USHUAIA, Argentina, July 24 — A magnitude 5.7 earthquake struck 292 kilometres south-southeast of this Tierra del Fuego port city at 23:10 UTC on Thursday, according to the U.S. Geological Survey. The quake’s shallow depth of 10 kilometres places it in the category of events that, with the same magnitude, produce stronger surface shaking than deeper tremors. The USGS detected the event through its real-time global seismic monitoring network.
No tsunami warning was issued. Under the hood, the technical reality of shallow earthquakes is instructive.
Seismologists classify any rupture less than 70 kilometres deep as shallow; the 10-kilometre depth here means the energy release is close to the crust, with less attenuation before it reaches the surface. For informed readers, the detail that matters is the difference between a magnitude 5.7 at 10 kilometres and one at, say, 100 kilometres: the shallow version will rattle buildings and loose ground more violently, even if the total energy release is identical. At magnitude 5.7, this is a moderate quake.
Such events fall squarely within the range that can cause minor to moderate damage near the epicentre — cracked walls, dislodged objects, the occasional chimney collapse — but rarely catastrophic structural failure unless the built environment is particularly fragile or the ground conditions amplify shaking. The epicentre, well offshore in the remote southern Atlantic waters, means any populated exposure is limited.
Seismic history of the region
The area is seismically active. The USGS records show at least 43 earthquakes of magnitude 5.0 or greater within approximately 300 kilometres of this spot over the past two decades. The strongest in that record was a magnitude 7.4 event in 2025 — a significantly larger release of energy, given the logarithmic nature of the magnitude scale.
That 2025 tremor underlines the tectonic reality of the Scotia Plate boundary region, where the South American and Antarctic plates interact through complex transform and convergent motion. This zone generates frequent moderate quakes punctuated by larger events every few years.
Seismologists caution that aftershocks are common following an earthquake of this size and may continue for days or weeks. People in the affected area — which, given the remote location, is a negligible population — are generally advised to be prepared for further shaking. The USGS will continue monitoring the sequence through its global network.
The precision of the location, 292 km SSE of Ushuaia, places the event in the Drake Passage, that notoriously rough stretch between South America and Antarctica. For those keeping score, this is not the kind of place where damage will be widespread — but the behaviour of the fault system bears watching.
A magnitude 5.7 is not a headline event, but it is a reminder that the region remains in a tectonically active phase. The next few days will tell whether this is a main shock with a decaying aftershock sequence, or a foreshock to something larger — though statistically, the latter is unlikely. The technical reality, as ever, is that the earth gives no guarantees.
