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M0.9 earthquake near Berkeley, California, United States

A magnitude 0.9 earthquake struck near Berkeley, California, United States at 22:03 local time (05:03 UTC) on 4 Oct 2026, at a depth of 4 km, according to USGS. The solution is preliminary and may be revised.

Data: USGS · updated 2026-10-05 05:05 UTC · automatic solution

Magnitude
0.9micro
duration magnitude (md)
Depth
4.5 km
Status
Automatic
Origin time
2026-10-05 05:03:35 UTC
Local: 4 Oct 2026, 22:03:35 (America/Los Angeles)
Epicentre
37.866° N, 122.247° 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
BerkeleyCalifornia, United States · pop. 120,9722 kmINot felt
PiedmontCalifornia, United States · pop. 11,3765 kmINot felt
OaklandCalifornia, United States · pop. 419,2678 kmINot felt
El CerritoCalifornia, United States · pop. 23,5498 kmINot felt
AlamedaCalifornia, United States · pop. 78,63011 kmINot felt
San FranciscoCalifornia, United States · pop. 827,52619 kmINot felt
San JoseCalifornia, United States · pop. 997,36866 kmINot felt
StocktonCalifornia, United States · pop. 305,65885 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 · NC.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · NCheadlineNorthern California Seismic System via U.S. Geological Survey0.9 md4.5 km37.87° N, 122.25° W–Automatic

How big was it?

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

It released roughly the energy of 304 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 4 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 1.6× the energy of M0.9, and its waves are about 1.3× taller on a seismogram. Energy: 477 g of TNT vs 304 g of TNT.

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

Aftershocks and nearby activity

28 later earthquakes within 30 km; the largest was M2.6 10 days ago. 2 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M0.9

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
8.721.77
14.081.69
182.671.46
205.651.40
215.711.27
215.791.715
319.681.69
331.361.87
332.241.16
332.721.46
333.081.68
333.192.47
333.541.79
354.442.47
505.771.03
532.391.110
629.441.615
630.201.415
630.471.615
633.252.115
633.281.317
633.961.310
654.262.116
669.332.610
669.461.610
676.332.513
681.501.112
701.651.27
  1. 2.6Near Berkeley, California, United States11-02 02:23
  2. 2.5Near Pleasant Hill, California, United States11-02 09:23
  3. 2.4Near San Ramon, California, United States10-19 02:15
  4. 2.44 km SE of San Ramon, California, United States10-19 23:29
  5. 2.14 km ENE of Danville, California, United States10-31 14:18
  6. 2.1Near Concord, California, United States11-01 11:18
  7. 1.8Near San Ramon, California, United States10-19 00:24
  8. 1.7Near Pleasant Hill, California, United States10-14 04:51
  9. 1.7Near San Ramon, California, United States10-19 02:35
  10. 1.74 km NW of Orinda, California, United States10-05 13:46
  11. 1.6Near Alamo, California, United States10-18 12:44
  12. 1.64 km ENE of Danville, California, United States10-31 10:30
  13. 1.6Near San Ramon, California, United States10-19 02:08
  14. 1.66 km SW of Clayton, California, United States10-05 19:08
  15. 1.64 km ENE of Danville, California, United States10-31 11:31
  16. 1.6Near Berkeley, California, United States11-02 02:31
  17. 1.43 km NNE of San Leandro, California, United States10-12 19:43
  18. 1.44 km ENE of Danville, California, United States10-31 11:15
  19. 1.47 km ENE of San Rafael, California, United States10-13 18:42
  20. 1.4Near San Ramon, California, United States10-19 01:46
  21. 1.34 km WNW of Blackhawk, California, United States10-31 14:20
  22. 1.34 km W of Blackhawk, California, United States10-31 15:01
  23. 1.2Near Alamo, California, United States10-14 04:46
  24. 1.2Near Danville, California, United States11-03 10:42
  25. 1.1Near San Ramon, California, United States10-19 01:17

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 nc75444811. First recorded here 5 Oct 2026, 05:05:47 UTC. Solutions: USGS · NC (usgs:nc75444811). Cite as: SeismoAtlas, “M0.9 earthquake near Berkeley, California, United States”, https://seismoatlas.com/earthquake/nc75444811-m0-9-earthquake-near-berkeley-california-united-states, data from USGS.

JSON: /api/v1/events/nc75444811. SeismoAtlas is not an official warning service.