The 2011 Falkland Islands mass stranding events and the South Atlantic Meteor Airburst

In March 2011, the International Monitoring System (IMS) and the SuperDARN radar in the Falkland Islands recorded significant activity in the upper atmosphere. Acoustic Coupling: Data from the Falkland Islands SuperDARN radar (52° S, 59° W) recorded intense "meteor wind" activity in the upper mesosphere during early 2011. This radar is designed to detect the ionized trails of meteors; in the weeks leading up to March 12 stranding below, it showed a high density of these trails over the South Atlantic. Infrasonic "Triggers": Bolides like the March 1 event (See The Big Event below) generate infrasound (sound below 20 Hz) that can travel thousands of kilometers through the AtmoSOFAR channel. This specific frequency range is known to be detectable by cetaceans and has been theorized to cause disorientation or acoustic trauma. Regional Stations: While the Falkland Islands lack a dense seismic network, stations in the South Sandwich Islands and South Georgia recorded "sporadic" low-frequency signals in early March 2011 that did not match standard tectonic earthquake profiles, suggesting atmospheric sources (airbursts).

The Big Event: Large Meteor Airburst. Date/Time: March 1, 2011, approximately 21:00 – 22:00 UTC. Approximate Coordinates: 30.4°S 25.5°W. Location Description: Mid-South Atlantic, roughly midway between the coast of South America and the Tristan da Cunha archipelago. Altitude of Airburst: Estimated between 30 km and 45 km. Energy Release: Calculated at approximately 0.5 to 1.1 kilotons, or 500,000 to 1,100,000 kg/TNT equivalent.

The Strandings: 2011, March 12. Falkland Islands, Speedwell Island (a remote, uninhabited island to the southwest of East Falkland). A mass stranding of an estimated 400 Long-finned pilot whales (Globicephala melas). They counted twice and both times the number was the same. A local sheep farmer, Christopher May, found the pod. He estimated they had been dead for approximately 10 days before he discovered them, which places the actual stranding date around March 2, 2011. Unusually, many of the whales were found dead and "floating" in the shallows rather than just high on the beach, which often indicates they died in the water. The pod included massive adults (20–25 feet) and very small calves (5 feet), confirming it was a complete social unit (a "nursery" or "maternity" pod). Because the island is uninhabited and has no natural land predators, the carcasses remained largely intact, though thousands of giant petrels eventually descended on the site. The unexpected feast provided food for them for several months.

2011, March (Discovered Late March). Falkland Islands, Elephant Beach, East Falkland. A mass stranding of approximately 110 long-finned pilot whales. Connection: This occurred simultaneously with the record-breaking Speedwell Island stranding above just a few miles away. The whale carcasses were estimated to be "3–4 weeks old" when found in late March places their distress signal exactly at the time of that large South Atlantic meteor airburst.

Image: Chris May