M2.0 earthquake 6 km E of Copperopolis, California
A magnitude 2.0 earthquake struck 6 km E of Copperopolis, California on Wed, Dec 21, 1977, 7:48 AM PST (15:48 UTC), 8 km (5 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 2.0 (md), micro
- Local time
- UTC
- 1977-12-21 15:48:31 UTC
- Depth
- 8.3 km (5.2 mi), shallow
- Epicenter
- 37.971° N, 120.575° 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 0.8 km horizontally, 1.8 km in depth
- Magnitude uncertainty
- ±0.03
- Depth from
- From location
- Station coverage gap
- 133°
- Stations used
- 4
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 3 in the 60 days after this one and 3 in the 30 days before it.
After
- 1.811 km SW of Markleeville, California · 17803 days ago · 5 km deep · 95 km away
- 1.63 km WNW of Volcano, California · 17786 days ago · 5 km deep · 54 km away
- 1.815 km WSW of Coleville, California · 17759 days ago · 5 km deep · 100 km away
Before
Earthquakes todayCalifornia earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event nc1038224. Read Tue, Sep 22, 2026, 9:40 PM UTC.