49 km SW of Cachí, Argentina

47 days ago

USGS

A magnitude 4.5 earthquake struck 49 km SW of Cachí, Argentina on 15 Sept 2026, 17:41 UTC. The hypocentre was 185.6 km below the surface — intermediate by seismological convention. 1 other earthquake above our reporting threshold has been recorded within 250 km in the past 30 days.

Depth: 185.6 km
Latitude: 25.46°S
Time: 17:41 UTC
Magnitude: M4.5

EPICENTRE

View the official report↗

MAGNITUDE 4.5

Noticeable shaking of indoor objects. Damage is unlikely.

The scale is logarithmic: this released about 180 times the energy of a magnitude 3.0, roughly the energy of 85 tonnes of TNT.

185.6 KM DEEP

At this depth the energy spreads before it reaches the surface. Shaking is usually weaker than a shallow earthquake of the same size, but it can be felt across a wider area.