M4.3 earthquake 225 km N of Puerto Ayora, Ecuador
A magnitude 4.3 earthquake struck 225 km N of Puerto Ayora, Ecuador on Mon, May 20, 1985, 7:46 PM GMT-6 (01:46 UTC), 10 km (6 mi) below the surface.
A larger quake followed: M4.6 232 km NNW of Puerto Ayora, Ecuador. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.3 (mb), light
- Local time
- UTC
- 1985-05-21 01:46:51 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 1.259° N, 90.704° W
- Region
- Ecuador
- 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
Nearby
Within 100 km, magnitude 1.5 and up: 1 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todayEcuador earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002f18. Read Wed, Sep 30, 2026, 9:52 AM UTC.