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M2.4 earthquake 4 km SE of San Ramon, California, United States

A magnitude 2.4 earthquake struck 4 km SE of San Ramon, California, United States at 16:29 local time (23:29 UTC) on 19 Oct 2026, at a depth of 7 km, according to USGS. The solution is preliminary and may be revised.

Data: USGS · updated 2026-10-19 23:31 UTC · automatic solution

Magnitude
2.4micro
duration magnitude (md)
Depth
7.1 km
Status
Automatic
Origin time
2026-10-19 23:29:57 UTC
Local: 19 Oct 2026, 16:29:57 (America/Los Angeles)
Epicentre
37.753° N, 121.946° 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 RamonCalifornia, United States · pop. 76,1344 kmIIIWeak
DublinCalifornia, United States · pop. 57,7216 kmIIWeak
DanvilleCalifornia, United States · pop. 44,4009 kmIIWeak
PleasantonCalifornia, United States · pop. 79,51012 kmIIWeak
OaklandCalifornia, United States · pop. 419,26729 kmINot felt
San FranciscoCalifornia, United States · pop. 827,52642 kmINot felt
San JoseCalifornia, United States · pop. 997,36846 kmINot felt
StocktonCalifornia, United States · pop. 305,65862 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. Likely felt out to about 5 km.

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 Survey2.4 md7.1 km37.75° N, 121.95° W–Automatic

How big was it?

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

It released roughly the energy of 58 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.

M2.4 releases about 31× the energy of M1.4, and its waves are about 9.8× taller on a seismogram. Energy: 58 kg of TNT vs 2 kg of TNT.

Each square is the energy of one M1.4. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

24 later earthquakes within 30 km; the largest was M2.6 10 days ago. 11 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.4

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
42.801.67
149.281.315
151.331.03
177.951.110
184.372.11
254.451.41
275.011.615
275.761.415
276.031.615
278.812.115
278.841.317
279.521.310
299.822.116
314.892.610
315.021.610
321.892.513
331.041.910
347.211.27
380.591.89
430.311.20
468.602.111
517.761.110
548.301.410
564.321.20
  1. 2.6Near Berkeley, California, United States11-02 02:23
  2. 2.5Near Pleasant Hill, California, United States11-02 09:23
  3. 2.14 km ENE of Danville, California, United States10-31 14:18
  4. 2.1Near Pleasant Hill, California, United States11-08 12:05
  5. 2.1Near Concord, California, United States11-01 11:18
  6. 2.112 km SE of Livermore, California, United States10-27 15:52
  7. 1.94 km SW of Dublin, California, United States11-02 18:32
  8. 1.8Near Pleasant Hill, California, United States11-04 20:05
  9. 1.64 km ENE of Danville, California, United States10-31 10:30
  10. 1.610 km ENE of Blackhawk, California, United States10-21 18:18
  11. 1.64 km ENE of Danville, California, United States10-31 11:31
  12. 1.6Near Berkeley, California, United States11-02 02:31
  13. 1.4Near Berkeley, California, United States11-11 19:48
  14. 1.44 km ENE of Danville, California, United States10-31 11:15
  15. 1.412 km SE of Livermore, California, United States10-30 13:57
  16. 1.35 km SSW of Pittsburg, California, United States10-26 04:46
  17. 1.34 km WNW of Blackhawk, California, United States10-31 14:20
  18. 1.34 km W of Blackhawk, California, United States10-31 15:01
  19. 1.2Near Clayton, California, United States11-06 21:48
  20. 1.2Near Danville, California, United States11-03 10:42
  21. 1.212 km SE of Livermore, California, United States11-12 11:49
  22. 1.1Near Alamo, California, United States10-27 09:26
  23. 1.1Near Pleasant Hill, California, United States11-10 13:15
  24. 1.06 km SSW of Moraga, California, United States10-26 06:49

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 nc75452281. First recorded here 19 Oct 2026, 23:32:12 UTC. Solutions: USGS · NC (usgs:nc75452281). Cite as: SeismoAtlas, “M2.4 earthquake 4 km SE of San Ramon, California, United States”, https://seismoatlas.com/earthquake/nc75452281-m2-4-earthquake-4-km-se-of-san-ramon-california-united-states, data from USGS.

JSON: /api/v1/events/nc75452281. SeismoAtlas is not an official warning service.