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SeismoAtlas

M1.0 earthquake 7 km ENE of Muscoy, California, United States

A magnitude 1.0 earthquake struck 7 km ENE of Muscoy, California, United States at 13:43 local time (20:43 UTC) on 26 Oct 2026, at a depth of 2 km, according to USGS.

revised from M1.1

Data: USGS · updated 2026-10-27 19:17 UTC · reviewed

Magnitude
1.0micro
local magnitude (Richter) (ml)
revised from 1.1
Depth
2 km
Status
Reviewed
Origin time
2026-10-26 20:43:44 UTC
Local: 26 Oct 2026, 13:43:44 (America/Los Angeles)
Epicentre
34.174° N, 117.275° 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
San BernardinoCalifornia, United States · pop. 216,1087 kmINot felt
HighlandCalifornia, United States · pop. 54,8548 kmINot felt
RialtoCalifornia, United States · pop. 103,13211 kmINot felt
ColtonCalifornia, United States · pop. 54,62112 kmINot felt
RiversideCalifornia, United States · pop. 317,26127 kmINot felt
AnaheimCalifornia, United States · pop. 350,74269 kmINot felt
Santa AnaCalifornia, United States · pop. 310,22772 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. Likely felt out to about 1 km.

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 1.12 km34.17° N, 117.28° 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 529 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 2 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 1.1× taller on a seismogram. Energy: 529 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

96 later earthquakes within 30 km; the largest was M2.2 13 days ago. 37 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.0

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
2.450.97
3.820.813
3.821.011
5.830.77
7.050.92
10.121.012
28.901.213
38.930.36
43.681.14
43.921.26
44.721.34
44.780.85
46.381.15
46.921.15
46.961.85
47.091.14
49.690.85
50.001.07
50.011.34
50.222.05
50.701.33
53.560.614
53.630.94
53.841.14
54.450.84
55.980.83
72.490.94
77.342.24
77.480.94
78.532.26
78.541.37
78.551.04
78.570.94
78.960.94
78.961.23
80.251.36
80.251.87
80.980.65
81.250.73
81.350.68
82.310.54
82.640.96
82.651.06
82.650.74
83.640.84
83.881.24
84.020.93
84.240.75
84.250.75
84.290.54
84.690.96
84.701.65
84.751.06
85.840.85
87.580.74
87.581.14
91.901.010
95.410.97
98.531.04
101.040.94
101.251.14
107.530.613
108.161.09
111.810.76
112.121.25
112.140.95
116.942.16
121.351.111
124.901.04
126.150.65
134.300.316
135.230.75
148.831.19
177.822.014
177.930.612
202.090.713
202.130.714
226.590.716
246.030.914
246.040.413
250.480.617
251.531.04
258.320.97
265.071.316
272.321.513
274.291.017
275.111.016
276.641.16
276.670.915
306.911.011
320.150.87
346.371.113
358.921.08
365.180.93
391.871.110
401.641.69
  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. 2.07 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. 1.6Near Loma Linda, California, United States10-30 09:25
  9. 1.64 km N of Jurupa Valley, California, United States11-12 14:22
  10. 1.5Near Loma Linda, California, United States11-07 05:02
  11. 1.34 km SW of Redlands, California, United States10-28 23:25
  12. 1.35 km SW of Redlands, California, United States10-28 22:44
  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. 1.27 km NW of Muscoy, California, United States10-28 01:37
  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 ci41353167. First recorded here 26 Oct 2026, 20:47:15 UTC. Solutions: USGS · CI (usgs:ci41353167). Cite as: SeismoAtlas, “M1.0 earthquake 7 km ENE of Muscoy, California, United States”, https://seismoatlas.com/earthquake/ci41353167-m1-0-earthquake-7-km-ene-of-muscoy-california-united-states, data from USGS.

JSON: /api/v1/events/ci41353167. SeismoAtlas is not an official warning service.