California earthquakes

M1.7 earthquake 10 km SW of Ridgemark, CA

A magnitude 1.7 earthquake struck 10 km SW of Ridgemark, CA on Mon, Sep 21, 2026, 3:34 PM PDT (22:34 UTC), 8 km (5 mi) below the surface.

Automatic solution: the magnitude and location may still be revised.

A larger quake followed: M1.9 10 km SSW of Tres Pinos, CA. This one was a foreshock.

Ridgemark forecastMore in California

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
1.7 (md), micro
Local time
UTC
2026-09-21 22:34:41 UTC
Depth
7.7 km (4.8 mi), shallow
Epicenter
36.736° N, 121.431° W
Tsunami flag
No
Status
Automatic solution, may be revised

Did you feel it?

No one has reported feeling this quake to the USGS. If you felt it, tell the USGS: every report sharpens the shaking map.

How well it is located

An automatic solution; a seismologist may revise it.

Location uncertainty
About 0.4 km horizontally, 0.9 km in depth
Magnitude uncertainty
±0.18
Depth from
From location
Station coverage gap
92°
Stations used
19

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 3 since this one and 42 in the 30 days before it.

After

  1. 1.58 km E of Alum Rock, CA · 12 hr ago · 2 km deep · 74 km away
  2. 1.516 km S of Tres Pinos, CA · 4 hr ago · 5 km deep · 15 km away
  3. 1.910 km SSW of Tres Pinos, CA · 3 hr ago · 1 km deep · 5 km away

Before

  1. 1.54 km N of Aromas, CA · 3 days ago · 4 km deep · 28 km away
  2. 2.510 km ENE of Milpitas, CA · 3 days ago · 3 km deep · 88 km away · felt by 9
  3. 2.62 km ENE of Aromas, CA · 5 days ago · 1 km deep · 24 km away
  4. 2.621 km E of Alum Rock, CA · 5 days ago · 6 km deep · 68 km away · felt by 5
  5. 1.631 km NE of Pinnacles, CA · 5 days ago · -1 km deep · 50 km away
  6. 1.65 km E of Pinnacles, CA · 6 days ago · 11 km deep · 37 km away
  7. 2.011 km SE of Pinnacles, CA · 6 days ago · 5 km deep · 45 km away
  8. 1.718 km ENE of San Lucas, CA · 6 days ago · 4 km deep · 81 km away
  9. 1.911 km SW of King City, CA · 7 days ago · 7 km deep · 71 km away
  10. 1.55 km NNW of Hollister, CA · 9 days ago · 10 km deep · 17 km away
  11. 2.132 km SW of South Dos Palos, CA · 9 days ago · 5 km deep · 50 km away
  12. 1.610 km NW of Pinnacles, CA · 9 days ago · 1 km deep · 25 km away
  13. 1.616 km E of Seven Trees, CA · 9 days ago · 6 km deep · 65 km away
  14. 1.914 km ENE of Hollister, CA · 10 days ago · 8 km deep · 24 km away
  15. 1.65 km NW of Pinnacles, CA · 12 days ago · 3 km deep · 30 km away
  16. 1.51 km E of Aromas, CA · 12 days ago · 6 km deep · 25 km away
  17. 1.98 km NE of Alum Rock, CA · 13 days ago · 7 km deep · 80 km away
  18. 1.85 km N of Alum Rock, CA · 13 days ago · 0 km deep · 83 km away
  19. 1.62 km SSW of Hollister, CA · 14 days ago · 9 km deep · 11 km away
  20. 2.022 km NE of San Lucas, CA · 14 days ago · 7 km deep · 77 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc75439692. Read Tue, Sep 22, 2026, 12:17 PM UTC.