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M0.7 earthquake 50 km E of Alpine, California, United States

A magnitude 0.7 earthquake struck 50 km E of Alpine, California, United States at 09:36 local time (16:36 UTC) on 28 Oct 2026, at a depth of 8 km, according to USGS.

revised from M0.8

Data: USGS · updated 2026-10-29 19:10 UTC · reviewed

Magnitude
0.7micro
local magnitude (Richter) (ml)
revised from 0.8
Depth
7.8 km
Status
Reviewed
Origin time
2026-10-28 16:36:36 UTC
Local: 28 Oct 2026, 09:36:36 (America/Los Angeles)
Epicentre
32.915° N, 116.244° 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
AlpineCalifornia, United States · pop. 14,23650 kmINot felt
San Diego Country EstatesCalifornia, United States · pop. 10,10951 kmINot felt
TecateBaja California, Mexico · pop. 64,76453 kmINot felt
RamonaCalifornia, United States · pop. 20,29260 kmINot felt
LakesideCalifornia, United States · pop. 20,64863 kmINot felt
Winter GardensCalifornia, United States · pop. 20,63165 kmINot felt
MexicaliBaja California, Mexico · pop. 1,032,68681 kmINot felt
Chula VistaCalifornia, United States · pop. 265,75784 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 Survey0.7 mlwas 0.87.8 km32.92° N, 116.24° W–Reviewed · 1 revision

How big was it?

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

It released roughly the energy of 181 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 2.6× the energy of M0.7, and its waves are about 1.9× taller on a seismogram. Energy: 477 g of TNT vs 181 g of TNT.

Each square is the energy of one M0.7. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

34 later earthquakes within 30 km; the largest was M1.9 12 days ago. 11 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M0.7

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
12.800.48
13.470.69
15.170.47
17.490.97
21.330.88
25.231.16
28.760.711
30.060.97
36.980.412
37.290.67
38.311.49
57.281.210
60.630.98
65.131.97
65.770.612
75.580.519
114.571.28
122.050.89
122.291.19
123.670.89
133.030.910
135.201.411
138.610.214
220.141.910
230.510.913
236.441.114
250.101.39
255.210.89
256.691.09
270.361.011
270.991.010
297.211.010
316.781.210
363.850.89
  1. 1.945 km E of San Diego Country Estates, California, United States10-31 09:44
  2. 1.937 km W of Imperial, California, United States11-06 20:45
  3. 1.429 km E of San Diego Country Estates, California, United States11-03 07:48
  4. 1.448 km W of Santa Isabel, Baja California, Mexico10-30 06:54
  5. 1.330 km E of San Diego Country Estates, California, United States11-08 02:42
  6. 1.252 km ENE of Tecate, Baja California, Mexico11-10 21:23
  7. 1.248 km W of Santa Isabel, Baja California, Mexico10-31 01:53
  8. 1.232 km E of San Diego Country Estates, California, United States11-02 11:10
  9. 1.132 km E of San Diego Country Estates, California, United States11-07 13:03
  10. 1.146 km E of San Diego Country Estates, California, United States10-29 17:50
  11. 1.134 km E of San Diego Country Estates, California, United States11-02 18:54
  12. 1.052 km ENE of Tecate, Baja California, Mexico11-10 01:49
  13. 1.030 km E of San Diego Country Estates, California, United States11-08 09:17
  14. 1.052 km ENE of Tecate, Baja California, Mexico11-08 22:58
  15. 1.052 km NE of Tecate, Baja California, Mexico11-08 23:35
  16. 0.945 km S of Oasis, California, United States10-29 10:05
  17. 0.934 km E of San Diego Country Estates, California, United States11-07 07:06
  18. 0.944 km S of Oasis, California, United States10-31 05:14
  19. 0.938 km SSW of Oasis, California, United States11-03 05:38
  20. 0.929 km ENE of San Diego Country Estates, California, United States10-29 22:40
  21. 0.830 km E of San Diego Country Estates, California, United States11-08 07:49
  22. 0.834 km E of San Diego Country Estates, California, United States11-02 18:39
  23. 0.835 km E of San Diego Country Estates, California, United States11-02 20:16
  24. 0.847 km E of San Diego Country Estates, California, United States10-29 13:56
  25. 0.844 km S of Oasis, California, United States11-12 20:27

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 ci41568264. First recorded here 28 Oct 2026, 17:31:10 UTC. Solutions: USGS · CI (usgs:ci41568264). Cite as: SeismoAtlas, “M0.7 earthquake 50 km E of Alpine, California, United States”, https://seismoatlas.com/earthquake/ci41568264-m0-7-earthquake-50-km-e-of-alpine-california-united-states, data from USGS.

JSON: /api/v1/events/ci41568264. SeismoAtlas is not an official warning service.