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Location:
10km S of Idyllwild, CA
Period:
26 Jan 2014 22:26:27 - 29 Jan 2014 02:28:26 (2 days 4 hours 1 minute)
Volcanoes in 100km radius:
None
Earthquakes:
38
51 swarms found nearby.
2002
S20021024.3(28.8km)
23 Oct
2 days 17 hours
38 earthquakes
2003
5 Mar
1 day 2 hours
35 earthquakes
2005
S20050612.1(29.0km)
12 Jun
26 days 19 hours
904 earthquakes
2009
25 Jul
1 day 19 hours
29 earthquakes
2011
1 Feb
1 day 18 hours
43 earthquakes
S20110416.1(26.4km)
15 Apr
7 days 6 hours
90 earthquakes
S20110727.1(29.3km)
26 Jul
4 days 1 hours
42 earthquakes
2014
S20140418.1(14.0km)
18 Apr
8 days 7 hours
191 earthquakes
9 May
2 days 9 hours
44 earthquakes
2015
10 Feb
12 days 21 hours
168 earthquakes
2016
14 Jun
7 days 5 hours
80 earthquakes
21 Dec
1 day 21 hours
34 earthquakes
S20161230.1(28.8km)
29 Dec
4 days 7 hours
48 earthquakes
2017
S20170503.1(19.6km)
2 May
5 days 5 hours
91 earthquakes
S20170510.1(18.7km)
9 May
15 days 6 hours
129 earthquakes
8 Jun
3 days 22 hours
61 earthquakes
S20170727.1(19.7km)
26 Jul
14 days 9 hours
192 earthquakes
S20170907.1(18.5km)
6 Sep
14 days 21 hours
245 earthquakes
25 Sep
124 days 21 hours
2217 earthquakes
2018
S20180203.1(12.5km)
2 Feb
28 days 21 hours
426 earthquakes
S20180305.1(18.7km)
4 Mar
19 days 17 hours
203 earthquakes
S20180403.1(19.0km)
2 Apr
10 days 14 hours
197 earthquakes
S20180420.1(18.9km)
19 Apr
69 days 21 hours
1109 earthquakes
26 May
4 days 20 hours
54 earthquakes
S20180630.1(19.7km)
29 Jun
41 days 14 hours
582 earthquakes
S20180811.1(19.0km)
11 Aug
209 days 15 hours
6032 earthquakes
2019
S20190328.1(21.0km)
27 Mar
5 days 20 hours
79 earthquakes
S20190426.1(19.3km)
25 Apr
1 day 22 hours
37 earthquakes
2020
S20200109.1(11.8km)
8 Jan
11 days 9 hours
159 earthquakes
S20200122.1(18.2km)
21 Jan
3 days 12 hours
57 earthquakes
1 Feb
8 days 17 hours
147 earthquakes
29 Feb
6 days 16 hours
67 earthquakes
S20200526.3(12.5km)
25 May
7 days 18 hours
100 earthquakes
S20200607.1(17.2km)
6 Jun
9 days 19 hours
109 earthquakes
S20200703.1(17.1km)
2 Jul
3 days 16 hours
70 earthquakes
S20200708.1(18.7km)
7 Jul
26 days 8 hours
287 earthquakes
25 Sep
3 days 10 hours
42 earthquakes
18 Dec
5 days 0 hours
66 earthquakes
2021
27 Mar
2 days 21 hours
33 earthquakes
26 Apr
5 days 5 hours
80 earthquakes
S20210609.1(19.4km)
8 Jun
5 days 16 hours
126 earthquakes
20 Sep
8 days 7 hours
216 earthquakes
2022
18 Apr
8 days 1 hours
76 earthquakes
1 Jul
3 days 23 hours
49 earthquakes
25 Oct
1 day 10 hours
35 earthquakes
2023
S20230221.1(12.9km)
20 Feb
1 day 17 hours
25 earthquakes
S20230305.1(17.0km)
5 Mar
1 day 2 hours
25 earthquakes
25 Mar
2 days 6 hours
38 earthquakes
2024
28 Aug
2 days 1 hours
31 earthquakes
2025
S20250516.1(15.0km)
16 May
4 days 7 hours
45 earthquakes
28 Nov
7 days 2 hours
82 earthquakes
AI-generated article — for informational and entertainment purposes only. May contain inaccuracies. Full disclaimerFound an error?

Seismic Swarm S20140127.1: Analysis of Activity Near Idyllwild, California

A seismic swarm designated S20140127.1 occurred 10 km south of Idyllwild in Southern California’s San Jacinto Mountains. The sequence began at 22:26 UTC on 26 January 2014 and concluded at 02:28 UTC on 29 January 2014, spanning 52 hours and 1 minute. During this interval, 38 earthquakes were recorded, with magnitudes ranging from 0.0 to 3.1 and focal depths between 13 km and 17 km.

The largest event reached magnitude 3.1 at 12:42:38 UTC on 27 January at 15 km depth. This was followed within minutes by a magnitude 2.5 shock. Subsequent activity remained below magnitude 2.0, with events distributed across shallow crustal depths typical of the local fault network. The swarm exhibited classic characteristics of clustered microseismicity, featuring an initial energetic phase on 27 January followed by a gradual decline over the next two days.

The Idyllwild area lies within the Peninsular Ranges province, where northwest-trending strike-slip faults accommodate right-lateral shear between the Pacific and North American plates. The nearby San Jacinto Fault Zone forms a major strand of the San Andreas system and has produced multiple moderate-to-large earthquakes in the historical record. Crustal velocities and geodetic measurements indicate ongoing strain accumulation along these structures, consistent with the observed swarm depths.

Since 1 January 2000, seven swarms have been documented in the immediate region. Prior episodes occurred in 2002, 2003, 2005, 2009, and three separate swarms in 2011. These recurrent clusters suggest episodic fluid migration or stress triggering within the fault zone rather than mainshock-aftershock sequences driven by a single large rupture.

No damage or felt reports of significance accompanied the 2014 swarm, reflecting the small magnitudes involved. Continued monitoring remains essential given the proximity of active faults to populated areas of the San Jacinto Mountains and nearby valleys.

References

USGS Earthquake Catalog
Southern California Seismic Network bulletins
California Geological Survey fault database