8/8/2023 0 Comments Polar ice quake![]() ![]() ![]() It represents the largest seismic unrest ever recorded there," reports Simone Cesca, scientist in GFZ's Section 2.1 Earthquake and Volcano Physics and lead author of the now published study. However, in August 2020, an intense seismic swarm began there, with more than 85,000 earthquakes within half a year. "In the past, seismicity in this region was moderate. It is located in the Bransfield Strait, an ocean channel between the Antarctic Peninsula and the South Shetland Islands, southwest of the southern tip of Argentina. Orca seamount is a large submarine shield volcano with a height of about 900 metres above the sea floor and a base diameter of about 11 kilometres. The movement of fluids in the Earth's crust is therefore suspected as the cause. Swarm quakes mainly occur in volcanically active regions. The Orca volcano between the tip of South America and Antarctica With the combined application of seismological, geodetic and remote sensing techniques, they were able to determine how the rapid transfer of magma from the Earth's mantle near the crust-mantle boundary to almost the surface led to the swarm quake. Led by Simone Cesca from the German Research Centre for Geosciences (GFZ) Potsdam, researchers from Germany, Italy, Poland and the United States were involved. The fact that such events can be studied and described in great detail even in such remote and therefore poorly instrumented areas is now shown by the study of an international team published in the journal "Communications Earth and Environment". At the deep-sea volcano Orca, which has been inactive for a long time, a sequence of more than 85,000 earthquakes was registered in 2020, a swarm quake that reached proportions not previously observed for this region. Volcanoes can be found even off the coast of Antarctica. Data, Products, Services GFZ Publications.Transfer and Innovation Sustainability at GFZ Central Workshop.Collection of geoscientific experiments. ![]()
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