Skip to content
SeismoAtlas

M1.2 earthquake 7 km NW of Muscoy, California, United States

A magnitude 1.2 earthquake struck 7 km NW of Muscoy, California, United States at 18:37 local time (01:37 UTC) on 27 Oct 2026, at a depth of 13 km, according to USGS.

Data: USGS · updated 2026-10-29 17:13 UTC · reviewed

Magnitude
1.2micro
local magnitude (Richter) (ml)
Depth
13.4 km
Status
Reviewed
Origin time
2026-10-28 01:37:54 UTC
Local: 27 Oct 2026, 18:37:54 (America/Los Angeles)
Epicentre
34.191° N, 117.394° 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. 10,6447 kmINot felt
RialtoCalifornia, United States · pop. 103,1329 kmINot felt
FontanaCalifornia, United States · pop. 212,70412 kmINot felt
San BernardinoCalifornia, United States · pop. 216,10813 kmINot felt
BloomingtonCalifornia, United States · pop. 23,85114 kmINot felt
RiversideCalifornia, United States · pop. 317,26127 kmINot felt
AnaheimCalifornia, United States · pop. 350,74262 kmINot felt
Santa AnaCalifornia, United States · pop. 310,22766 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 Survey1.2 mlwas 1.213.4 km34.19° N, 117.39° 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 888 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.

M1.2 releases about 1.9× the energy of M1.0, and its waves are about 1.5× taller on a seismogram. Energy: 888 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

88 later earthquakes within 30 km; the largest was M2.2 13 days ago. 39 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.2

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
14.781.14
15.021.26
15.821.34
15.870.85
17.471.15
18.021.15
18.061.85
18.191.14
20.790.85
21.101.07
21.111.34
21.312.05
21.801.33
24.660.614
24.720.94
24.931.14
25.550.84
27.080.83
43.590.94
48.442.24
48.580.94
48.811.37
49.632.26
49.641.37
49.651.04
49.670.94
50.050.94
50.061.23
51.341.36
51.351.87
52.080.65
52.350.73
52.440.68
53.400.54
53.740.96
53.741.06
53.750.74
54.730.84
54.981.24
55.120.93
55.340.75
55.350.75
55.380.54
55.790.96
55.801.65
55.851.06
56.940.85
58.670.74
58.681.14
63.001.010
66.510.97
69.631.04
72.140.94
72.351.14
79.251.09
82.900.76
83.211.25
83.240.95
88.042.16
92.451.111
96.001.04
97.250.65
105.390.316
106.330.75
119.931.19
173.180.713
173.230.714
182.301.24
197.690.716
217.130.914
217.140.413
221.580.617
222.631.04
222.981.113
229.420.97
236.161.316
243.411.513
245.381.017
246.211.016
247.741.16
247.760.915
278.001.011
291.240.87
317.471.113
330.021.08
336.280.93
362.961.110
372.741.69
  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. 2.0Near Loma Linda, California, United States10-28 22:56
  5. 1.8Near Loma Linda, California, United States10-28 19:41
  6. 1.8Near Loma Linda, California, United States10-30 04:58
  7. 1.6Near Loma Linda, California, United States10-30 09:25
  8. 1.64 km N of Jurupa Valley, California, United States11-12 14:22
  9. 1.5Near Loma Linda, California, United States11-07 05:02
  10. 1.34 km SW of Redlands, California, United States10-28 23:25
  11. 1.35 km SW of Redlands, California, United States10-28 22:44
  12. 1.37 km NNW of Eastvale, California, United States10-30 02:26
  13. 1.36 km SSW of Redlands, California, United States11-06 21:47
  14. 1.3Near Loma Linda, California, United States10-30 03:16
  15. 1.3Near Loma Linda, California, United States10-30 04:58
  16. 1.34 km SW of Redlands, California, United States10-28 17:26
  17. 1.2Near Loma Linda, California, United States10-30 03:41
  18. 1.2Near Loma Linda, California, United States10-31 12:50
  19. 1.26 km WNW of Jurupa Valley, California, United States11-04 15:55
  20. 1.24 km SW of Redlands, California, United States10-28 16:38
  21. 1.2Near Loma Linda, California, United States10-30 08:36
  22. 1.1Near Loma Linda, California, United States10-29 02:34
  23. 1.111 km NW of Muscoy, California, United States11-10 07:05
  24. 1.14 km SW of Redlands, California, United States10-28 19:39
  25. 1.1Near Rancho Cucamonga, California, United States10-31 22:04

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 ci41567976. First recorded here 28 Oct 2026, 01:41:29 UTC. Solutions: USGS · CI (usgs:ci41567976). Cite as: SeismoAtlas, “M1.2 earthquake 7 km NW of Muscoy, California, United States”, https://seismoatlas.com/earthquake/ci41567976-m1-2-earthquake-7-km-nw-of-muscoy-california-united-states, data from USGS.

JSON: /api/v1/events/ci41567976. SeismoAtlas is not an official warning service.