The 2013 Magnitude 7.0 Earthquake in the Falkland Islands Region

On November 25, 2013, at 06:27 UTC, a magnitude 7.0 earthquake struck the Falkland Islands region in the South Atlantic Ocean. The event occurred at a shallow depth of 11.7 km. This earthquake stands as the strongest recorded in the area since at least 2000, with its epicenter located directly within the Falkland Islands region. The Falkland Islands sit on the submerged Falkland Plateau, an extension of the South American continental margin. This geological setting places the islands amid a complex tectonic environment influenced by the interactions between the South American Plate and the Scotia Plate to the south. Although the region experiences relatively low seismic activity compared to major plate boundaries, intraplate stresses and distant transform faults can occasionally trigger moderate to strong events. The plateau itself formed through Mesozoic rifting associated with the breakup of Gondwana, leaving a stable but not entirely aseismic crustal block. Historical records indicate sparse seismicity around the Falklands prior to instrumental monitoring. The 2013 event highlighted the potential for larger earthquakes even in this remote setting, likely resulting from reactivation of ancient basement structures under regional compressional forces. No significant aftershocks or damage were widely reported given the offshore location and low population density. Updated assessments confirm that seismic hazard in the broader South Atlantic remains modest, with monitoring networks such as those operated by global agencies continuing to track activity. The 2013 mainshock provided valuable data on crustal behavior in this understudied margin.

References

USGS Earthquake Catalog Global Seismographic Network records