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M0.4 earthquake 29 km WSW of Oasis, California, United States

A magnitude 0.4 earthquake struck 29 km WSW of Oasis, California, United States at 18:25 local time (01:25 UTC) on 25 Sept 2026, at a depth of 11 km, according to USGS.

Data: USGS · updated 2026-09-28 13:59 UTC · reviewed

Magnitude
0.4micro
local magnitude (Richter) (ml)
Depth
10.7 km
Status
Reviewed
Origin time
2026-09-26 01:25:24 UTC
Local: 25 Sept 2026, 18:25:24 (America/Los Angeles)
Epicentre
33.408° N, 116.406° W

Circles show this event and others within 30 km from 7 days before to 30 days after. Lines: plate boundaries and GEM active faults. Open on the live map

Nearby places

Distance and estimated shaking at nearby places
PlaceDistanceEst. shaking
OasisCalifornia, United States · pop. 6,89029 kmINot felt
La QuintaCalifornia, United States · pop. 40,47629 kmINot felt
Palm DesertCalifornia, United States · pop. 51,86935 kmINot felt
CoachellaCalifornia, United States · pop. 44,63537 kmINot felt
IndioCalifornia, United States · pop. 87,53339 kmINot felt
San DiegoCalifornia, United States · pop. 1,404,452104 kmINot felt
Chula VistaCalifornia, United States · pop. 265,757106 kmINot felt
RiversideCalifornia, United States · pop. 317,261110 kmINot felt

Shaking is an estimate from the intensity prediction equation of Allen, Wald & Worden (2012), not an observation. Local ground and buildings can change it by a level or more.

Every agency's solution

Agencies locate earthquakes with their own stations and methods, so their numbers differ. We match reports of the same event by time, distance and magnitude and show them side by side. The headline uses USGS · CI, which has been reviewed by an analyst.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · CIheadlineSouthern California Seismic Network via U.S. Geological Survey0.4 ml10.7 km33.41° N, 116.41° W–Reviewed

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How big was it?

Usually not felt. Recorded by nearby seismometers; thousands occur worldwide every day.

It released roughly the energy of 56 g of TNT. Magnitude is logarithmic: each whole step means about 32 times more energy and 10 times larger waves on a seismogram. Depth matters too: at 11 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M1.0 releases about 8.5× the energy of M0.4, and its waves are about 4.2× taller on a seismogram. Energy: 477 g of TNT vs 56 g of TNT.

Each square is the energy of one M0.4. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

23 later earthquakes within 30 km; the largest was M2.3 1 day ago. 28 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M0.4

23 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
3.690.514
5.540.95
8.320.37
11.92-0.06
16.370.210
26.071.614
26.071.620
26.072.314
26.091.213
35.800.910
37.200.513
39.410.611
41.291.513
49.951.211
53.750.62
58.660.710
63.301.213
63.690.611
63.690.313
64.490.811
65.460.710
65.460.411
70.740.412
  1. 2.326 km SW of La Quinta, California, United States09-27 03:29
  2. 1.626 km SW of La Quinta, California, United States09-27 03:29
  3. 1.623 km SSW of La Quinta, California, United States09-27 03:29
  4. 1.525 km SW of La Quinta, California, United States09-27 18:42
  5. 1.225 km SW of La Quinta, California, United States09-27 03:30
  6. 1.225 km WSW of Oasis, California, United States09-28 03:22
  7. 1.225 km SW of La Quinta, California, United States09-28 16:43
  8. 0.941 km ENE of Valley Center, California, United States09-26 06:57
  9. 0.934 km ENE of Valley Center, California, United States09-27 13:13
  10. 0.826 km SW of Oasis, California, United States09-28 17:54
  11. 0.730 km WSW of Oasis, California, United States09-28 12:04
  12. 0.730 km SW of La Quinta, California, United States09-28 18:52
  13. 0.617 km SW of La Quinta, California, United States09-28 07:10
  14. 0.618 km SW of La Quinta, California, United States09-28 17:06
  15. 0.638 km ENE of San Diego Country Estates, California, United States09-27 16:50
  16. 0.529 km SW of Palm Desert, California, United States09-27 14:37
  17. 0.525 km SW of Rancho Mirage, California, United States09-26 05:06
  18. 0.433 km SW of La Quinta, California, United States09-29 00:09
  19. 0.430 km SW of La Quinta, California, United States09-28 18:53
  20. 0.318 km SSW of La Quinta, California, United States09-28 17:06
  21. 0.341 km SW of La Quinta, California, United States09-26 09:44
  22. 0.235 km ENE of Valley Center, California, United States09-26 17:47
  23. -0.032 km SW of La Quinta, California, United States09-26 13:20

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Reports on SeismoAtlas

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Event id ci41339215. First recorded here 28 Sept 2026, 17:32:09 UTC. Solutions: USGS · CI (usgs:ci41339215). Cite as: SeismoAtlas, “M0.4 earthquake 29 km WSW of Oasis, California, United States”, https://seismoatlas.com/earthquake/ci41339215-m0-4-earthquake-29-km-wsw-of-oasis-california-united-states, data from USGS.

JSON: /api/v1/events/ci41339215. SeismoAtlas is not an official warning service.