Location:

Period:

15 Oct 2021 03:41:21 - 22 Oct 2021 11:28:16 (7 days 7 hours 46 minutes)

Volcanoes in 100km radius:

Mono Lake Volcanic Field(96km)

Earthquakes:

24 swarms found nearby.

2003

S20030529.1(13.3km)

29 May

4 days 7 hours

164 earthquakes

S20031116.1(13.0km)

15 Nov

2 days 1 hours

52 earthquakes

2013

S20130120.1(4.4km)

19 Jan

2 days 18 hours

65 earthquakes

S20130213.1(14.1km)

12 Feb

11 days 5 hours

345 earthquakes

2020

S20200515.1(5.4km)

15 May

295 days 1 hours

21711 earthquakes

S20200516.1(15.3km)

15 May

32 days 11 hours

1150 earthquakes

S20200516.2(8.0km)

15 May

22 hours

26 earthquakes

S20200517.1(19.3km)

16 May

11 days 1 hours

418 earthquakes

S20200528.1(9.2km)

27 May

17 days 11 hours

384 earthquakes

S20200615.1(11.2km)

14 Jun

31 days 0 hours

472 earthquakes

S20200708.2(14.9km)

7 Jul

5 days 6 hours

63 earthquakes

S20200726.1(15.9km)

25 Jul

11 days 0 hours

125 earthquakes

S20201020.3(19.2km)

19 Oct

1 day 23 hours

31 earthquakes

S20201203.1(17.9km)

2 Dec

8 days 6 hours

153 earthquakes

S20201211.1(14.0km)

10 Dec

1 day 1 hours

42 earthquakes

S20201220.1(11.8km)

19 Dec

7 days 21 hours

133 earthquakes

2021

S20210101.1(14.6km)

1 Jan

16 hours

24 earthquakes

S20210117.2(17.3km)

17 Jan

1 day 7 hours

25 earthquakes

S20210330.1(10.5km)

29 Mar

19 days 16 hours

285 earthquakes

S20210505.1(7.2km)

4 May

16 days 21 hours

229 earthquakes

S20210927.1(6.7km)

26 Sep

2 days 0 hours

31 earthquakes

S20211001.1(4.9km)

30 Sep

6 days 14 hours

87 earthquakes

S20211029.1(3.2km)

28 Oct

10 days 4 hours

136 earthquakes

2022

S20220105.1(7.8km)

4 Jan

6 days 14 hours

106 earthquakes

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Seismic Swarm S20211016.1: Analysis of Activity Near Mina, Nevada

Seismic swarm S20211016.1 occurred approximately 30 km south-southeast of Mina, Nevada, in Mineral County. The sequence began at 03:41 UTC on 15 October 2021 and concluded at 11:28 UTC on 22 October 2021, spanning 175 hours and 46 minutes. During this period, 86 earthquakes were recorded.

The swarm featured a range of magnitudes, with the largest event reaching 3.7 on 15 October at a depth of 9 km. Most events registered below magnitude 2.0, including numerous micro-earthquakes between 0.3 and 1.8. Depths clustered primarily between 7 and 12 km, though a few outliers extended from 0 km to 16 km. Activity showed a typical swarm pattern, with an initial peak on the first day followed by a gradual decline over the subsequent week.

This event aligns with the region's established pattern of swarm seismicity. Since 2000, 22 swarms have been documented in the area. Notable prior activity includes two swarms each in 2003 and 2013, twelve in 2020, and six in 2021. Such recurrent sequences reflect ongoing tectonic processes rather than isolated mainshock-aftershock sequences.

The Mina region lies within the western Basin and Range Province, specifically along the Walker Lane shear zone. This zone accommodates a portion of the dextral shear between the Pacific and North American plates, resulting in distributed normal and strike-slip faulting. The crust here experiences active extension, with numerous Quaternary faults contributing to moderate seismicity. Historical records indicate that the area has hosted similar swarm activity linked to fluid migration and fault interactions within this transtensional regime.

Geological mapping shows the local bedrock consists of Tertiary volcanic and sedimentary units overlying Mesozoic basement rocks. The combination of high heat flow and fractured crust in the Great Basin facilitates the swarm-type behavior observed in S20211016.1 and previous episodes.

References

SeismoSight internal classification data for swarm S20211016.1
USGS Earthquake Hazards Program regional tectonic summaries
Nevada Bureau of Mines and Geology geologic maps of Mineral County