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SeismoAtlas

M0.9 earthquake near Moreno Valley, California, United States

A magnitude 0.9 earthquake struck near Moreno Valley, California, United States at 00:40 local time (07:40 UTC) on 18 Oct 2026, at a depth of 12 km, according to USGS.

revised from M1.1

Data: USGS · updated 2026-10-18 13:21 UTC · reviewed

Magnitude
0.9micro
local magnitude (Richter) (ml)
revised from 1.1
Depth
11.8 km
Status
Reviewed
Origin time
2026-10-18 07:40:15 UTC
Local: 18 Oct 2026, 00:40:15 (America/Los Angeles)
Epicentre
33.956° N, 117.211° 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
Moreno ValleyCalifornia, United States · pop. 204,1983 kmINot felt
Loma LindaCalifornia, United States · pop. 24,04511 kmINot felt
RedlandsCalifornia, United States · pop. 71,03512 kmINot felt
ColtonCalifornia, United States · pop. 54,62116 kmINot felt
RiversideCalifornia, United States · pop. 317,26117 kmINot felt
IrvineCalifornia, United States · pop. 256,92765 kmINot felt
Santa AnaCalifornia, United States · pop. 310,22765 kmINot felt
AnaheimCalifornia, United States · pop. 350,74266 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 1.111.8 km33.96° 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 338 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 1.4× the energy of M0.9, and its waves are about 1.3× taller on a seismogram. Energy: 477 g of TNT vs 338 g of TNT.

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

Aftershocks and nearby activity

154 later earthquakes within 30 km; the largest was M2.4 24 days ago. 23 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M0.9

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.520.712
11.991.615
15.920.916
22.942.416
31.731.317
31.791.317
48.031.411
59.681.014
59.721.06
59.941.1-1
68.691.117
81.661.015
83.581.12
95.580.94
96.051.04
96.451.34
97.920.95
98.190.95
98.851.213
105.951.114
108.471.10
109.901.113
117.281.84
117.310.96
118.171.05
118.171.55
118.980.715
120.731.34
121.932.07
121.961.67
121.971.37
122.940.87
130.921.3-1
147.311.04
149.700.99
157.431.13
158.960.71
159.480.89
162.111.613
168.440.811
168.780.76
172.840.611
191.500.612
197.621.67
198.020.68
200.001.06
205.061.02
205.381.4-1
208.880.813
208.881.011
210.880.77
212.110.92
215.181.012
228.380.90
248.741.14
248.981.26
249.781.34
249.840.85
251.431.15
251.981.15
252.021.85
252.151.14
254.750.85
255.061.07
255.071.34
255.272.05
255.581.0-1
255.761.33
258.620.614
258.690.94
258.901.14
259.510.84
261.040.83
274.841.40
277.550.94
282.402.24
282.540.94
283.592.26
283.601.37
283.611.04
283.630.94
284.020.94
284.021.23
285.301.36
285.311.87
286.040.65
286.310.73
286.400.68
287.360.54
287.700.96
287.701.06
287.710.74
288.700.84
288.941.24
289.080.93
289.300.75
289.310.75
289.340.54
289.750.96
289.761.65
289.811.06
290.900.85
292.640.74
292.641.14
296.961.010
299.360.90
300.470.97
303.591.04
312.580.613
313.211.09
316.860.76
317.171.25
317.200.95
317.361.08
322.002.16
329.961.04
331.210.65
339.350.316
340.290.75
374.151.113
382.882.014
382.990.612
396.071.514
406.780.413
406.790.916
407.140.713
407.190.714
413.110.817
421.841.10
431.650.716
438.380.99
443.861.80
452.650.514
455.540.617
456.591.04
468.661.2-1
470.031.40
470.121.316
470.301.60
477.371.513
479.341.017
480.171.016
481.701.16
481.720.915
519.830.917
543.131.417
544.241.55
553.771.18
554.580.99
563.981.08
596.990.917
598.700.414
606.701.69
613.640.91
  1. 2.4Near Loma Linda, California, United States10-19 06:36
  2. 2.2Near Loma Linda, California, United States10-30 02:04
  3. 2.2Near Loma Linda, California, United States10-30 03:15
  4. 2.1Near Loma Linda, California, United States10-31 17:40
  5. 2.04 km WNW of Fontana, California, United States10-23 09:35
  6. 2.07 km WSW of Calimesa, California, United States11-03 06:33
  7. 2.0Near Loma Linda, California, United States10-28 22:56
  8. 1.8Near Loma Linda, California, United States10-28 19:41
  9. 1.8Near Loma Linda, California, United States10-30 04:58
  10. 1.85 km ESE of Loma Linda, California, United States10-23 04:57
  11. 1.8Near El Cerrito Corona, California, United States11-05 19:31
  12. 1.64 km W of Fontana, California, United States10-26 13:17
  13. 1.6Near Loma Linda, California, United States10-30 09:25
  14. 1.64 km ESE of El Cerrito Corona, California, United States11-06 21:57
  15. 1.64 km WNW of Fontana, California, United States10-23 09:37
  16. 1.64 km N of Jurupa Valley, California, United States11-12 14:22
  17. 1.6Near Loma Linda, California, United States10-18 19:39
  18. 1.65 km SE of Mentone, California, United States10-25 01:46
  19. 1.56 km NNE of Cherry Valley, California, United States11-09 23:54
  20. 1.54 km ESE of Cherry Valley, California, United States11-03 19:44
  21. 1.5Near Loma Linda, California, United States11-07 05:02
  22. 1.55 km ESE of Loma Linda, California, United States10-23 05:50
  23. 1.4Near El Cerrito Corona, California, United States10-29 18:30
  24. 1.4Near Beaumont, California, United States11-09 22:48
  25. 1.43 km ENE of El Cerrito Corona, California, United States10-26 21:03

Did you feel it?

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Reports on SeismoAtlas

No reports yet.

Event id ci41348855. First recorded here 18 Oct 2026, 07:43:29 UTC. Solutions: USGS · CI (usgs:ci41348855). Cite as: SeismoAtlas, “M0.9 earthquake near Moreno Valley, California, United States”, https://seismoatlas.com/earthquake/ci41348855-m0-9-earthquake-near-moreno-valley-california-united-states, data from USGS.

JSON: /api/v1/events/ci41348855. SeismoAtlas is not an official warning service.