Location:

Period:

17 Jan 2021 05:28:28 - 18 Jan 2021 12:31:13 (1 day 7 hours 2 minutes)

Volcanoes in 100km radius:

Mono Lake Volcanic Field(79km), Mono-Inyo Craters(85km), Mammoth Mountain(94km)

Earthquakes:

30 swarms found nearby.

2000

S20000509.1(29.8km)

9 May

21 hours

65 earthquakes

S20000607.2(28.6km)

6 Jun

2 days 2 hours

60 earthquakes

S20000622.1(23.8km)

21 Jun

2 days 3 hours

130 earthquakes

S20000801.1(29.1km)

31 Jul

1 day 1 hours

31 earthquakes

S20000818.1(29.4km)

17 Aug

1 day 8 hours

45 earthquakes

2003

S20030529.1(26.1km)

29 May

4 days 7 hours

164 earthquakes

S20031116.1(28.5km)

15 Nov

2 days 1 hours

52 earthquakes

2013

S20130120.1(13.8km)

19 Jan

2 days 18 hours

65 earthquakes

S20130213.1(11.2km)

12 Feb

11 days 5 hours

345 earthquakes

2014

S20140516.1(25.5km)

16 May

9 hours

55 earthquakes

2020

S20200308.1(21.5km)

8 Mar

2 days 23 hours

77 earthquakes

S20200318.1(19.6km)

17 Mar

3 days 22 hours

75 earthquakes

S20200515.1(22.6km)

15 May

295 days 1 hours

21711 earthquakes

S20200516.1(3.4km)

15 May

32 days 11 hours

1150 earthquakes

S20200516.2(10.9km)

15 May

22 hours

26 earthquakes

S20200528.1(12.2km)

27 May

17 days 11 hours

384 earthquakes

S20200615.1(7.4km)

14 Jun

31 days 0 hours

472 earthquakes

S20200708.2(2.6km)

7 Jul

5 days 6 hours

63 earthquakes

S20200726.1(1.5km)

25 Jul

11 days 0 hours

125 earthquakes

S20201211.1(3.3km)

10 Dec

1 day 1 hours

42 earthquakes

S20201220.1(29.1km)

19 Dec

7 days 21 hours

133 earthquakes

2021

S20210101.1(4.6km)

1 Jan

16 hours

24 earthquakes

S20210330.1(27.7km)

29 Mar

19 days 16 hours

285 earthquakes

S20210505.1(24.5km)

4 May

16 days 21 hours

229 earthquakes

S20210927.1(23.9km)

26 Sep

2 days 0 hours

31 earthquakes

S20211001.1(22.1km)

30 Sep

6 days 14 hours

87 earthquakes

S20211016.1(17.3km)

15 Oct

7 days 7 hours

86 earthquakes

S20211029.1(15.6km)

28 Oct

10 days 4 hours

136 earthquakes

2022

S20220105.1(24.9km)

4 Jan

6 days 14 hours

106 earthquakes

S20220123.1(26.2km)

22 Jan

6 days 16 hours

114 earthquakes

AI-generated article — for informational and entertainment purposes only. May contain inaccuracies. Full disclaimerFound an error?

Seismic Swarm S20210117.2: Analysis of Activity South of Mina, Nevada

A seismic swarm designated S20210117.2 was recorded 32 km south of Mina, Nevada, beginning at 05:28 on 17 January 2021 and ending at 12:31 on 18 January 2021. Over 31 hours and 2 minutes, the sequence produced 25 earthquakes. Magnitudes ranged from 0.4 to 2.5, with the largest event occurring at 09:20 on 17 January at a depth of 7 km. Depths across the swarm remained shallow, predominantly between 0 and 12 km, consistent with activity on near-surface fault structures.

The temporal distribution showed clustering in the morning and evening hours of 17 January, followed by a single event the next day. Most events registered below magnitude 2.0, reflecting the low-energy character typical of swarm sequences rather than a mainshock-aftershock pattern. The largest events (magnitudes 2.5, 2.0, and 1.9) occurred at depths of 7 km, 3 km, and 2 km respectively, while numerous smaller events clustered at depths of 0–6 km.

The Mina area lies within the western Basin and Range province of Nevada, specifically influenced by the Walker Lane tectonic belt. This zone accommodates northwest-directed dextral shear and crustal extension between the Pacific and North American plates. Active normal and strike-slip faults in the region facilitate frequent small-magnitude seismicity. Shallow focal depths observed in the swarm align with the brittle upper crust in this extensional setting, where fluid migration or aseismic slip can trigger episodic earthquake clusters.

Historical records indicate persistent swarm activity in the vicinity. Since 1 January 2000, 22 swarms have been documented in the area. Yearly counts include five swarms in 2000, two in 2003, two in 2013, one in 2014, eleven in 2020, and one in 2021. This pattern underscores recurring seismic episodes driven by the same regional fault network.

The 2021 swarm fits within the established low-magnitude, shallow-depth profile of prior events, providing additional data on the ongoing tectonic adjustment along Walker Lane structures.

References
SeismoSight internal swarm classification S20210117.2
USGS Earthquake Hazards Program regional tectonic summaries
Nevada Bureau of Mines and Geology geologic mapping of Mineral County