Skip to content
SeismoAtlas

M1.7 earthquake 4 km NW of Orinda, California, United States

A magnitude 1.7 earthquake struck 4 km NW of Orinda, California, United States at 06:46 local time (13:46 UTC) on 5 Oct 2026, at a depth of 7 km, according to USGS. The solution is preliminary and may be revised.

Data: USGS · updated 2026-10-05 13:48 UTC · automatic solution

Magnitude
1.7micro
duration magnitude (md)
Depth
6.6 km
Status
Automatic
Origin time
2026-10-05 13:46:40 UTC
Local: 5 Oct 2026, 06:46:40 (America/Los Angeles)
Epicentre
37.899° N, 122.215° 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
OrindaCalifornia, United States · pop. 19,2794 kmIIWeak
BerkeleyCalifornia, United States · pop. 120,9726 kmINot felt
LafayetteCalifornia, United States · pop. 25,8438 kmINot felt
El CerritoCalifornia, United States · pop. 23,5499 kmINot felt
OaklandCalifornia, United States · pop. 419,26712 kmINot felt
San FranciscoCalifornia, United States · pop. 827,52623 kmINot felt
San JoseCalifornia, United States · pop. 997,36868 kmINot felt
StocktonCalifornia, United States · pop. 305,65881 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 Survey1.7 md6.6 km37.90° N, 122.21° W–Automatic

How big was it?

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

It released roughly the energy of 5 kg 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 7 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M1.7 releases about 11× the energy of M1.0, and its waves are about 5× taller on a seismogram. Energy: 5 kg 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

28 later earthquakes within 30 km; the largest was M2.6 10 days ago. 3 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.7

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
5.361.69
173.951.46
196.931.40
206.991.27
207.081.715
310.961.69
322.641.87
323.521.16
324.001.46
324.371.68
324.482.47
324.821.79
345.722.47
495.001.315
497.051.03
509.322.04
523.671.110
620.731.615
621.481.415
621.751.615
624.542.115
624.571.317
625.241.310
645.542.116
660.612.610
660.741.610
667.622.513
692.931.27
  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. 2.09 km N of Benicia, California, United States10-26 19:05
  8. 1.8Near San Ramon, California, United States10-19 00:24
  9. 1.7Near Pleasant Hill, California, United States10-14 04:51
  10. 1.7Near San Ramon, California, United States10-19 02:35
  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. 1.35 km SSW of Pittsburg, California, United States10-26 04:46
  22. 1.34 km WNW of Blackhawk, California, United States10-31 14:20
  23. 1.34 km W of Blackhawk, California, United States10-31 15:01
  24. 1.2Near Alamo, California, United States10-14 04:46
  25. 1.2Near Danville, California, United States11-03 10:42

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 nc75444951. First recorded here 5 Oct 2026, 13:49:10 UTC. Solutions: USGS · NC (usgs:nc75444951). Cite as: SeismoAtlas, “M1.7 earthquake 4 km NW of Orinda, California, United States”, https://seismoatlas.com/earthquake/nc75444951-m1-7-earthquake-4-km-nw-of-orinda-california-united-states, data from USGS.

JSON: /api/v1/events/nc75444951. SeismoAtlas is not an official warning service.