M2.1 earthquake 10km NNE of Simi Valley, CA
A magnitude 2.1 earthquake struck 10km NNE of Simi Valley, CA on Thu, Apr 28, 1966, 12:02 AM GMT-7 (07:02 UTC), 6 km (4 mi) below the surface.
A larger quake followed: M3.3 5km NW of Huntington Beach, CA. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 2.1 (mh), micro
- Local time
- UTC
- 1966-04-28 07:02:49 UTC
- Depth
- 6.0 km (3.7 mi), shallow
- Epicenter
- 34.354° N, 118.714° W
- Region
- California
- 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 3.5 km horizontally, 31.6 km in depth
- Magnitude uncertainty
- ±0.20
- Depth from
- Operator assigned
- Station coverage gap
- 242°, poorly surrounded by stations
- Stations used
- 5
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 8 in the 60 days after this one and 3 in the 30 days before it.
After
- 2.95km WSW of Grapevine, CA · 22065 days ago · 15 km deep · 69 km away
- 2.43km NW of Sunland, CA · 22061 days ago · 6 km deep · 36 km away
- 2.42km WSW of Granada Hills, CA · 22038 days ago · 7 km deep · 21 km away
- 2.417km SSE of Carpinteria, CA · 22032 days ago · 17 km deep · 68 km away
- 3.35km NW of Huntington Beach, CA · 22023 days ago · 6 km deep · 93 km away
- 2.534km SE of Santa Cruz Is. (E end), CA · 22020 days ago · 6 km deep · 79 km away
- 1.94km NE of Altadena, CA · 22016 days ago · 5 km deep · 59 km away
- 2.99km SW of Lamont, CA · 22011 days ago · 6 km deep · 99 km away
Before
Earthquakes todayCalifornia earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event ci3330213. Read Wed, Sep 30, 2026, 4:31 AM UTC.