Deep M5.6 earthquake strikes near Añatuya, Argentina on December 27, 2025

An earthquake of magnitude M5.6 was recorded at 10:40 UTC on December 27, 2025, approximately 37 km (23 miles) northwest of Añatuya, Argentina. The event occurred at a depth of 588.3 km (365.6 miles), placing it within the classification of a deep earthquake.

The earthquake’s coordinates were -28.3°S, -63.2°W, situating the epicenter inland in the Santiago del Estero province of northern Argentina. The region is characterized by rural landscapes with small towns, the closest being Añatuya. No significant population centers are located in the immediate vicinity of the hypocenter.

Major critical infrastructure in this part of Argentina typically includes regional roads and agricultural facilities, with limited presence of large airports, ports, or energy installations due to the inland, rural setting.

There is no tsunami threat associated with this earthquake, based on its location and available data.

USGS issued a green alert for this event, indicating a low likelihood of casualties or damage.

The maximum estimated intensity was approximately II. The significance index is 482 (on a scale that runs through 1 000), based on magnitude, felt reports, and estimated impact.

The affected region lies within the South American Plate, far from active subduction zones, but deep earthquakes can still occur here due to the complex dynamics of the Nazca Plate’s subduction beneath the continent.

This information was last updated at 11:07 UTC on December 27, 2025.