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M0.4 earthquake 22 km SSE of Valle Vista, California, United States

A magnitude 0.4 earthquake struck 22 km SSE of Valle Vista, California, United States at 22:00 local time (05:00 UTC) on 26 Sept 2026, at a depth of 12 km, according to USGS.

Data: USGS · updated 2026-09-28 21:48 UTC · reviewed

Magnitude
0.4micro
local magnitude (Richter) (ml)
Depth
11.9 km
Status
Reviewed
Origin time
2026-09-27 05:00:00 UTC
Local: 26 Sept 2026, 22:00:00 (America/Los Angeles)
Epicentre
33.582° N, 116.758° 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
Valle VistaCalifornia, United States · pop. 14,57822 kmINot felt
East HemetCalifornia, United States · pop. 17,41824 kmINot felt
HemetCalifornia, United States · pop. 83,86127 kmINot felt
San JacintoCalifornia, United States · pop. 46,95129 kmINot felt
Palm SpringsCalifornia, United States · pop. 47,37134 kmINot felt
Cathedral CityCalifornia, United States · pop. 53,82635 kmINot felt
RiversideCalifornia, United States · pop. 317,26172 kmINot felt
IrvineCalifornia, United States · pop. 256,92799 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 mlwas 0.411.9 km33.58° N, 116.76° W–Reviewed · 1 revision

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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 54 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 12 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 8.8× the energy of M0.4, and its waves are about 4.3× taller on a seismogram. Energy: 477 g of TNT vs 54 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 M1.7 21 h ago. 78 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)
0.070.512
2.21-0.06
3.050.718
4.180.814
6.700.26
7.450.617
7.760.93
8.220.910
9.620.513
10.261.413
13.711.513
18.210.56
18.880.86
21.711.712
21.760.913
22.411.114
23.410.213
32.040.411
33.431.117
35.731.213
36.240.716
37.880.710
37.880.411
  1. 1.723 km SSE of Valle Vista, California, United States09-28 02:42
  2. 1.525 km SW of La Quinta, California, United States09-27 18:42
  3. 1.424 km E of Temecula, California, United States09-27 15:15
  4. 1.225 km SW of La Quinta, California, United States09-28 16:43
  5. 1.116 km SE of Valle Vista, California, United States09-28 03:24
  6. 1.120 km ESE of Valle Vista, California, United States09-28 14:25
  7. 0.928 km SSE of Valle Vista, California, United States09-27 12:45
  8. 0.923 km SSE of Valle Vista, California, United States09-28 02:45
  9. 0.934 km ENE of Valley Center, California, United States09-27 13:13
  10. 0.820 km SE of Valle Vista, California, United States09-27 09:10
  11. 0.829 km SE of Valle Vista, California, United States09-27 23:52
  12. 0.713 km ESE of Valle Vista, California, United States09-28 17:14
  13. 0.718 km ESE of Valle Vista, California, United States09-27 08:02
  14. 0.730 km SW of La Quinta, California, United States09-28 18:52
  15. 0.625 km ENE of Valley Center, California, United States09-27 12:26
  16. 0.525 km SE of Valle Vista, California, United States09-27 05:04
  17. 0.529 km SW of Palm Desert, California, United States09-27 14:37
  18. 0.529 km SE of Valle Vista, California, United States09-27 23:12
  19. 0.415 km SE of Valle Vista, California, United States09-28 13:02
  20. 0.430 km SW of La Quinta, California, United States09-28 18:53
  21. 0.229 km SE of Valle Vista, California, United States09-27 11:41
  22. 0.222 km SSE of Valle Vista, California, United States09-28 04:24
  23. -0.021 km SSE of Valle Vista, California, United States09-27 07:12

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Reports on SeismoAtlas

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Event id ci41339703. First recorded here 28 Sept 2026, 17:32:09 UTC. Solutions: USGS · CI (usgs:ci41339703). Cite as: SeismoAtlas, “M0.4 earthquake 22 km SSE of Valle Vista, California, United States”, https://seismoatlas.com/earthquake/ci41339703-m0-4-earthquake-22-km-sse-of-valle-vista-california-united-states, data from USGS.

JSON: /api/v1/events/ci41339703. SeismoAtlas is not an official warning service.