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M0.9 earthquake 13 km NW of Muscoy, California, United States

A magnitude 0.9 earthquake struck 13 km NW of Muscoy, California, United States at 14:50 local time (21:50 UTC) on 30 Sept 2026, at a depth of 13 km, according to USGS.

Data: USGS · updated 2026-10-01 13:11 UTC · reviewed

Magnitude
0.9micro
local magnitude (Richter) (ml)
Depth
13.4 km
Status
Reviewed
Origin time
2026-09-30 21:50:48 UTC
Local: 30 Sept 2026, 14:50:48 (America/Los Angeles)
Epicentre
34.226° N, 117.445° 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
MuscoyCalifornia, United States · pop. 10,64413 kmINot felt
CrestlineCalifornia, United States · pop. 10,77014 kmINot felt
RialtoCalifornia, United States · pop. 103,13215 kmINot felt
FontanaCalifornia, United States · pop. 212,70415 kmINot felt
BloomingtonCalifornia, United States · pop. 23,85118 kmINot felt
Rancho CucamongaCalifornia, United States · pop. 175,23619 kmINot felt
RiversideCalifornia, United States · pop. 317,26131 kmINot felt
AnaheimCalifornia, United States · pop. 350,74261 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 ml13.4 km34.23° N, 117.45° W–Reviewed · 1 revision

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 13 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

135 later earthquakes within 30 km; the largest was M2.7 35 days ago. 12 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M0.9

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
3.411.32
9.841.017
12.432.110
17.471.28
61.140.710
70.021.95
70.021.75
74.160.87
77.450.77
96.121.015
103.571.517
139.711.116
144.331.011
146.842.19
152.870.817
156.061.216
158.800.69
165.921.416
171.800.96
172.561.57
172.781.16
176.070.96
177.920.916
178.010.97
178.301.47
178.302.76
178.571.16
180.191.07
180.401.27
180.740.77
180.820.87
180.820.97
180.971.27
181.960.47
182.011.05
182.570.67
184.651.16
185.550.76
185.971.816
186.620.55
186.660.97
186.820.87
199.581.217
202.540.75
204.520.87
205.381.78
215.971.75
232.290.914
236.001.516
245.571.014
249.401.115
269.261.13
279.070.918
280.920.914
290.221.54
290.460.415
330.661.04
348.711.03
386.041.56
412.941.04
429.811.615
433.750.916
440.762.416
449.551.317
449.611.317
477.541.06
484.710.77
499.491.015
510.271.37
516.010.95
531.761.710
534.220.53
535.130.96
535.991.05
539.752.07
539.781.67
539.791.37
540.760.87
562.830.95
575.261.13
576.780.71
577.300.89
580.800.78
594.431.48
605.631.012
609.320.612
615.441.67
617.821.06
622.881.02
625.330.97
626.700.813
626.701.011
628.710.77
633.001.012
651.791.213
667.660.85
669.851.85
672.570.85
673.102.05
676.440.614
676.510.94
676.721.14
677.340.84
695.370.94
700.232.24
700.360.94
700.591.37
701.412.26
701.421.37
701.431.04
701.450.94
701.840.94
701.841.23
703.131.36
703.131.87
703.860.65
704.130.73
704.230.68
705.190.54
705.530.96
705.531.06
705.540.74
706.520.84
706.761.24
706.910.93
707.120.75
707.140.75
707.170.54
707.570.96
707.581.65
707.631.06
708.730.85
710.471.14
714.791.010
718.290.97
  1. 2.74 km WNW of Fontana, California, United States10-08 08:09
  2. 2.4Near Loma Linda, California, United States10-19 06:36
  3. 2.2Near Loma Linda, California, United States10-30 02:04
  4. 2.2Near Loma Linda, California, United States10-30 03:15
  5. 2.15 km NNW of Fontana, California, United States10-07 00:41
  6. 2.112 km NW of Muscoy, California, United States10-01 10:16
  7. 2.04 km WNW of Fontana, California, United States10-23 09:35
  8. 2.0Near Loma Linda, California, United States10-28 22:56
  9. 1.97 km NNW of Eastvale, California, United States10-03 19:52
  10. 1.8Near Loma Linda, California, United States10-28 19:41
  11. 1.8Near Loma Linda, California, United States10-30 04:58
  12. 1.8Near Colton, California, United States10-08 15:49
  13. 1.76 km WNW of Jurupa Valley, California, United States10-03 19:52
  14. 1.77 km WNW of Jurupa Valley, California, United States10-09 21:48
  15. 1.75 km SSW of Piñon Hills, California, United States10-23 01:36
  16. 1.714 km NNE of Rancho Cucamonga, California, United States10-09 11:13
  17. 1.64 km W of Fontana, California, United States10-26 13:17
  18. 1.6Near Loma Linda, California, United States10-30 09:25
  19. 1.64 km WNW of Fontana, California, United States10-23 09:37
  20. 1.6Near Loma Linda, California, United States10-18 19:39
  21. 1.5Near Colton, California, United States10-10 17:50
  22. 1.514 km WNW of Muscoy, California, United States10-16 23:53
  23. 1.5Near Fontana, California, United States10-13 00:04
  24. 1.5Near Loma Linda, California, United States10-05 05:24
  25. 1.54 km WNW of Fontana, California, United States10-08 02:24

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 ci41341231. First recorded here 30 Sept 2026, 21:55:02 UTC. Solutions: USGS · CI (usgs:ci41341231). Cite as: SeismoAtlas, “M0.9 earthquake 13 km NW of Muscoy, California, United States”, https://seismoatlas.com/earthquake/ci41341231-m0-9-earthquake-13-km-nw-of-muscoy-california-united-states, data from USGS.

JSON: /api/v1/events/ci41341231. SeismoAtlas is not an official warning service.