Tens of thousands of earthquakes have been recorded in Antarctica

According to the latest research, the earthquakes were most likely caused by a “column” of hot magma suspended in the Earth’s crust.

A “swarm” appeared around it, the Orca Sea Mountain, an inactive underwater volcano that rises 900 meters above the sea floor. A volcano located in the Bransfield Strait, the narrow passage between the South Shetland Islands and the northwest end of Antarctica.

In this region, the Phoenix tectonic plate “slips” under the Antarctic continental plate to form a fault zone. At the same time, some parts of the shell stretch and cracks occur in others.

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Illustration of the seismically active region off the coast of Antarctica/Cisca and others. 2022, Communications Earth & Environment / Open Access / CC BY 4.0 / public domain

Detecting an atypical phenomenon was difficult as there are only two earthquake stations nearby. The scientists used a series of data from other entities that could record the vibrations.

The two largest earthquakes in this series were recorded in October 2020 (magnitude 5.9) and November of the same year (magnitude 6.0 on the Richter scale). After the second earthquake, the seismic activity in the area weakened a lot. According to the collected survey data, para-Earth activity has been transmitted on King George Island by about 11 cm.

Only 4 percent. This displacement can be directly explained by earthquakes. Scientists suspect that the movement of magma toward the crust could be responsible for these abrupt terrestrial shifts.

“We think the 6.0-magnitude earthquake somehow caused some rifting and lowering the pressure of the magma.”

Simon Cesca, a seismologist at the German GFZ Research Center for Geosciences in Potsdam

If an underwater volcanic eruption occurred, this may have occurred at the time the strongest earthquake was recorded. To date, there is no direct evidence of a volcanic eruption. To make sure that it is huge, the shield volcano erupted its peak, scientists will have to send a special mission exactly to the strait to explore the sea floor here and compare it with historical maps.

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