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M1.3 earthquake 18 km E of Cloverdale, California, United States

A magnitude 1.3 earthquake struck 18 km E of Cloverdale, California, United States at 00:00 local time (07:00 UTC) on 27 Sept 2026, at a depth of 1 km, according to USGS. The solution is preliminary and may be revised.

Data: USGS · updated 2026-09-27 07:32 UTC · automatic solution

Magnitude
1.3micro
duration magnitude (md)
Depth
1 km
Status
Automatic
Origin time
2026-09-27 07:00:00 UTC
Local: 27 Sept 2026, 00:00:00 (America/Los Angeles)
Epicentre
38.791° N, 122.812° 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
CloverdaleCalifornia, United States · pop. 8,81118 kmINot felt
HealdsburgCalifornia, United States · pop. 11,74221 kmINot felt
WindsorCalifornia, United States · pop. 27,46427 kmINot felt
Santa RosaCalifornia, United States · pop. 178,12740 kmINot felt
Rohnert ParkCalifornia, United States · pop. 42,40751 kmINot felt
Agua CalienteCalifornia, United States · pop. 27,09059 kmINot felt
SacramentoCalifornia, United States · pop. 524,943117 kmINot felt
San FranciscoCalifornia, United States · pop. 827,526119 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 3 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 Survey1.3 md1 km38.79° N, 122.81° 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 1 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 1 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M1.3 releases about 2.5× the energy of M1.0, and its waves are about 1.9× taller on a seismogram. Energy: 1 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

85 later earthquakes within 30 km; the largest was M2.1 1 day ago. 165 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.3

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.680.53
0.940.62
1.572.02
1.571.52
1.600.32
3.470.81
3.610.72
3.620.72
3.701.12
3.970.72
4.080.71
4.321.12
4.790.62
4.810.32
5.561.32
6.240.83
9.121.33
9.330.83
9.920.93
12.691.12
12.720.71
12.772.13
12.801.23
13.021.13
13.091.42
14.051.22
14.371.52
14.670.33
14.740.82
16.101.10
17.260.84
20.830.73
20.870.82
21.521.25
21.531.86
22.110.31
22.821.52
23.220.82
23.510.82
23.811.02
24.961.33
25.690.916
25.901.45
26.421.52
27.190.82
27.690.34
27.790.83
28.320.82
29.530.83
30.540.83
32.810.71
33.320.72
33.330.72
33.631.63
34.940.82
35.261.12
35.610.51
36.000.62
37.352.11
37.360.61
37.370.80
37.370.80
37.441.40
38.240.73
43.151.10
45.561.14
46.721.31
46.800.92
47.860.92
48.141.02
49.050.71
49.160.22
49.221.13
50.371.52
52.481.32
52.541.12
52.960.72
52.980.73
54.200.81
54.441.22
54.620.51
54.990.92
55.850.93
56.380.82
56.430.81
  1. 2.118 km E of Cloverdale, California, United States09-27 19:45
  2. 2.116 km ENE of Cloverdale, California, United States09-28 20:20
  3. 2.019 km E of Cloverdale, California, United States09-27 08:34
  4. 1.810 km ESE of Cloverdale, California, United States09-28 04:31
  5. 1.620 km E of Cloverdale, California, United States09-28 16:37
  6. 1.519 km E of Cloverdale, California, United States09-27 08:34
  7. 1.518 km W of Hidden Valley Lake, California, United States09-28 05:48
  8. 1.515 km E of Cloverdale, California, United States09-28 09:25
  9. 1.518 km E of Cloverdale, California, United States09-27 21:22
  10. 1.518 km E of Cloverdale, California, United States09-29 09:22
  11. 1.416 km N of Healdsburg, California, United States09-28 08:53
  12. 1.416 km ENE of Cloverdale, California, United States09-28 20:26
  13. 1.418 km W of Hidden Valley Lake, California, United States09-27 20:05
  14. 1.318 km W of Hidden Valley Lake, California, United States09-29 05:43
  15. 1.319 km E of Cloverdale, California, United States09-27 16:06
  16. 1.320 km SW of Clearlake, California, United States09-29 11:28
  17. 1.314 km E of Cloverdale, California, United States09-28 07:57
  18. 1.320 km E of Cloverdale, California, United States09-27 12:33
  19. 1.210 km ESE of Cloverdale, California, United States09-28 04:30
  20. 1.213 km ENE of Cloverdale, California, United States09-29 13:26
  21. 1.217 km E of Cloverdale, California, United States09-27 21:03
  22. 1.219 km E of Cloverdale, California, United States09-27 19:47
  23. 1.120 km SW of Clearlake, California, United States09-29 11:32
  24. 1.119 km E of Cloverdale, California, United States09-27 20:01
  25. 1.118 km W of Hidden Valley Lake, California, United States09-27 23:06

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Reports on SeismoAtlas

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Event id nc75442917. First recorded here 28 Sept 2026, 17:32:09 UTC. Solutions: USGS · NC (usgs:nc75442917). Cite as: SeismoAtlas, “M1.3 earthquake 18 km E of Cloverdale, California, United States”, https://seismoatlas.com/earthquake/nc75442917-m1-3-earthquake-18-km-e-of-cloverdale-california-united-states, data from USGS.

JSON: /api/v1/events/nc75442917. SeismoAtlas is not an official warning service.