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SeismoAtlas

M1.0 earthquake 8 km ENE of Moreno Valley, California, United States

A magnitude 1.0 earthquake struck 8 km ENE of Moreno Valley, California, United States at 12:21 local time (19:21 UTC) on 20 Oct 2026, at a depth of 14 km, according to USGS.

revised from M1.2

Data: USGS · updated 2026-10-20 21:33 UTC · reviewed

Magnitude
1.0micro
local magnitude (Richter) (ml)
revised from 1.2
Depth
13.9 km
Status
Reviewed
Origin time
2026-10-20 19:21:19 UTC
Local: 20 Oct 2026, 12:21:19 (America/Los Angeles)
Epicentre
33.958° N, 117.145° 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. 204,1988 kmINot felt
CalimesaCalifornia, United States · pop. 8,5429 kmINot felt
RedlandsCalifornia, United States · pop. 71,03512 kmINot felt
YucaipaCalifornia, United States · pop. 53,32813 kmINot felt
Loma LindaCalifornia, United States · pop. 24,04515 kmINot felt
RiversideCalifornia, United States · pop. 317,26124 kmINot felt
IrvineCalifornia, United States · pop. 256,92770 kmINot felt
Santa AnaCalifornia, United States · pop. 310,22771 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 Survey1.0 mlwas 1.013.9 km33.96° N, 117.14° 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 511 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 14 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 1.1× the energy of M1.0, and its waves are about 1× taller on a seismogram. Energy: 511 g 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

127 later earthquakes within 30 km; the largest was M2.2 14 days ago. 23 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.0

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
9.011.117
21.981.015
35.900.94
36.361.04
36.771.34
38.230.95
38.500.95
39.171.213
46.261.114
46.260.89
50.221.113
57.601.84
57.620.96
58.481.05
58.481.55
59.290.715
61.051.34
86.031.16
87.621.04
90.010.99
97.751.13
99.280.71
102.421.613
108.750.811
109.090.76
113.160.611
129.090.417
131.810.612
135.770.512
138.330.68
145.371.02
149.190.813
149.191.011
152.420.92
155.491.012
189.061.14
189.291.26
190.091.34
190.150.85
190.781.010
191.751.15
192.301.15
192.341.85
192.461.14
195.060.85
195.371.07
195.391.34
195.592.05
196.071.33
198.930.614
199.000.94
199.211.14
199.830.84
201.360.83
217.870.94
222.722.24
222.850.94
223.912.26
223.911.37
223.921.04
223.950.94
224.330.94
224.331.23
225.621.36
225.621.87
226.360.65
226.620.73
226.720.68
227.680.54
228.020.96
228.021.06
228.030.74
229.010.84
229.251.24
229.400.93
229.620.75
229.630.75
229.660.54
230.060.96
230.081.65
230.121.06
231.220.85
232.950.74
232.961.14
240.780.97
243.901.04
252.900.613
257.180.76
257.491.25
257.520.95
257.681.08
262.312.16
269.361.117
270.271.04
271.530.65
279.670.316
280.610.75
302.690.69
305.471.713
314.461.113
323.202.014
323.310.612
336.391.514
347.090.413
347.100.916
347.460.713
347.510.714
353.430.817
371.960.716
378.690.99
392.960.514
395.860.617
396.901.04
410.441.316
417.691.513
419.661.017
420.481.016
422.021.16
422.040.915
447.920.520
460.140.917
483.451.417
484.551.55
494.091.18
494.890.99
537.310.917
539.010.414
  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. 2.0Near Loma Linda, California, United States10-28 22:56
  6. 1.8Near Loma Linda, California, United States10-28 19:41
  7. 1.8Near Loma Linda, California, United States10-30 04:58
  8. 1.85 km ESE of Loma Linda, California, United States10-23 04:57
  9. 1.76 km ENE of San Jacinto, California, United States11-02 12:49
  10. 1.6Near Loma Linda, California, United States10-30 09:25
  11. 1.65 km SE of Mentone, California, United States10-25 01:46
  12. 1.56 km NNE of Cherry Valley, California, United States11-09 23:54
  13. 1.54 km ESE of Cherry Valley, California, United States11-03 19:44
  14. 1.5Near Loma Linda, California, United States11-07 05:02
  15. 1.55 km ESE of Loma Linda, California, United States10-23 05:50
  16. 1.4Near Beaumont, California, United States11-09 22:48
  17. 1.34 km SW of Redlands, California, United States10-28 23:25
  18. 1.35 km SW of Redlands, California, United States10-28 22:44
  19. 1.35 km SW of Redlands, California, United States10-23 08:24
  20. 1.36 km SSW of Redlands, California, United States11-06 21:47
  21. 1.3Near Loma Linda, California, United States10-30 03:16
  22. 1.3Near Loma Linda, California, United States10-30 04:58
  23. 1.34 km SW of Redlands, California, United States10-28 17:26
  24. 1.35 km ESE of Loma Linda, California, United States10-22 08:07
  25. 1.2Near Loma Linda, California, United States10-30 03:41

Did you feel it?

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Reports on SeismoAtlas

No reports yet.

Event id ci41349823. First recorded here 20 Oct 2026, 19:24:02 UTC. Solutions: USGS · CI (usgs:ci41349823). Cite as: SeismoAtlas, “M1.0 earthquake 8 km ENE of Moreno Valley, California, United States”, https://seismoatlas.com/earthquake/ci41349823-m1-0-earthquake-8-km-ene-of-moreno-valley-california-united-states, data from USGS.

JSON: /api/v1/events/ci41349823. SeismoAtlas is not an official warning service.