Chanes, Agustín and Sánchez-Bettucci, Leda and Loureiro-Olivet, Judith and A. Castro-Artola, Oscar
(2025)
Comprehensive analysis of seismic activity on King George Island, Antarctica: insights from the September–October 2020 seismic swarm.
Advances in Polar Science, 36 (2).
pp. 113-123.
Abstract
A seismic swarm occurred southeast of King George Island, South Shetland Islands, Antarctica, between August 2020 and February 2021. This work intends to parameterize seismic events recorded by seismic station AM.R4DE2 from 15 September to 31 October 2020. Using the localization methodology with a single station, the record of the entire period was analyzed manually to determine the local magnitude, hypocentral distance, epicentral distance, backazimuth, and location of the epicenter for each event. We could parameterize 6362 events, although we estimate the occurrence to be around 20000 for the period. The results suggest a magmatic origin for the swarm, supporting previous studies. Seismicity exhibited a southeastward migration away from King George Island, as indicated by a progressive increase in epicentral distance over time. Most events were classified as volcanic and volcano-tectonic, supporting a magmatogenesis hypothesis linked to the opening of Bransfield Ridge.
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