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M1.3 earthquake 4 km SW of Redlands, California, United States

A magnitude 1.3 earthquake struck 4 km SW of Redlands, California, United States at 16:25 local time (23:25 UTC) on 28 Oct 2026, at a depth of 3 km, according to USGS. The solution is preliminary and may be revised.

revised from M1.6

Data: USGS · updated 2026-10-28 23:36 UTC · automatic solution

Magnitude
1.3micro
local magnitude (Richter) (ml)
revised from 1.6
Depth
3.4 km
Status
Automatic
Origin time
2026-10-28 23:25:46 UTC
Local: 28 Oct 2026, 16:25:46 (America/Los Angeles)
Epicentre
34.029° N, 117.209° 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
RedlandsCalifornia, United States · pop. 71,0354 kmIIWeak
Loma LindaCalifornia, United States · pop. 24,0455 kmINot felt
Moreno ValleyCalifornia, United States · pop. 204,19810 kmINot felt
ColtonCalifornia, United States · pop. 54,62110 kmINot felt
RiversideCalifornia, United States · pop. 317,26120 kmINot felt
AnaheimCalifornia, United States · pop. 350,74268 kmINot felt
Santa AnaCalifornia, United States · pop. 310,22768 kmINot felt
IrvineCalifornia, United States · pop. 256,92769 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.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · CIheadlineSouthern California Seismic Network via U.S. Geological Survey1.3 mlwas 1.63.4 km34.03° N, 117.21° W–Automatic · 1 revision

How big was it?

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

It released roughly the energy of 2 kg 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 3 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M1.3 releases about 3.2× the energy of M1.0, and its waves are about 2.2× taller on a seismogram. Energy: 2 kg of TNT vs 477 g of TNT.

Each square is the energy of one M1.0. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

80 later earthquakes within 30 km; the largest was M2.2 13 days ago. 52 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.3

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
2.860.614
2.930.94
3.141.14
3.750.84
5.280.83
21.790.94
26.642.24
26.780.94
27.832.26
27.841.37
27.851.04
27.870.94
28.260.94
28.261.23
29.551.36
29.551.87
30.280.65
30.550.73
30.640.68
31.610.54
31.940.96
31.951.06
31.950.74
32.940.84
33.181.24
33.320.93
33.540.75
33.550.75
33.590.54
33.990.96
34.001.65
34.051.06
35.140.85
36.880.74
36.881.14
41.201.010
44.710.97
47.831.04
56.830.613
57.451.09
61.110.76
61.411.25
61.440.95
61.601.08
66.242.16
74.201.04
75.450.65
83.600.316
84.530.75
118.391.113
127.122.014
127.230.612
140.311.514
151.020.413
151.030.916
151.390.713
151.430.714
157.360.817
175.890.716
182.620.99
199.780.617
200.831.04
214.371.316
221.621.513
223.581.017
224.411.016
225.941.16
225.970.915
264.070.917
269.450.87
287.371.417
288.481.55
295.671.113
298.011.18
298.820.99
308.221.08
314.480.93
341.230.917
342.940.414
350.941.69
  1. 2.2Near Loma Linda, California, United States10-30 02:04
  2. 2.2Near Loma Linda, California, United States10-30 03:15
  3. 2.1Near Loma Linda, California, United States10-31 17:40
  4. 2.07 km WSW of Calimesa, California, United States11-03 06:33
  5. 1.8Near Loma Linda, California, United States10-30 04:58
  6. 1.6Near Loma Linda, California, United States10-30 09:25
  7. 1.64 km N of Jurupa Valley, California, United States11-12 14:22
  8. 1.56 km NNE of Cherry Valley, California, United States11-09 23:54
  9. 1.54 km ESE of Cherry Valley, California, United States11-03 19:44
  10. 1.5Near Loma Linda, California, United States11-07 05:02
  11. 1.4Near Beaumont, California, United States11-09 22:48
  12. 1.36 km SSW of Redlands, California, United States11-06 21:47
  13. 1.3Near Loma Linda, California, United States10-30 03:16
  14. 1.3Near Loma Linda, California, United States10-30 04:58
  15. 1.2Near Loma Linda, California, United States10-30 03:41
  16. 1.2Near Loma Linda, California, United States10-31 12:50
  17. 1.2Near Loma Linda, California, United States10-30 08:36
  18. 1.1Near Loma Linda, California, United States10-29 02:34
  19. 1.111 km NW of Muscoy, California, United States11-10 07:05
  20. 1.1Near Loma Linda, California, United States11-07 09:22
  21. 1.1Near Cherry Valley, California, United States11-10 09:26
  22. 1.1Near Loma Linda, California, United States10-30 12:18
  23. 1.13 km NNW of Cherry Valley, California, United States11-02 21:48
  24. 1.0Near Cherry Valley, California, United States10-31 13:02
  25. 1.04 km SW of Redlands, California, United States11-06 08:15

Did you feel it?

Reports from people help show where shaking was strong. They are anonymous and shown here in aggregate.

Reports close 14 days after an earthquake.

Reports on SeismoAtlas

No reports yet.

Event id ci41568528. First recorded here 28 Oct 2026, 23:28:24 UTC. Solutions: USGS · CI (usgs:ci41568528). Cite as: SeismoAtlas, “M1.3 earthquake 4 km SW of Redlands, California, United States”, https://seismoatlas.com/earthquake/ci41568528-m1-3-earthquake-4-km-sw-of-redlands-california-united-states, data from USGS.

JSON: /api/v1/events/ci41568528. SeismoAtlas is not an official warning service.