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M0.9 earthquake 4 km SW of Redlands, California, United States

A magnitude 0.9 earthquake struck 4 km SW of Redlands, California, United States at 05:52 local time (12:52 UTC) on 31 Oct 2026, at a depth of 5 km, according to USGS.

revised from M1.4

Data: USGS · updated 2026-11-02 15:56 UTC · reviewed

Magnitude
0.9micro
local magnitude (Richter) (ml)
revised from 1.4
Depth
4.7 km
Status
Reviewed
Origin time
2026-10-31 12:52:24 UTC
Local: 31 Oct 2026, 05:52:24 (America/Los Angeles)
Epicentre
34.031° 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 kmINot felt
Loma LindaCalifornia, United States · pop. 24,0455 kmINot felt
ColtonCalifornia, United States · pop. 54,62110 kmINot felt
Moreno ValleyCalifornia, United States · pop. 204,19810 kmINot felt
RiversideCalifornia, United States · pop. 317,26120 kmINot felt
AnaheimCalifornia, United States · pop. 350,74268 kmINot felt
Santa AnaCalifornia, United States · pop. 310,22769 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, which has been reviewed by an analyst.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · CIheadlineSouthern California Seismic Network via U.S. Geological Survey0.9 mlwas 1.44.7 km34.03° N, 117.21° W–Reviewed · 2 revisions

How big was it?

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

It released roughly the energy of 349 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 5 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 1.4× the energy of M0.9, and its waves are about 1.2× taller on a seismogram. Energy: 477 g of TNT vs 349 g of TNT.

Each square is the energy of one M0.9. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

37 later earthquakes within 30 km; the largest was M2.1 12 days ago. 76 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M0.9

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.161.08
4.792.16
12.751.04
14.010.65
22.150.316
23.090.75
56.941.113
65.682.014
65.790.612
78.871.514
89.580.413
89.580.916
89.940.713
89.990.714
95.910.817
114.450.716
121.170.99
138.340.617
139.381.04
152.921.316
160.171.513
162.141.017
162.971.016
164.501.16
164.520.915
202.620.917
208.000.87
225.931.417
227.031.55
234.221.113
236.571.18
237.380.99
246.781.08
253.040.93
279.790.917
281.490.414
289.491.69
  1. 2.1Near Loma Linda, California, United States10-31 17:40
  2. 2.07 km WSW of Calimesa, California, United States11-03 06:33
  3. 1.64 km N of Jurupa Valley, California, United States11-12 14:22
  4. 1.56 km NNE of Cherry Valley, California, United States11-09 23:54
  5. 1.54 km ESE of Cherry Valley, California, United States11-03 19:44
  6. 1.5Near Loma Linda, California, United States11-07 05:02
  7. 1.4Near Beaumont, California, United States11-09 22:48
  8. 1.36 km SSW of Redlands, California, United States11-06 21:47
  9. 1.111 km NW of Muscoy, California, United States11-10 07:05
  10. 1.1Near Loma Linda, California, United States11-07 09:22
  11. 1.1Near Cherry Valley, California, United States11-10 09:26
  12. 1.13 km NNW of Cherry Valley, California, United States11-02 21:48
  13. 1.0Near Cherry Valley, California, United States10-31 13:02
  14. 1.04 km SW of Redlands, California, United States11-06 08:15
  15. 1.0Near Loma Linda, California, United States11-01 01:37
  16. 1.05 km NNW of Fontana, California, United States11-10 19:39
  17. 1.0Near Loma Linda, California, United States11-07 07:50
  18. 1.0Near Loma Linda, California, United States11-07 07:00
  19. 0.99 km NE of Nuevo, California, United States11-08 23:29
  20. 0.9Near San Bernardino, California, United States11-07 09:23
  21. 0.9Near Cherry Valley, California, United States11-05 14:02
  22. 0.9Near Beaumont, California, United States11-04 06:27
  23. 0.911 km E of Lake Arrowhead, California, United States11-11 01:54
  24. 0.9Near Cherry Valley, California, United States11-10 10:14
  25. 0.95 km E of Cherry Valley, California, United States11-12 04:39

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Reports on SeismoAtlas

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Event id ci41570360. First recorded here 31 Oct 2026, 12:55:18 UTC. Solutions: USGS · CI (usgs:ci41570360). Cite as: SeismoAtlas, “M0.9 earthquake 4 km SW of Redlands, California, United States”, https://seismoatlas.com/earthquake/ci41570360-m0-9-earthquake-4-km-sw-of-redlands-california-united-states, data from USGS.

JSON: /api/v1/events/ci41570360. SeismoAtlas is not an official warning service.