours
33 earthquakes
2023
16 Apr
1 day 20 hours
38 earthquakes
24 Apr
6 hours
31 earthquakes
AI-generated article — for informational and entertainment purposes only. May contain inaccuracies. Full disclaimerFound an error?

SeismoSight Analysis: SVS20230329.1 Earthquake Swarm South-Southeast of Mammoth, Wyoming

The SVS20230329.1 earthquake swarm was recorded 57 km south-southeast of Mammoth, Wyoming, within the Yellowstone volcanic system. This sequence began at 05:18 on 29 March 2023 and concluded at 11:52 on 31 March 2023, spanning 54 hours and 34 minutes. A total of 110 earthquakes were detected during this period, consistent with the characteristic behavior of swarms in this tectonically active region.

Yellowstone lies atop a large volcanic caldera formed by massive eruptions over the past 2.1 million years, with the most recent at approximately 631,000 years ago. The area experiences persistent seismic activity driven by magmatic fluids, hydrothermal circulation, and regional tectonic stresses associated with the Basin and Range province. Earthquake swarms are common here, often linked to fluid migration rather than direct magma movement, and typically involve shallow events at depths of 1 to 6 km.

Analysis of the first 100 events reveals predominantly low-magnitude activity, with the largest reaching 3.7. Magnitudes clustered between 0.5 and 3.0, and most depths remained between 1 and 6 km, indicative of shallow crustal processes. The sequence featured several bursts of elevated activity on 29 March, including multiple events above magnitude 2.5 within a short interval around midday. Subsequent events on 30 March showed a clear decline in both frequency and intensity.

Since 1 January 2000, the region has hosted 26 documented swarms. These occurred in the following years with the specified event counts: 2002 (5), 2004 (1), 2006 (1), 2008 (1), 2009 (4), 2010 (1), 2011 (1), 2013 (2), 2015 (1), 2016 (1), 2018 (2), 2019 (1), 2020 (3), 2021 (1), and 2022 (1). Such recurrent swarms underscore the dynamic nature of the Yellowstone hydrothermal and volcanic environment.

This swarm aligns with historical patterns observed in the area, where small-to-moderate events often occur in clusters without leading to larger mainshock-aftershock sequences. Continued monitoring by seismic networks remains essential for tracking any evolution in activity that could relate to broader volcanic or hydrothermal changes.

References

United States Geological Survey. Yellowstone Volcano Observatory.
SeismoSight internal swarm classification SVS20230329.1.