31 May 2026, 05:50 UTC · May 31, 1:50 AM ET

M4.5 earthquake 44 km S of Castro Barros, Argentina

A magnitude 4.5 earthquake struck 44 km S of Castro Barros, Argentina at May 31, 1:50 AM ET, 181 km deep, light – felt by most people nearby, rattling windows, rarely damage.

under 33–44–55–66+

Magnitude	4.5 mb
Time	31 May 2026, 05:50 UTC
Location	-30.980°, -65.674° – 44 km S of Castro Barros, Argentina
Depth	180.7 km
Felt reports	0
USGS event	us7000spmd

Within 100 km

Other earthquakes nearby this year

Mag.	Where	When (ET)	Depth	Felt
4.9	77 km NW of Candelaria, Argentina	Oct 28, 4:42 AM 354 d ago	147 km	–
4.8	22 km S of Serrezuela, Argentina	Dec 21, 2:02 AM 300 d ago	189 km	–
4.2	21 km WNW of Cruz del Eje, Argentina	Jan 20, 6:07 PM 269 d ago	10 km	5 reports

FAQ

About this earthquake

How strong was the 44 km S of Castro Barros, Argentina earthquake?

Magnitude 4.5 (mb), light – felt by most people nearby, rattling windows, rarely damage. Depth 181 km.

Was it felt?

No felt reports have been submitted to the USGS so far.

Were there aftershocks?

No earthquakes within 100 km have followed so far in our records.

Earthquakes

Source: U.S. Geological Survey (USGS) earthquake catalog, real-time feeds and FDSN event service; magnitudes and locations are revised by seismologists for hours after an event. Times are Eastern (ET) unless marked UTC. Not an alert service: for warnings follow local authorities and tsunami centers.