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Location:
10km NE of Coso Junction, CA
Period:
23 Mar 2020 07:32:18 - 29 Mar 2020 21:08:30 (6 days 13 hours 36 minutes)
Volcanoes in 100km radius:
None
Earthquakes:
82
111 swarms found nearby.
2000
S20000229.1(21.6km)
28 Feb
9 days 21 hours
154 earthquakes
28 Mar
9 days 13 hours
115 earthquakes
10 Sep
9 days 14 hours
140 earthquakes
20 Sep
15 days 13 hours
274 earthquakes
2001
7 Apr
1 day 16 hours
29 earthquakes
23 Apr
8 days 21 hours
256 earthquakes
9 Jun
4 days 3 hours
51 earthquakes
14 Jul
67 days 13 hours
5060 earthquakes
2002
S20020721.1(14.6km)
20 Jul
3 days 21 hours
49 earthquakes
6 Sep
2 days 1 hours
31 earthquakes
2004
24 Feb
1 day 20 hours
36 earthquakes
S20040328.1(28.9km)
28 Mar
4 days 0 hours
71 earthquakes
S20040402.1(28.0km)
2 Apr
1 day 9 hours
28 earthquakes
28 Jun
3 days 22 hours
108 earthquakes
11 Jul
17 days 11 hours
158 earthquakes
6 Aug
8 days 18 hours
101 earthquakes
S20040915.1(10.7km)
14 Sep
8 days 20 hours
86 earthquakes
24 Sep
4 days 9 hours
57 earthquakes
1 Dec
2 days 18 hours
36 earthquakes
2005
S20050806.1(19.8km)
6 Aug
7 days 5 hours
120 earthquakes
S20050926.1(10.2km)
25 Sep
1 day 9 hours
41 earthquakes
2006
S20060104.1(14.6km)
3 Jan
2 days 16 hours
37 earthquakes
S20060324.1(11.2km)
23 Mar
4 days 11 hours
67 earthquakes
12 Jul
6 days 5 hours
67 earthquakes
12 Aug
8 days 13 hours
97 earthquakes
S20060824.1(12.4km)
23 Aug
8 days 12 hours
89 earthquakes
S20061127.1(15.7km)
27 Nov
7 days 11 hours
109 earthquakes
2009
S20091231.1(15.9km)
31 Dec
1 day 18 hours
54 earthquakes
2010
13 Jan
11 days 8 hours
443 earthquakes
1 Mar
5 days 11 hours
44 earthquakes
23 Apr
2 days 15 hours
41 earthquakes
S20101019.1(19.0km)
18 Oct
2 days 0 hours
40 earthquakes
S20101024.1(16.0km)
23 Oct
7 days 5 hours
92 earthquakes
S20101125.1(10.8km)
25 Nov
1 day 13 hours
36 earthquakes
S20101202.1(22.8km)
1 Dec
1 day 12 hours
30 earthquakes
2011
S20110728.1(21.0km)
28 Jul
2 days 6 hours
40 earthquakes
2012
6 Jan
2 days 18 hours
48 earthquakes
S20121016.1(24.6km)
15 Oct
5 days 7 hours
74 earthquakes
S20121024.1(14.5km)
23 Oct
6 days 5 hours
80 earthquakes
26 Nov
24 days 0 hours
802 earthquakes
2013
20 Mar
4 days 15 hours
80 earthquakes
5 Apr
3 days 20 hours
59 earthquakes
10 Jun
3 days 18 hours
43 earthquakes
S20130804.1(21.1km)
4 Aug
1 day 20 hours
50 earthquakes
S20130812.1(19.5km)
11 Aug
2 days 13 hours
64 earthquakes
S20131223.1(22.4km)
23 Dec
5 days 10 hours
116 earthquakes
2014
S20140321.1(11.5km)
20 Mar
1 day 19 hours
35 earthquakes
S20140701.1(15.2km)
30 Jun
8 days 23 hours
167 earthquakes
2015
S20150217.1(22.2km)
16 Feb
11 days 1 hours
139 earthquakes
8 Jun
1 day 13 hours
31 earthquakes
2016
30 Mar
1 day 14 hours
27 earthquakes
S20160813.1(23.1km)
12 Aug
2 days 10 hours
46 earthquakes
S20160821.1(10.5km)
20 Aug
2 days 0 hours
37 earthquakes
S20161206.1(10.3km)
5 Dec
6 days 9 hours
75 earthquakes
2017
S20170521.1(10.4km)
20 May
1 day 16 hours
35 earthquakes
S20170608.1(10.5km)
8 Jun
3 days 3 hours
52 earthquakes
2018
S20181130.1(15.1km)
29 Nov
2 days 17 hours
51 earthquakes
2019
17 Mar
4 days 6 hours
102 earthquakes
S20190511.1(12.0km)
10 May
5 days 12 hours
90 earthquakes
S20190706.2(22.4km)
5 Jul
12 days 23 hours
643 earthquakes
S20190706.3(21.3km)
5 Jul
7 days 1 hours
190 earthquakes
20 Jul
9 days 5 hours
474 earthquakes
S20190803.1(20.2km)
2 Aug
2 days 8 hours
77 earthquakes
S20190804.1(19.9km)
4 Aug
41 days 17 hours
1154 earthquakes
S20190815.1(21.8km)
14 Aug
2 days 19 hours
120 earthquakes
S20190819.2(28.5km)
19 Aug
1 day 7 hours
38 earthquakes
S20190821.1(21.6km)
20 Aug
3 days 6 hours
383 earthquakes
S20190902.1(23.8km)
2 Sep
1 day 14 hours
76 earthquakes
S20190905.2(22.5km)
4 Sep
3 days 10 hours
79 earthquakes
S20190915.1(19.7km)
14 Sep
25 days 14 hours
387 earthquakes
S20190918.1(28.2km)
17 Sep
14 days 12 hours
471 earthquakes
S20191007.1(23.3km)
6 Oct
1 day 16 hours
48 earthquakes
S20191011.1(27.5km)
10 Oct
4 days 18 hours
165 earthquakes
S20191018.2(21.4km)
17 Oct
21 days 21 hours
614 earthquakes
S20191108.1(25.0km)
7 Nov
9 days 8 hours
234 earthquakes
16 Nov
3 days 4 hours
90 earthquakes
S20191119.1(25.0km)
18 Nov
10 days 3 hours
223 earthquakes
30 Nov
27 days 2 hours
353 earthquakes
S20191211.1(25.9km)
10 Dec
2 days 14 hours
78 earthquakes
S20191214.2(24.6km)
14 Dec
1 day 17 hours
43 earthquakes
2020
7 Jan
11 days 11 hours
163 earthquakes
S20200109.2(27.1km)
8 Jan
23 hours
27 earthquakes
S20200212.1(27.9km)
11 Feb
230 days 17 hours
4310 earthquakes
S20200219.2(23.4km)
18 Feb
3 days 4 hours
87 earthquakes
S20200228.1(14.7km)
27 Feb
7 days 2 hours
113 earthquakes
6 Mar
10 days 22 hours
145 earthquakes
S20200309.1(26.6km)
8 Mar
12 days 22 hours
242 earthquakes
S20200403.1(26.2km)
2 Apr
3 days 6 hours
67 earthquakes
S20200423.1(21.1km)
22 Apr
2 days 13 hours
45 earthquakes
8 May
3 days 23 hours
49 earthquakes
S20200521.1(26.2km)
20 May
4 days 3 hours
97 earthquakes
S20200527.1(26.8km)
26 May
3 days 23 hours
82 earthquakes
S20200604.2(12.5km)
3 Jun
5 days 19 hours
148 earthquakes
S20200613.1(21.5km)
12 Jun
15 days 8 hours
334 earthquakes
S20200822.1(24.0km)
21 Aug
4 days 6 hours
66 earthquakes
S20200827.1(24.3km)
26 Aug
25 days 23 hours
356 earthquakes
S20201003.1(27.5km)
2 Oct
25 days 20 hours
320 earthquakes
S20201010.1(23.0km)
9 Oct
3 days 6 hours
59 earthquakes
2021
S20210117.1(23.8km)
17 Jan
9 hours
25 earthquakes
12 Feb
1 day 17 hours
29 earthquakes
S20210412.1(10.3km)
11 Apr
2 days 3 hours
33 earthquakes
15 Jun
4 days 20 hours
83 earthquakes
S20210820.2(25.3km)
19 Aug
19 days 14 hours
212 earthquakes
S20211018.1(13.5km)
17 Oct
1 day 7 hours
27 earthquakes
29 Oct
3 days 9 hours
48 earthquakes
18 Dec
13 days 0 hours
143 earthquakes
2022
S20220126.1(24.4km)
25 Jan
2 days 8 hours
59 earthquakes
S20220204.1(21.7km)
3 Feb
3 days 0 hours
45 earthquakes
S20220608.1(25.2km)
7 Jun
1 day 20 hours
34 earthquakes
2024
15 Apr
2 days 15 hours
51 earthquakes
S20240811.1(23.0km)
10 Aug
5 days 16 hours
78 earthquakes
AI-generated article — for informational and entertainment purposes only. May contain inaccuracies. Full disclaimerFound an error?

Seismic Swarm S20200324.1 Near Coso Junction, California

Seismic swarm S20200324.1 occurred approximately 10 km northeast of Coso Junction in California. The sequence began at 07:32 UTC on 23 March 2020 and concluded at 21:08 UTC on 29 March 2020, spanning 157 hours and 36 minutes. During this period, 82 earthquakes were recorded, with the majority exhibiting magnitudes below 2.0 and focal depths ranging from 0 to 7 km.

The swarm displayed typical characteristics of clustered microseismicity, with events distributed across shallow crustal levels. Peak activity concentrated in the first 48 hours, including the largest event of magnitude 2.9 at 17:01 UTC on 24 March at 2 km depth. Subsequent days showed a gradual decline in frequency, punctuated by isolated events up to magnitude 2.8. Depths remained predominantly between 2 and 4 km, consistent with activity in the upper crust.

This swarm aligns with the region's established pattern of episodic earthquake clusters. Historical records since 2000 document 87 such swarms, with notable increases in 2019 (23 swarms) and 2020 (7 swarms). Earlier years show variable rates, such as 9 swarms in 2004 and 7 in 2010, reflecting persistent seismic unrest.

The Coso region lies within the Coso Volcanic Field, a Quaternary volcanic province in eastern California. This area features rhyolitic domes, basaltic flows, and an active geothermal system driven by shallow heat sources. Tectonic setting involves the intersection of the Basin and Range province with the Sierra Nevada frontal fault system, promoting both extensional faulting and magmatic intrusion. Geothermal production at the Coso facility has operated since the 1980s, with ongoing monitoring by the U.S. Geological Survey and regional networks confirming recurrent swarms linked to fluid migration and minor crustal deformation.

Such swarms contribute to understanding local stress regimes and hydrothermal dynamics without evidence of escalation to larger tectonic events in this instance. Continued surveillance supports hazard assessment in this geothermally active zone.

References

  • U.S. Geological Survey Earthquake Catalog
  • California Geological Survey Regional Reports
  • Geothermal Resources Council Publications on Coso Field