Location:

Period:

28 Oct 2021 02:40:57 - 7 Nov 2021 07:36:45 (10 days 4 hours 55 minutes)

Volcanoes in 100km radius:

Mono Lake Volcanic Field(94km)

Earthquakes:

136

24 swarms found nearby.

2003

S20030529.1(12.2km)

29 May

4 days 7 hours

164 earthquakes

S20031116.1(13.2km)

15 Nov

2 days 1 hours

52 earthquakes

2013

S20130120.1(1.8km)

19 Jan

2 days 18 hours

65 earthquakes

S20130213.1(14.7km)

12 Feb

11 days 5 hours

345 earthquakes

2020

S20200515.1(7.3km)

15 May

295 days 1 hours

21711 earthquakes

S20200516.1(13.2km)

15 May

32 days 11 hours

1150 earthquakes

S20200516.2(5.3km)

15 May

22 hours

26 earthquakes

S20200517.1(20.7km)

16 May

11 days 1 hours

418 earthquakes

S20200528.1(6.1km)

27 May

17 days 11 hours

384 earthquakes

S20200615.1(8.8km)

14 Jun

31 days 0 hours

472 earthquakes

S20200708.2(13.1km)

7 Jul

5 days 6 hours

63 earthquakes

S20200726.1(14.4km)

25 Jul

11 days 0 hours

125 earthquakes

S20201020.3(21.1km)

19 Oct

1 day 23 hours

31 earthquakes

S20201203.1(19.8km)

2 Dec

8 days 6 hours

153 earthquakes

S20201211.1(12.3km)

10 Dec

1 day 1 hours

42 earthquakes

S20201220.1(13.8km)

19 Dec

7 days 21 hours

133 earthquakes

2021

S20210101.1(12.4km)

1 Jan

16 hours

24 earthquakes

S20210117.2(15.6km)

17 Jan

1 day 7 hours

25 earthquakes

S20210330.1(12.3km)

29 Mar

19 days 16 hours

285 earthquakes

S20210505.1(9.5km)

4 May

16 days 21 hours

229 earthquakes

S20210927.1(8.8km)

26 Sep

2 days 0 hours

31 earthquakes

S20211001.1(6.8km)

30 Sep

6 days 14 hours

87 earthquakes

S20211016.1(3.2km)

15 Oct

7 days 7 hours

86 earthquakes

2022

S20220105.1(9.4km)

4 Jan

6 days 14 hours

106 earthquakes

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Seismic Swarm S20211029.1 Near Mina, Nevada: Geological Context and Event Analysis

Seismic swarm S20211029.1 was recorded 35 km southeast of Mina, Nevada, beginning at 02:40 on 28 October 2021 and concluding at 07:36 on 7 November 2021. Over 244 hours and 55 minutes, the sequence produced 136 earthquakes. Analysis of the first 100 events reveals predominantly low-magnitude activity with hypocentral depths ranging from 1 to 15 km.

The earliest events on 28 October included magnitudes between 0.4 and 1.7 at depths of 1–12 km. Subsequent activity through 29–31 October maintained similar characteristics, with occasional peaks reaching magnitude 2.3 on 29 October at 9 km depth. Early November events continued this pattern, featuring magnitudes up to 1.8 and depths clustered around 7–11 km. The swarm exhibited typical swarm behavior: a gradual onset, lack of a single dominant mainshock, and sustained low-level seismicity distributed across multiple small faults.

The Mina region lies within the western Basin and Range Province, where crustal extension drives normal faulting along north- to northwest-striking structures. This tectonic regime produces frequent earthquake swarms as strain is accommodated across distributed fault networks rather than through large, singular ruptures. Depths observed in the swarm align with the brittle-ductile transition zone typical of the area, generally between 5 and 15 km.

Historical records indicate elevated swarm activity since 2000, with 23 documented swarms through 2021. Notable clusters occurred in 2003 (two swarms), 2013 (two swarms), 2020 (12 swarms), and 2021 (seven swarms). This recent increase may reflect accelerated extension rates or fluid migration along pre-existing faults in the Walker Lane transition zone east of the Sierra Nevada.

The provided event parameters confirm consistent shallow crustal involvement without escalation to damaging magnitudes. Such swarms contribute to ongoing strain release and help refine models of regional fault connectivity.

References

SeismoSight internal swarm classification S20211029.1 dataset (2021).
USGS Earthquake Catalog for regional context on Basin and Range seismicity.