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M2.0 earthquake 8 km WSW of Calistoga, California, United States

A magnitude 2.0 earthquake struck 8 km WSW of Calistoga, California, United States at 11:47 local time (18:47 UTC) on 29 Sept 2026, at a depth of 0 km, according to USGS. The solution is preliminary and may be revised.

Data: USGS · updated 2026-09-29 18:49 UTC · automatic solution

Magnitude
2.0micro
duration magnitude (md)
Depth
0.4 km
Status
Automatic
Origin time
2026-09-29 18:47:28 UTC
Local: 29 Sept 2026, 11:47:28 (America/Los Angeles)
Epicentre
38.554° N, 122.660° W

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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
CalistogaCalifornia, United States · pop. 5,3308 kmIIWeak
Larkfield-WikiupCalifornia, United States · pop. 8,8849 kmIIWeak
Santa RosaCalifornia, United States · pop. 178,12713 kmINot felt
WindsorCalifornia, United States · pop. 27,46414 kmINot felt
Rohnert ParkCalifornia, United States · pop. 42,40724 kmINot felt
Agua CalienteCalifornia, United States · pop. 27,09030 kmINot felt
San FranciscoCalifornia, United States · pop. 827,52690 kmINot felt
OaklandCalifornia, United States · pop. 419,26791 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 6 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 Survey2.0 md0.4 km38.55° N, 122.66° W–Automatic

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How big was it?

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

It released roughly the energy of 16 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 0 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M2.0 releases about 34× the energy of M1.0, and its waves are about 10× taller on a seismogram. Energy: 16 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

81 later earthquakes within 30 km; the largest was M2.5 12 days ago. 62 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.0

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.151.32
2.992.24
3.040.83
4.370.32
4.701.02
5.511.13
5.781.13
5.831.33
6.121.30
6.131.12
13.171.12
13.720.8-1
17.111.31
18.160.83
18.450.83
24.720.82
26.012.52
33.711.72
34.021.01
35.431.87
48.231.13
51.481.73
51.721.43
63.891.41
92.941.13
94.801.12
102.450.24
104.031.03
106.981.10
119.161.53
120.351.12
121.100.9-1
121.990.84
125.561.02
128.390.82
129.321.47
130.580.710
132.310.83
136.961.64
140.070.31
142.170.71
153.650.81
156.911.20
157.301.01
161.460.82
178.581.02
179.120.74
180.300.83
180.481.12
181.931.91
181.970.80
183.380.60
184.101.11
186.271.86
194.900.52
196.430.81
198.851.11
207.691.31
215.180.94
218.870.80
220.170.90
222.231.12
229.270.92
229.491.12
233.861.11
233.891.30
234.121.01
244.001.13
265.931.81
266.232.10
266.331.82
272.331.61
276.171.60
279.741.90
291.771.11
295.150.83
305.190.82
308.552.02
308.551.12
310.450.81
313.000.93
  1. 2.513 km WSW of Hidden Valley Lake, California, United States09-30 20:48
  2. 2.28 km W of Cotati, California, United States09-29 21:47
  3. 2.17 km N of Saint Helena, California, United States10-10 21:01
  4. 2.017 km W of Hidden Valley Lake, California, United States10-12 15:20
  5. 1.912 km NW of Agua Caliente, California, United States10-11 10:31
  6. 1.916 km WSW of Hidden Valley Lake, California, United States10-07 08:43
  7. 1.814 km NNE of Calistoga, California, United States10-07 13:03
  8. 1.816 km WSW of Hidden Valley Lake, California, United States10-10 21:07
  9. 1.84 km S of Larkfield-Wikiup, California, United States10-01 06:13
  10. 1.817 km W of Hidden Valley Lake, California, United States10-10 20:43
  11. 1.719 km W of Hidden Valley Lake, California, United States10-01 22:16
  12. 1.714 km WSW of Hidden Valley Lake, California, United States10-01 04:30
  13. 1.618 km W of Hidden Valley Lake, California, United States10-11 03:07
  14. 1.68 km NNE of Saint Helena, California, United States10-11 06:57
  15. 1.618 km W of Hidden Valley Lake, California, United States10-05 11:45
  16. 1.519 km W of Hidden Valley Lake, California, United States10-04 17:57
  17. 1.416 km W of Hidden Valley Lake, California, United States10-02 10:40
  18. 1.420 km W of Hidden Valley Lake, California, United States10-01 22:30
  19. 1.411 km SSE of Saint Helena, California, United States10-05 04:06
  20. 1.318 km E of Cloverdale, California, United States09-30 00:37
  21. 1.317 km WSW of Hidden Valley Lake, California, United States10-08 10:28
  22. 1.317 km W of Hidden Valley Lake, California, United States10-09 12:40
  23. 1.318 km W of Hidden Valley Lake, California, United States09-30 00:54
  24. 1.317 km W of Hidden Valley Lake, California, United States09-30 11:54
  25. 1.315 km W of Hidden Valley Lake, California, United States09-29 18:56

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Reports on SeismoAtlas

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Event id nc75444497. First recorded here 29 Sept 2026, 18:50:02 UTC. Solutions: USGS · NC (usgs:nc75444497). Cite as: SeismoAtlas, “M2.0 earthquake 8 km WSW of Calistoga, California, United States”, https://seismoatlas.com/earthquake/nc75444497-m2-0-earthquake-8-km-wsw-of-calistoga-california-united-states, data from USGS.

JSON: /api/v1/events/nc75444497. SeismoAtlas is not an official warning service.