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M0.9 earthquake 16 km NE of Valley Center, California, United States

A magnitude 0.9 earthquake struck 16 km NE of Valley Center, California, United States at 03:17 local time (10:17 UTC) on 27 Oct 2026, at a depth of 16 km, according to USGS.

revised from M1.1

Data: USGS · updated 2026-10-27 15:29 UTC · reviewed

Magnitude
0.9micro
local magnitude (Richter) (ml)
revised from 1.1
Depth
15.6 km
Status
Reviewed
Origin time
2026-10-27 10:17:23 UTC
Local: 27 Oct 2026, 03:17:23 (America/Los Angeles)
Epicentre
33.340° N, 116.930° 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
Valley CenterCalifornia, United States · pop. 9,27716 kmINot felt
TemeculaCalifornia, United States · pop. 110,00326 kmINot felt
EscondidoCalifornia, United States · pop. 151,03829 kmINot felt
FallbrookCalifornia, United States · pop. 30,53430 kmINot felt
San MarcosCalifornia, United States · pop. 92,93131 kmINot felt
San DiegoCalifornia, United States · pop. 1,404,45272 kmINot felt
Chula VistaCalifornia, United States · pop. 265,75779 kmINot felt
RiversideCalifornia, United States · pop. 317,26181 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 mlwas 1.115.6 km33.34° N, 116.93° 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 338 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 16 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 1.3× taller on a seismogram. Energy: 477 g of TNT vs 338 g of TNT.

Each square is the energy of one M0.9. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

56 later earthquakes within 30 km; the largest was M2.6 6 days ago. 36 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M0.9

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
1.151.16
36.681.18
48.030.96
54.170.66
56.700.66
58.010.14
73.290.76
92.68-0.17
103.10-0.25
109.440.44
142.920.76
143.401.211
144.00-0.06
153.931.110
160.980.612
162.560.16
165.180.06
170.940.16
192.500.89
194.470.46
199.970.36
209.680.613
214.880.57
217.590.54
225.660.85
227.270.76
232.151.06
234.130.66
236.452.67
236.471.17
238.920.27
240.470.411
240.821.37
241.600.37
245.480.66
247.660.47
254.13-0.17
275.740.27
281.080.74
282.520.46
282.520.16
283.470.56
308.310.66
319.831.06
321.650.813
333.770.94
338.940.27
345.020.411
347.101.317
352.970.710
355.330.35
368.760.44
380.080.412
381.251.56
387.460.54
390.700.44
  1. 2.641 km ENE of Valley Center, California, United States11-06 06:44
  2. 1.541 km ENE of Valley Center, California, United States11-12 07:32
  3. 1.316 km NNE of Ramona, California, United States11-10 21:23
  4. 1.341 km ENE of Valley Center, California, United States11-06 11:06
  5. 1.218 km ENE of Temecula, California, United States11-02 09:41
  6. 1.129 km SE of Valle Vista, California, United States10-27 11:26
  7. 1.130 km SSE of Valle Vista, California, United States11-02 20:13
  8. 1.141 km SW of La Quinta, California, United States11-06 06:45
  9. 1.123 km NNE of Ramona, California, United States10-28 22:58
  10. 1.029 km SE of Valle Vista, California, United States11-09 18:07
  11. 1.029 km SE of Valle Vista, California, United States11-06 02:26
  12. 0.929 km SE of Valle Vista, California, United States10-29 10:19
  13. 0.929 km SSE of Valle Vista, California, United States11-10 08:03
  14. 0.829 km SE of Valle Vista, California, United States11-05 19:57
  15. 0.823 km NNE of San Diego Country Estates, California, United States11-04 10:47
  16. 0.835 km ENE of Valley Center, California, United States11-09 19:56
  17. 0.723 km NNE of Ramona, California, United States11-11 03:15
  18. 0.730 km SSE of Valle Vista, California, United States11-08 03:22
  19. 0.729 km SE of Valle Vista, California, United States10-30 11:35
  20. 0.722 km SSE of Valle Vista, California, United States11-02 09:12
  21. 0.729 km SE of Valle Vista, California, United States11-05 21:33
  22. 0.629 km SE of Valle Vista, California, United States10-29 18:59
  23. 0.629 km SE of Valle Vista, California, United States11-06 04:25
  24. 0.623 km NNE of Ramona, California, United States11-05 03:58
  25. 0.629 km SE of Valle Vista, California, United States11-09 06:35

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 ci41353447. First recorded here 27 Oct 2026, 10:19:51 UTC. Solutions: USGS · CI (usgs:ci41353447). Cite as: SeismoAtlas, “M0.9 earthquake 16 km NE of Valley Center, California, United States”, https://seismoatlas.com/earthquake/ci41353447-m0-9-earthquake-16-km-ne-of-valley-center-california-united-states, data from USGS.

JSON: /api/v1/events/ci41353447. SeismoAtlas is not an official warning service.