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Location:
12km NNE of Ocotillo, CA
Period:
2 Jun 2010 02:49:21 - 10 Jun 2010 20:52:53 (8 days 18 hours 3 minutes)
Volcanoes in 100km radius:
Prieto, Cerro(43km), Salton Buttes(63km)
Earthquakes:
98
26 swarms found nearby.
2005
S20050201.1(29.0km)
31 Jan
1 day 5 hours
32 earthquakes
2008
S20080603.1(27.6km)
2 Jun
4 days 11 hours
54 earthquakes
2009
1 Nov
4 days 17 hours
286 earthquakes
8 Nov
1 day 14 hours
54 earthquakes
26 Nov
1 day 0 hours
35 earthquakes
2010
PS20100405.1(58.8km)
4 Apr
1 hours
5 earthquakes
S20100405.2(10.0km)
4 Apr
20 days 15 hours
840 earthquakes
S20100405.8(26.0km)
5 Apr
5 days 23 hours
131 earthquakes
5 Apr
4 days 7 hours
57 earthquakes
S20100504.1(24.4km)
3 May
2 days 2 hours
89 earthquakes
28 May
83 days 1 hours
3232 earthquakes
S20100701.1(12.9km)
30 Jun
2 days 2 hours
35 earthquakes
S20100724.2(23.6km)
23 Jul
4 days 12 hours
62 earthquakes
9 Dec
5 days 20 hours
59 earthquakes
S20101218.1(10.0km)
17 Dec
2 days 1 hours
36 earthquakes
2011
8 Apr
2 days 21 hours
41 earthquakes
2016
S20161127.1(29.8km)
26 Nov
2 days 0 hours
50 earthquakes
2017
S20170807.1(29.4km)
7 Aug
16 hours
40 earthquakes
2019
S20191112.1(22.6km)
12 Nov
1 day 4 hours
84 earthquakes
2021
S20210201.1(18.7km)
31 Jan
3 days 21 hours
68 earthquakes
S20210208.1(18.4km)
7 Feb
4 days 3 hours
49 earthquakes
2023
S20230428.1(15.1km)
28 Apr
4 days 3 hours
186 earthquakes
S20231202.1(20.5km)
1 Dec
3 days 16 hours
64 earthquakes
2024
S20240212.1(27.1km)
12 Feb
3 days 2 hours
363 earthquakes
2025
S20250101.1(28.7km)
1 Jan
2 hours
28 earthquakes
2026
S20260115.1(29.0km)
15 Jan
1 day 18 hours
81 earthquakes
AI-generated article — for informational and entertainment purposes only. May contain inaccuracies. Full disclaimerFound an error?

Seismic Swarm S20100602.1: Analysis of Earthquake Activity Near Ocotillo, California

Seismic swarm S20100602.1 was recorded from 02:49 on 2 June 2010 to 20:52 on 10 June 2010, centered 12 km NNE of Ocotillo, California. Over 210 hours and 3 minutes, the event sequence produced 98 earthquakes. This swarm exemplifies clustered seismic activity typical of the tectonically dynamic Salton Trough region.

The sequence initiated with low-magnitude events around 1.4 to 1.6 at depths of 8 km. Early peaks included two magnitude 2.9 shocks on 2 June at depths of 9 km and 3 km. Subsequent activity featured frequent events between magnitudes 1.0 and 2.0, with depths ranging from 0 km to 11 km. Notable later events encompassed a magnitude 2.7 on 5 June at 8 km depth and a magnitude 2.6 on 7 June at 8 km depth. The swarm concluded with smaller events near magnitude 1.0 to 1.3. Depths predominantly clustered between 3 km and 9 km, indicating shallow crustal involvement.

Ocotillo lies within the Imperial Valley portion of the Salton Trough, a pull-apart basin formed by oblique extension along the Pacific-North American plate boundary. The area experiences distributed faulting associated with the San Andreas system, including the Coyote Creek, Superstition Hills, and Elsinore faults. High heat flow and sedimentary infill contribute to elevated seismicity rates. Historical records show recurrent swarm activity linked to fluid migration and stress transfer in this extensional regime.

Since 1 January 2000, eleven swarms have occurred in the vicinity. Prior episodes took place in 2005 (1 swarm), 2008 (1 swarm), 2009 (3 swarms), and 2010 (6 swarms). These patterns align with the region's history of episodic unrest rather than isolated mainshock-aftershock sequences.

Geological context reveals ongoing rifting that connects the Gulf of California to the San Andreas Fault. The 2010 swarm postdated the April 2010 El Mayor-Cucapah earthquake, suggesting possible triggering through regional stress adjustments. Depths under 11 km reflect brittle failure in the upper crust above ductile lower layers influenced by magmatic and hydrothermal processes.

This swarm underscores the importance of continuous monitoring in tectonically active basins. Data from the sequence provide insights into fault interactions and precursory signals for larger events along the plate boundary.

References

SeismoSight internal swarm classification records.
US Geological Survey earthquake catalog for Imperial County, California.
California Geological Survey regional fault maps and Salton Trough tectonic summaries.