California earthquakes

M2.8 earthquake 4km NW of Willowbrook, CA

A magnitude 2.8 earthquake struck 4km NW of Willowbrook, CA on Sun, Sep 14, 1969, 8:33 AM GMT-7 (15:33 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.6 7km W of Santa Barbara Is., CA. This one was a foreshock.

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Map

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

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The earthquake

Magnitude
2.8 (ML, local (Richter)), micro
Magnitude from
Southern California Seismic Network
Local time
UTC
1969-09-14 15:33:06 UTC
Depth
9.9 km (6.2 mi), shallow
Epicenter
33.941° N, 118.284° W
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 2.9 km horizontally, 3.0 km in depth
Magnitude uncertainty
±0.29
Depth from
From location
Station coverage gap
162°
Stations used
11

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 11 in the 60 days after this one and 4 in the 30 days before it.

After

  1. 2.52km ESE of Fontana, CA · 20829 days ago · 3 km deep · 79 km away
  2. 2.16km NNW of Crestline, CA · 20826 days ago · 2 km deep · 98 km away
  3. 3.56km ESE of Wrightwood, CA · 20807 days ago · 6 km deep · 79 km away
  4. 3.17km SSW of Santa Barbara Is., CA · 20797 days ago · 6 km deep · 95 km away
  5. 3.215km S of Santa Barbara Is., CA · 20796 days ago · 6 km deep · 98 km away
  6. 4.42km SW of Laguna Beach, CA · 20794 days ago · 6 km deep · 64 km away
  7. 3.115km S of Santa Barbara Is., CA · 20794 days ago · 17 km deep · 98 km away
  8. 2.911km SW of Santa Barbara Is., CA · 20793 days ago · 6 km deep · 99 km away
  9. 4.67km W of Santa Barbara Is., CA · 20790 days ago · 6 km deep · 95 km away
  10. 3.010km SW of Santa Barbara Is., CA · 20790 days ago · 6 km deep · 98 km away
  11. 3.311km SW of Santa Barbara Is., CA · 20780 days ago · 6 km deep · 100 km away

Before

  1. 2.727km SE of Santa Barbara Is., CA · 20850 days ago · 6 km deep · 89 km away
  2. 2.51km ENE of Grand Terrace, CA · 20852 days ago · 9 km deep · 91 km away
  3. 3.12km ENE of Grand Terrace, CA · 20853 days ago · 6 km deep · 92 km away
  4. 2.56km N of Pacoima, CA · 20867 days ago · 6 km deep · 46 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event ci3326191. Read Fri, Oct 2, 2026, 1:02 PM UTC.