Skip to content
SeismoAtlas

M1.0 earthquake 4 km NW of Muscoy, California, United States

A magnitude 1.0 earthquake struck 4 km NW of Muscoy, California, United States at 09:37 local time (16:37 UTC) on 30 Oct 2026, at a depth of 10 km, according to USGS. The solution is preliminary and may be revised.

revised from M1.1

Data: USGS · updated 2026-10-30 16:41 UTC · automatic solution

Magnitude
1.0micro
local magnitude (Richter) (ml)
revised from 1.1
Depth
10.4 km
Status
Automatic
Origin time
2026-10-30 16:37:57 UTC
Local: 30 Oct 2026, 09:37:57 (America/Los Angeles)
Epicentre
34.175° N, 117.373° 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. 10,6444 kmINot felt
RialtoCalifornia, United States · pop. 103,1327 kmINot felt
San BernardinoCalifornia, United States · pop. 216,10810 kmINot felt
FontanaCalifornia, United States · pop. 212,70411 kmINot felt
BloomingtonCalifornia, United States · pop. 23,85112 kmINot felt
RiversideCalifornia, United States · pop. 317,26125 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.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · CIheadlineSouthern California Seismic Network via U.S. Geological Survey1.0 mlwas 1.110.4 km34.17° N, 117.37° W–Automatic · 1 revision

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 10 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

38 later earthquakes within 30 km; the largest was M2.1 12 days ago. 70 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.0

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
3.510.97
6.631.04
9.140.94
9.341.14
16.251.09
19.900.76
20.211.25
20.240.95
25.032.16
29.451.111
33.001.04
34.250.65
42.390.316
43.330.75
56.931.19
110.180.713
110.230.714
119.301.24
134.690.716
154.130.914
154.140.413
158.580.617
159.631.04
159.981.113
166.420.97
173.161.316
180.411.513
182.381.017
183.211.016
184.741.16
184.760.915
215.001.011
228.240.87
254.461.113
267.021.08
273.280.93
299.961.110
309.741.69
  1. 2.1Near Loma Linda, California, United States10-31 17:40
  2. 1.64 km N of Jurupa Valley, California, United States11-12 14:22
  3. 1.5Near Loma Linda, California, United States11-07 05:02
  4. 1.36 km SSW of Redlands, California, United States11-06 21:47
  5. 1.2Near Loma Linda, California, United States10-31 12:50
  6. 1.26 km WNW of Jurupa Valley, California, United States11-04 15:55
  7. 1.111 km NW of Muscoy, California, United States11-10 07:05
  8. 1.1Near Rancho Cucamonga, California, United States10-31 22:04
  9. 1.1Near Loma Linda, California, United States11-07 09:22
  10. 1.110 km N of Rancho Cucamonga, California, United States10-31 01:58
  11. 1.113 km NE of Rancho Cucamonga, California, United States11-02 01:33
  12. 1.114 km WNW of Muscoy, California, United States11-12 04:35
  13. 1.14 km SSW of Rancho Cucamonga, California, United States11-06 08:36
  14. 1.04 km SW of Redlands, California, United States11-06 08:15
  15. 1.05 km ENE of Rancho Cucamonga, California, United States11-08 15:38
  16. 1.04 km N of Jurupa Valley, California, United States10-31 08:53
  17. 1.0Near Loma Linda, California, United States11-01 01:37
  18. 1.0Near Loma Linda, California, United States10-30 23:15
  19. 1.05 km NNW of Fontana, California, United States11-10 19:39
  20. 1.0Near Loma Linda, California, United States11-07 07:50
  21. 1.0Near Loma Linda, California, United States11-07 07:00
  22. 0.9Near Loma Linda, California, United States10-30 20:08
  23. 0.9Near San Bernardino, California, United States11-07 09:23
  24. 0.94 km SW of Redlands, California, United States10-31 12:52
  25. 0.916 km NNE of Rancho Cucamonga, California, United States11-06 02:45

Did you feel it?

Reports from people help show where shaking was strong. They are anonymous and shown here in aggregate.

How strong was the shaking where you were?

Anonymous. No account, no cookies. A short automatic check runs in your browser instead of a third-party captcha.

Reports on SeismoAtlas

No reports yet.

Event id ci41569872. First recorded here 30 Oct 2026, 16:41:09 UTC. Solutions: USGS · CI (usgs:ci41569872). Cite as: SeismoAtlas, “M1.0 earthquake 4 km NW of Muscoy, California, United States”, https://seismoatlas.com/earthquake/ci41569872-m1-0-earthquake-4-km-nw-of-muscoy-california-united-states, data from USGS.

JSON: /api/v1/events/ci41569872. SeismoAtlas is not an official warning service.