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M0.9 earthquake 15 km SW of Hidden Valley Lake, California, United States

A magnitude 0.9 earthquake struck 15 km SW of Hidden Valley Lake, California, United States at 02:56 local time (10:56 UTC) on 8 Nov 2026, at a depth of -1 km, according to USGS. The solution is preliminary and may be revised.

Data: USGS · updated 2026-11-08 10:57 UTC · automatic solution

Magnitude
0.9micro
duration magnitude (md)
Depth
-0.8 km
Status
Automatic
Origin time
2026-11-08 10:56:19 UTC
Local: 8 Nov 2026, 02:56:19 (America/Los Angeles)
Epicentre
38.724° N, 122.697° 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
Hidden Valley LakeCalifornia, United States · pop. 5,57915 kmINot felt
CalistogaCalifornia, United States · pop. 5,33019 kmINot felt
WindsorCalifornia, United States · pop. 27,46422 kmINot felt
Santa RosaCalifornia, United States · pop. 178,12732 kmINot felt
Rohnert ParkCalifornia, United States · pop. 42,40743 kmINot felt
Agua CalienteCalifornia, United States · pop. 27,09048 kmINot felt
SacramentoCalifornia, United States · pop. 524,943106 kmINot felt
San FranciscoCalifornia, United States · pop. 827,526109 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 2 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 Survey0.9 md-0.8 km38.72° N, 122.70° W–Automatic

How big was it?

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

It released roughly the energy of 294 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 -1 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 1.4× taller on a seismogram. Energy: 477 g of TNT vs 294 g of TNT.

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

Aftershocks and nearby activity

134 later earthquakes within 30 km; the largest was M2.6 4 days ago. 196 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M0.9

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.081.52
1.060.72
2.330.61
3.211.62
3.421.32
4.910.82
7.550.71
7.771.73
7.771.22
7.881.12
8.540.72
10.840.71
10.891.01
11.801.02
12.661.02
12.791.00
13.161.62
13.241.32
13.440.82
13.802.60
14.331.03
14.601.40
14.741.33
14.990.72
15.211.02
16.001.32
17.050.21
17.220.72
17.730.93
18.910.82
19.371.12
19.691.13
24.790.92
25.710.72
26.520.62
27.941.02
29.581.03
30.210.72
30.230.42
31.411.12
31.480.82
31.490.42
31.501.22
31.530.82
32.420.92
33.520.82
33.830.73
34.861.02
35.331.14
35.821.10
36.180.62
36.981.04
39.261.01
39.400.42
40.040.72
41.100.61
42.821.12
43.371.44
43.630.72
43.890.81
44.510.83
44.630.72
48.330.33
48.390.52
49.420.95
50.271.62
50.671.31
52.770.72
54.030.81
56.151.22
56.330.73
59.091.12
60.670.82
60.950.72
62.151.12
62.561.12
64.260.82
64.950.72
65.181.12
66.810.92
68.080.72
69.350.52
69.860.72
71.251.02
71.470.82
71.830.52
73.730.92
73.741.12
74.181.41
74.221.21
76.990.73
77.180.90
77.250.73
77.560.51
77.950.72
78.120.72
80.000.83
82.201.31
82.571.62
83.500.82
84.451.03
85.850.74
86.210.94
87.521.01
88.781.74
89.260.62
90.200.53
90.231.12
92.281.22
92.340.72
92.380.82
92.740.81
93.600.73
95.560.72
95.801.02
95.850.71
95.860.72
98.071.12
98.881.72
99.331.62
100.121.02
101.421.31
102.150.33
102.261.02
102.380.83
102.830.93
103.661.12
104.201.50
104.590.67
104.651.12
107.651.21
107.901.52
108.280.91
109.590.84
  1. 2.618 km W of Hidden Valley Lake, California, United States11-09 00:44
  2. 1.718 km E of Cloverdale, California, United States11-08 18:42
  3. 1.77 km SE of Cloverdale, California, United States11-12 03:43
  4. 1.718 km E of Cloverdale, California, United States11-12 13:48
  5. 1.616 km E of Cloverdale, California, United States11-08 14:08
  6. 1.618 km W of Hidden Valley Lake, California, United States11-12 14:16
  7. 1.616 km W of Hidden Valley Lake, California, United States11-09 00:05
  8. 1.614 km WSW of Hidden Valley Lake, California, United States11-10 13:12
  9. 1.618 km W of Hidden Valley Lake, California, United States11-11 21:30
  10. 1.518 km E of Cloverdale, California, United States11-08 11:01
  11. 1.519 km E of Cloverdale, California, United States11-12 19:08
  12. 1.518 km E of Cloverdale, California, United States11-12 22:50
  13. 1.414 km WSW of Hidden Valley Lake, California, United States11-11 13:06
  14. 1.418 km W of Hidden Valley Lake, California, United States11-09 01:32
  15. 1.48 km ESE of Cloverdale, California, United States11-10 06:18
  16. 1.314 km WSW of Hidden Valley Lake, California, United States11-08 14:21
  17. 1.315 km E of Cloverdale, California, United States11-09 02:56
  18. 1.320 km W of Hidden Valley Lake, California, United States11-10 13:36
  19. 1.316 km W of Hidden Valley Lake, California, United States11-09 00:10
  20. 1.319 km SW of Clearlake, California, United States11-11 21:08
  21. 1.320 km W of Hidden Valley Lake, California, United States11-09 01:40
  22. 1.316 km W of Hidden Valley Lake, California, United States11-12 16:21
  23. 1.218 km E of Cloverdale, California, United States11-10 19:05
  24. 1.218 km E of Cloverdale, California, United States11-09 18:26
  25. 1.218 km E of Cloverdale, California, United States11-08 18:42

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Reports on SeismoAtlas

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Event id nc75463927. First recorded here 8 Nov 2026, 10:59:20 UTC. Solutions: USGS · NC (usgs:nc75463927). Cite as: SeismoAtlas, “M0.9 earthquake 15 km SW of Hidden Valley Lake, California, United States”, https://seismoatlas.com/earthquake/nc75463927-m0-9-earthquake-15-km-sw-of-hidden-valley-lake-california-united-states, data from USGS.

JSON: /api/v1/events/nc75463927. SeismoAtlas is not an official warning service.