M7.4 earthquake 98 km ESE of Sucúa, Ecuador
A magnitude 7.4 earthquake struck 98 km ESE of Sucúa, Ecuador on Mon, Jul 26, 1971, 9:02 PM GMT-5 (02:02 UTC), 113 km (70 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 7.4 (mw), major
- Local time
- UTC
- 1971-07-27 02:02:49 UTC
- Depth
- 113.3 km (70.4 mi), intermediate-depth
- Epicenter
- 2.848° S, 77.379° W
- Region
- Ecuador
- Strongest shaking
- VII, very strong shaking
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Deaths and damage
From NOAA NCEI’s Significant Earthquake Database (record 4578), matched to this event by time and place.
- Deaths
- 1
- Injuries
- Some (about 51 to 100)
- Damage
- Moderate (about $1 to $5 million)
Where the literature gives no number, NCEI records a description on a scale of 1 to 4, printed here in its words. Damage is in millions of US dollars of the year of the event, not adjusted for inflation.
Shaking
The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.
- Strongest estimated
- VII, very strong shaking
- Peak ground acceleration
- 21.0% of gravity
- Peak ground velocity
- 2.6 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.
- Magnitude uncertainty
- ±0.10
- Depth from
- From location
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 4.4 and up: 0 in the 60 days after this one and 0 in the 30 days before it.
None recorded.
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event iscgem782797 (also filed as atlas19710727020246). Read Tue, Sep 29, 2026, 1:11 PM UTC.