M6.6 earthquake 144 km NE of Massawa, Eritrea
A magnitude 6.6 earthquake struck 144 km NE of Massawa, Eritrea on Wed, Dec 28, 1977, 5:45 AM GMT+3 (02:45 UTC), 33 km (21 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 6.6 (ms), strong
- Local time
- UTC
- 1977-12-28 02:45:36 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 16.659° N, 40.278° E
- Region
- Eritrea
- Strongest shaking
- VI, strong shaking
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Shaking
The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.
- Strongest estimated
- VI, strong shaking
- Peak ground acceleration
- 6.7% of gravity
- Peak ground velocity
- 2.1 cm/s
- Map
- Automatic
Did you feel it?
No one has reported feeling this quake to the USGS.
How well it is located
Reviewed by a seismologist.
- Depth from
- OPERATOR_ASSIGNED
- Stations used
- 186
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.5 and up: 3 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todayEritrea earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000s8t (also filed as gcmtc122877a, gcmt19771228024536, atlas19771228024534, iscgem689591). Read Tue, Sep 22, 2026, 8:53 AM UTC.