Note:This page contains AI-generated content for informational and entertainment purposes only. It may contain inaccuracies. Raw event data is from USGS and EMSC. All statistics, lists, and derived information are generated by this site. Full disclaimerFound an error?
Location:
10km NE of Coso Junction, CA
Period:
14 Sep 2019 11:24:03 - 10 Oct 2019 01:48:56 (25 days 14 hours 24 minutes)
Volcanoes in 100km radius:
None
Earthquakes:
387
115 swarms found nearby.
2000
28 Feb
9 days 21 hours
154 earthquakes
S20000329.1(17.8km)
28 Mar
9 days 13 hours
115 earthquakes
S20000911.1(18.3km)
10 Sep
9 days 14 hours
140 earthquakes
S20000921.1(19.0km)
20 Sep
15 days 13 hours
274 earthquakes
2001
S20010408.1(12.5km)
7 Apr
1 day 16 hours
29 earthquakes
S20010423.1(19.8km)
23 Apr
8 days 21 hours
256 earthquakes
S20010610.1(19.8km)
9 Jun
4 days 3 hours
51 earthquakes
S20010714.1(19.4km)
14 Jul
67 days 13 hours
5060 earthquakes
2002
S20020907.1(19.3km)
6 Sep
2 days 1 hours
31 earthquakes
2004
S20040224.2(13.1km)
24 Feb
1 day 20 hours
36 earthquakes
S20040629.1(13.5km)
28 Jun
3 days 22 hours
108 earthquakes
S20040712.1(16.2km)
11 Jul
17 days 11 hours
158 earthquakes
S20040807.1(14.3km)
6 Aug
8 days 18 hours
101 earthquakes
S20040915.1(16.8km)
14 Sep
8 days 20 hours
86 earthquakes
S20040925.1(17.4km)
24 Sep
4 days 9 hours
57 earthquakes
S20041202.1(13.9km)
1 Dec
2 days 18 hours
36 earthquakes
2005
S20050926.1(10.6km)
25 Sep
1 day 9 hours
41 earthquakes
2006
3 Jan
2 days 16 hours
37 earthquakes
23 Mar
4 days 11 hours
67 earthquakes
S20060713.1(17.1km)
12 Jul
6 days 5 hours
67 earthquakes
S20060813.1(24.2km)
12 Aug
8 days 13 hours
97 earthquakes
23 Aug
8 days 12 hours
89 earthquakes
27 Nov
7 days 11 hours
109 earthquakes
2009
31 Dec
1 day 18 hours
54 earthquakes
2010
S20100114.1(12.8km)
13 Jan
11 days 8 hours
443 earthquakes
S20100302.1(20.1km)
1 Mar
5 days 11 hours
44 earthquakes
S20100424.1(12.6km)
23 Apr
2 days 15 hours
41 earthquakes
18 Oct
2 days 0 hours
40 earthquakes
23 Oct
7 days 5 hours
92 earthquakes
25 Nov
1 day 13 hours
36 earthquakes
1 Dec
1 day 12 hours
30 earthquakes
2011
28 Jul
2 days 6 hours
40 earthquakes
2012
S20120106.1(17.1km)
6 Jan
2 days 18 hours
48 earthquakes
15 Oct
5 days 7 hours
74 earthquakes
23 Oct
6 days 5 hours
80 earthquakes
S20121127.1(20.3km)
26 Nov
24 days 0 hours
802 earthquakes
2013
S20130321.1(11.4km)
20 Mar
4 days 15 hours
80 earthquakes
S20130406.1(14.1km)
5 Apr
3 days 20 hours
59 earthquakes
S20130611.1(19.5km)
10 Jun
3 days 18 hours
43 earthquakes
11 Aug
2 days 13 hours
64 earthquakes
2014
20 Mar
1 day 19 hours
35 earthquakes
2015
S20150217.1(10.3km)
16 Feb
11 days 1 hours
139 earthquakes
S20150602.1(19.1km)
1 Jun
1 day 6 hours
36 earthquakes
S20150608.1(21.1km)
8 Jun
1 day 13 hours
31 earthquakes
2016
S20160331.1(12.3km)
30 Mar
1 day 14 hours
27 earthquakes
12 Aug
2 days 10 hours
46 earthquakes
S20160821.1(15.1km)
20 Aug
2 days 0 hours
37 earthquakes
S20161206.1(11.0km)
5 Dec
6 days 9 hours
75 earthquakes
2017
20 May
1 day 16 hours
35 earthquakes
S20170608.1(17.5km)
8 Jun
3 days 3 hours
52 earthquakes
2018
29 Nov
2 days 17 hours
51 earthquakes
2019
S20190318.1(12.0km)
17 Mar
4 days 6 hours
102 earthquakes
10 May
5 days 12 hours
90 earthquakes
S20190705.2(23.8km)
4 Jul
29 days 2 hours
2446 earthquakes
S20190706.2(11.8km)
5 Jul
12 days 23 hours
643 earthquakes
5 Jul
7 days 1 hours
190 earthquakes
S20190706.5(28.5km)
6 Jul
8 days 16 hours
302 earthquakes
S20190708.2(27.2km)
7 Jul
4 days 17 hours
70 earthquakes
S20190712.1(24.5km)
11 Jul
16 hours
29 earthquakes
S20190721.1(20.3km)
20 Jul
9 days 5 hours
474 earthquakes
2 Aug
2 days 8 hours
77 earthquakes
4 Aug
41 days 17 hours
1154 earthquakes
14 Aug
2 days 19 hours
120 earthquakes
S20190819.2(12.7km)
19 Aug
1 day 7 hours
38 earthquakes
20 Aug
3 days 6 hours
383 earthquakes
S20190825.1(21.2km)
24 Aug
3 days 7 hours
165 earthquakes
2 Sep
1 day 14 hours
76 earthquakes
4 Sep
3 days 10 hours
79 earthquakes
S20190910.1(28.8km)
10 Sep
3 days 21 hours
145 earthquakes
S20190918.1(12.8km)
17 Sep
14 days 12 hours
471 earthquakes
S20191005.1(20.1km)
5 Oct
3 days 16 hours
147 earthquakes
S20191007.1(10.7km)
6 Oct
1 day 16 hours
48 earthquakes
S20191011.1(11.7km)
10 Oct
4 days 18 hours
165 earthquakes
17 Oct
21 days 21 hours
614 earthquakes
S20191108.1(11.3km)
7 Nov
9 days 8 hours
234 earthquakes
S20191116.2(16.7km)
16 Nov
3 days 4 hours
90 earthquakes
S20191119.1(10.3km)
18 Nov
10 days 3 hours
223 earthquakes
S20191201.1(19.2km)
30 Nov
27 days 2 hours
353 earthquakes
S20191211.1(11.3km)
10 Dec
2 days 14 hours
78 earthquakes
14 Dec
1 day 17 hours
43 earthquakes
2020
S20200101.1(15.5km)
1 Jan
7 days 0 hours
130 earthquakes
S20200107.2(16.0km)
7 Jan
11 days 11 hours
163 earthquakes
S20200109.2(10.7km)
8 Jan
23 hours
27 earthquakes
S20200212.1(13.7km)
11 Feb
230 days 17 hours
4310 earthquakes
18 Feb
3 days 4 hours
87 earthquakes
27 Feb
7 days 2 hours
113 earthquakes
S20200307.1(20.8km)
6 Mar
10 days 22 hours
145 earthquakes
S20200309.1(10.8km)
8 Mar
12 days 22 hours
242 earthquakes
S20200323.1(27.7km)
23 Mar
4 days 2 hours
52 earthquakes
S20200324.1(19.7km)
23 Mar
6 days 13 hours
82 earthquakes
S20200403.1(10.0km)
2 Apr
3 days 6 hours
67 earthquakes
22 Apr
2 days 13 hours
45 earthquakes
S20200509.2(17.6km)
8 May
3 days 23 hours
49 earthquakes
S20200521.1(11.9km)
20 May
4 days 3 hours
97 earthquakes
S20200527.1(10.5km)
26 May
3 days 23 hours
82 earthquakes
12 Jun
15 days 8 hours
334 earthquakes
S20200708.3(18.8km)
7 Jul
13 days 9 hours
239 earthquakes
21 Aug
4 days 6 hours
66 earthquakes
26 Aug
25 days 23 hours
356 earthquakes
S20201003.1(10.9km)
2 Oct
25 days 20 hours
320 earthquakes
9 Oct
3 days 6 hours
59 earthquakes
S20201113.2(14.8km)
12 Nov
13 days 17 hours
181 earthquakes
2021
S20210213.1(24.0km)
12 Feb
1 day 17 hours
29 earthquakes
S20210404.1(20.2km)
3 Apr
11 days 13 hours
124 earthquakes
S20210412.1(28.9km)
11 Apr
2 days 3 hours
33 earthquakes
S20210616.1(16.2km)
15 Jun
4 days 20 hours
83 earthquakes
S20210820.2(11.0km)
19 Aug
19 days 14 hours
212 earthquakes
S20211029.2(17.0km)
29 Oct
3 days 9 hours
48 earthquakes
S20211219.1(20.4km)
18 Dec
13 days 0 hours
143 earthquakes
2022
25 Jan
2 days 8 hours
59 earthquakes
3 Feb
3 days 0 hours
45 earthquakes
S20220608.1(11.6km)
7 Jun
1 day 20 hours
34 earthquakes
2023
S20230503.1(18.3km)
2 May
1 day 6 hours
32 earthquakes
2024
S20240416.2(23.2km)
15 Apr
2 days 15 hours
51 earthquakes
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 S20190915.1 Near Coso Junction, California

Seismic swarm S20190915.1 was recorded 10 km northeast of Coso Junction, California. Activity began at 11:24 on 14 September 2019 and concluded at 01:48 on 10 October 2019, spanning 614 hours and 24 minutes. A total of 387 earthquakes were registered during this period.

The Coso region lies within the Basin and Range province of eastern California, adjacent to the Coso Volcanic Field. This area features Quaternary rhyolite domes, basaltic flows, and extensive geothermal systems driven by shallow crustal heat sources. Tectonic extension along northwest-trending normal faults interacts with magmatic processes, producing frequent earthquake swarms. Geothermal energy production at the Coso facility further influences local seismicity through fluid injection and extraction.

Analysis of the first 100 events reveals predominantly low-magnitude earthquakes. Magnitudes ranged from 0.4 to 2.4, with the majority between 0.8 and 1.6. Depths were shallow, concentrated between 1 and 4 km, although isolated events reached 10 km. The initial sequence showed rapid onset with events occurring within minutes on 14 September, followed by sustained activity over subsequent days. Notable events included a magnitude 2.4 quake on 16 September at 2 km depth and several magnitude 2.0–2.3 shocks clustered at depths of 1–2 km. No clear migration pattern was evident in the early catalog, consistent with fluid-driven swarm behavior rather than mainshock-aftershock sequences.

Historical records indicate persistent swarm activity in the region. Since 2000, 69 swarms have been documented, with notable yearly counts including 7 in 2004, 7 in 2010, and 18 in 2019. This frequency underscores the area's elevated seismic hazard linked to both tectonic and geothermal factors.

The swarm S20190915.1 aligns with established patterns of microseismicity in the Coso Volcanic Field. Continued monitoring remains essential for assessing potential links to deeper magmatic or hydrothermal processes.

References

USGS Earthquake Catalog
Coso Volcanic Field geological summaries (California Geological Survey)
SeismoSight internal swarm classification records