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M0.9 earthquake 26 km NNE of San Diego Country Estates, California, United States

A magnitude 0.9 earthquake struck 26 km NNE of San Diego Country Estates, California, United States at 10:54 local time (17:54 UTC) on 27 Oct 2026, at a depth of 8 km, according to USGS.

revised from M1.0

Data: USGS · updated 2026-10-27 19:42 UTC · reviewed

Magnitude
0.9micro
local magnitude (Richter) (ml)
revised from 1.0
Depth
7.8 km
Status
Reviewed
Origin time
2026-10-27 17:54:27 UTC
Local: 27 Oct 2026, 10:54:27 (America/Los Angeles)
Epicentre
33.214° N, 116.642° 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
San Diego Country EstatesCalifornia, United States · pop. 10,10926 kmINot felt
RamonaCalifornia, United States · pop. 20,29229 kmINot felt
EscondidoCalifornia, United States · pop. 151,03843 kmINot felt
PowayCalifornia, United States · pop. 50,15747 kmINot felt
LakesideCalifornia, United States · pop. 20,64847 kmINot felt
San DiegoCalifornia, United States · pop. 1,404,45273 kmINot felt
Chula VistaCalifornia, United States · pop. 265,75776 kmINot felt
TijuanaBaja California, Mexico · pop. 1,922,52386 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 0.87.8 km33.21° N, 116.64° W–Reviewed · 3 revisions

How big was it?

Usually not felt. Recorded by nearby seismometers; thousands occur worldwide every day.

It released roughly the energy of 315 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 8 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 1.5× the energy of M0.9, and its waves are about 1.3× taller on a seismogram. Energy: 477 g of TNT vs 315 g of TNT.

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

Aftershocks and nearby activity

64 later earthquakes within 30 km; the largest was M2.6 6 days ago. 29 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M0.9

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
3.550.413
25.210.711
29.061.18
35.510.48
36.170.69
37.870.47
41.030.812
41.140.612
42.600.713
44.511.113
50.240.26
50.390.14
52.760.97
59.690.412
59.990.67
87.820.311
89.820.29
99.800.812
99.981.110
101.820.44
111.320.717
113.050.57
137.271.28
144.760.89
144.991.19
158.910.515
171.990.713
184.880.89
202.060.613
228.832.67
228.851.17
231.310.27
232.850.411
233.201.37
233.980.37
237.870.66
238.540.914
240.040.47
259.141.114
268.120.27
272.801.39
277.400.910
277.910.89
279.391.09
292.960.510
308.880.65
311.350.914
314.030.813
319.620.411
322.811.212
328.080.811
335.941.011
337.400.411
339.481.317
345.350.710
345.440.212
364.851.42
365.480.910
372.470.412
373.110.712
373.631.56
373.820.617
379.840.54
383.080.44
  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. 1.439 km WSW of Oasis, California, United States11-11 22:45
  4. 1.316 km NNE of Ramona, California, United States11-10 21:23
  5. 1.330 km E of San Diego Country Estates, California, United States11-08 02:42
  6. 1.341 km ENE of Valley Center, California, United States11-06 11:06
  7. 1.229 km SW of Oasis, California, United States11-10 04:42
  8. 1.232 km E of San Diego Country Estates, California, United States11-02 11:10
  9. 1.139 km ENE of San Diego Country Estates, California, United States10-31 21:52
  10. 1.139 km ENE of San Diego Country Estates, California, United States10-29 14:25
  11. 1.132 km E of San Diego Country Estates, California, United States11-07 13:03
  12. 1.141 km SW of La Quinta, California, United States11-06 06:45
  13. 1.123 km NNE of Ramona, California, United States10-28 22:58
  14. 1.134 km E of San Diego Country Estates, California, United States11-02 18:54
  15. 1.030 km E of San Diego Country Estates, California, United States11-08 09:17
  16. 1.036 km ENE of San Diego Country Estates, California, United States11-10 17:50
  17. 0.930 km WSW of Oasis, California, United States11-09 17:15
  18. 0.940 km SW of Oasis, California, United States11-06 16:26
  19. 0.930 km SW of Oasis, California, United States11-11 23:23
  20. 0.929 km ENE of San Diego Country Estates, California, United States10-29 22:40
  21. 0.920 km ENE of San Diego Country Estates, California, United States11-08 07:18
  22. 0.830 km E of San Diego Country Estates, California, United States11-08 07:49
  23. 0.823 km NNE of San Diego Country Estates, California, United States11-04 10:47
  24. 0.832 km SW of La Quinta, California, United States11-10 09:59
  25. 0.834 km E of San Diego Country Estates, California, United States11-02 18:39

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 ci41567856. First recorded here 27 Oct 2026, 17:57:10 UTC. Solutions: USGS · CI (usgs:ci41567856). Cite as: SeismoAtlas, “M0.9 earthquake 26 km NNE of San Diego Country Estates, California, United States”, https://seismoatlas.com/earthquake/ci41567856-m0-9-earthquake-26-km-nne-of-san-diego-country-estates-california-united-states, data from USGS.

JSON: /api/v1/events/ci41567856. SeismoAtlas is not an official warning service.