M3.9 earthquake 12 km SW of Tumbiscatío de Ruiz, Mexico
A magnitude 3.9 earthquake struck 12 km SW of Tumbiscatío de Ruiz, Mexico on Tue, Oct 27, 1981, 10:24 PM CST (04:24 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M5.1 10 km N of La Unión, Mexico. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 3.9 (mb), minor
- Local time
- UTC
- 1981-10-28 04:24:53 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 18.464° N, 102.476° W
- Region
- Mexico
- 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.
- Depth from
- OPERATOR_ASSIGNED
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 2 in the 60 days after this one and 4 in the 30 days before it.
After
- 5.110 km N of La Unión, Mexico · 16402 days ago · 60 km deep · 82 km away
- 4.717 km ESE of La Mira Tumbiscatio, Mexico · 16362 days ago · 104 km deep · 39 km away
Before
- 4.14 km S of Petacalco, Mexico · 16409 days ago · 33 km deep · 70 km away
- 4.510 km ENE of Petacalco, Mexico · 16410 days ago · 33 km deep · 70 km away
- 5.246 km SW of El Habillal, Mexico · 16410 days ago · 33 km deep · 84 km away
- 7.37 km NNE of Petacalco, Mexico · 16410 days ago · 33 km deep · 62 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0001gpu. Read Mon, Sep 28, 2026, 10:56 PM UTC.