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Location:
8 km SW of Holtville, CA
Period:
1 Jan 2025 15:19:34 - 1 Jan 2025 17:36:15 (2 hours 16 minutes)
Volcanoes in 100km radius:
Prieto, Cerro(40km), Salton Buttes(51km)
Earthquakes:
28
29 swarms found nearby.
2000
S20000614.1(14.0km)
14 Jun
2 days 16 hours
145 earthquakes
2003
S20030301.1(19.9km)
1 Mar
23 hours
52 earthquakes
S20030524.1(24.8km)
23 May
1 day 22 hours
161 earthquakes
2005
31 Jan
1 day 5 hours
32 earthquakes
2008
2 Jun
4 days 11 hours
54 earthquakes
2009
S20090924.1(30.0km)
24 Sep
19 hours
28 earthquakes
S20091102.1(23.6km)
1 Nov
4 days 17 hours
286 earthquakes
S20091108.1(21.9km)
8 Nov
1 day 14 hours
54 earthquakes
S20091126.1(24.4km)
26 Nov
1 day 0 hours
35 earthquakes
2010
PS20100405.1(62.0km)
4 Apr
1 hours
5 earthquakes
S20100406.1(23.5km)
5 Apr
4 days 7 hours
57 earthquakes
S20100602.1(28.7km)
2 Jun
8 days 18 hours
98 earthquakes
S20101215.1(29.9km)
15 Dec
1 day 4 hours
101 earthquakes
2011
S20110715.2(11.0km)
15 Jul
2 days 3 hours
36 earthquakes
2012
S20120826.1(28.3km)
26 Aug
11 days 23 hours
972 earthquakes
2016
26 Nov
2 days 0 hours
50 earthquakes
S20161231.1(25.5km)
31 Dec
3 days 4 hours
317 earthquakes
2017
13 Mar
12 hours
24 earthquakes
7 Aug
16 hours
40 earthquakes
2019
S20190115.1(14.5km)
15 Jan
4 hours
24 earthquakes
S20191112.1(11.7km)
12 Nov
1 day 4 hours
84 earthquakes
2021
S20210611.1(23.3km)
11 Jun
4 hours
26 earthquakes
2022
S20220420.1(19.6km)
19 Apr
3 days 1 hours
71 earthquakes
2023
S20230428.1(13.6km)
28 Apr
4 days 3 hours
186 earthquakes
2024
12 Feb
3 days 2 hours
363 earthquakes
S20240518.1(21.0km)
18 May
2 days 19 hours
306 earthquakes
S20241009.2(26.4km)
8 Oct
22 hours
25 earthquakes
2026
15 Jan
1 day 18 hours
81 earthquakes
S20260510.1(25.9km)
9 May
4 days 16 hours
477 earthquakes
AI-generated article — for informational and entertainment purposes only. May contain inaccuracies. Full disclaimerFound an error?

Seismic Swarm S20250101.1 Near Holtville, California

A seismic swarm designated S20250101.1 occurred on January 1, 2025, approximately 8 km southwest of Holtville in Imperial County, California. The sequence began at 15:19 UTC and concluded at 17:36 UTC, spanning 2 hours and 16 minutes. During this period, 28 earthquakes were recorded, with magnitudes ranging from 0.9 to 2.8 and focal depths between 3 km and 15 km.

The largest event reached magnitude 2.8 at 15:34:05 UTC at a depth of 15 km. Other notable shocks included magnitudes of 2.7, 2.5 (two events), 2.4, and 2.1. Most activity clustered between 5 km and 12 km depth, consistent with shallow crustal processes in the region. The swarm exhibited a typical pattern of clustered, low-to-moderate magnitude events without a dominant mainshock-aftershock sequence.

This activity aligns with the tectonic setting of the Imperial Valley, part of the broader San Andreas Fault system at the Pacific-North American plate boundary. The area lies within the Brawley Seismic Zone, characterized by right-lateral strike-slip faulting and frequent earthquake swarms driven by crustal extension, geothermal fluids, and magmatic influences near the Salton Sea. Historical records indicate recurrent swarms in this zone, often linked to aseismic slip and fluid migration rather than large tectonic ruptures.

Since 2000, 27 swarms have been documented in the vicinity, distributed across multiple years: one each in 2000, 2005, 2008, 2011, 2012, 2021, 2022, and 2023; two each in 2003, 2016, 2017, and 2019; three in 2024; and four each in 2009 and 2010. These episodes underscore the zone's persistent microseismicity, with events rarely exceeding magnitude 4.0 but serving as indicators of underlying stress accumulation.

The Imperial Valley has experienced significant historical earthquakes, including the 1940 El Centro event (magnitude 6.9) and the 1979 Imperial Valley earthquake (magnitude 6.4), both associated with the Imperial Fault. Ongoing monitoring by regional networks highlights the area's elevated seismic hazard, influenced by proximity to major faults and geothermal fields.

Further analysis of swarm statistics may aid in refining probabilistic models for short-term seismic forecasting in transform-margin environments.

References

  • United States Geological Survey Earthquake Catalog
  • California Geological Survey Regional Fault Maps
  • Southern California Seismic Network Bulletins