M2.8 earthquake 247 km W of Ferndale, California
A magnitude 2.8 earthquake struck 247 km W of Ferndale, California on Sun, Apr 4, 2021, 2:11 PM PDT (21:11 UTC), 12 km (8 mi) below the surface.
A larger quake followed: M4.3 265 km W of Ferndale, California. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 2.8 (ML, local (Richter)), micro
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2021-04-04 21:11:55 UTC
- Depth
- 12.4 km (7.7 mi), shallow
- Epicenter
- 40.373° N, 127.175° W
- Region
- California
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Magnitude estimates
Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.
| Mag. | Scale | Computed by | Notes |
|---|---|---|---|
| 2.8 | ML, local (Richter) | USGS National Earthquake Information Center | Preferred · Reviewed · ±0.055 · 43 stations |
| 3.01 | ML, local (Richter) | Northern California Seismic System | Final · ±0.109 · 3 stations |
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 6.3 km horizontally, 10.1 km in depth
- Magnitude uncertainty
- ±0.06
- Depth from
- From location
- Station coverage gap
- 261°, poorly surrounded by stations
- Stations used
- 51
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 7 in the 60 days after this one and 0 in the 30 days before it.
After
- 3.2off the coast of Northern California · 1991 days ago · 15 km deep · 69 km away · felt by 1
- 2.9186 km W of Ferndale, California · 1991 days ago · 10 km deep · 76 km away
- 3.0203 km W of Ferndale, California · 1991 days ago · 16 km deep · 61 km away
- 2.8189 km W of Ferndale, California · 1991 days ago · 10 km deep · 77 km away
- 2.6186 km W of Ferndale, California · 1991 days ago · 10 km deep · 85 km away
- 3.0170 km W of Ferndale, California · 1985 days ago · 11 km deep · 77 km away
- 4.3265 km W of Ferndale, California · 1982 days ago · 10 km deep · 80 km away · felt by 1
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event us6000dz0b (also filed as nc73545545). Read Mon, Oct 5, 2026, 3:02 AM UTC.