The land was 9 days to shake every 90 seconds. New study suggests the true cause

A new study has just identified the true cause of the “unidentified seismic object” that in September 2023 made the earth shake every and a half minute.

For nine days, in September 2023, the world was shaken by mysterious seismic waves that were detected globally to every 90 seconds. The earth again shake the following month with an identical global signal, although it was shorter and less intense.

Perplexed with the anomalies, the investigators dubbed him “Unidentified seismic object“.

In 2024, a team of investigators suggested that this phenomenon would have been Massive Land Sliding that occurred on the fjord on September 16 and October 11, 2023, which would have 200 meters high – that no one saw.

In a new one, published this Tuesday in the magazine Nature Communications., Scientists at Oxford University in the UK now suggest a new explanation for the event.

According to the study authors, this Literally seismic event was caused by Two Mega-Tsunamis on Dickson’s fjorda narrow cove in eastern Granelândia, which were triggered by the effects of climate change caused by man.

The study is the first to directly detect the so -called “Seichas”elusive stationary waves that normally generate in estuaries and other confined bodies of water, which is essentially made the earth sound like a bell gigante.

“These seichas were triggered by megatsunamisthey themselves caused by huge landslides that dived into the fjord“, He explains Thomas Monahanresearcher at U.Oxford and first author of the study, to.

“Land slips were caused by a glacier that has been continually tuned due to climate change,” the researcher adds.

But how two megatsunamis can do With what all the earth shakes every 90 seconds?

“What made this event extraordinarily powerful, and globally, It was the geometry of the fjord“, Details Monahan.“ An accentuated curve near the output of the fjord imprisoned Seichaallowing you to reverberate for days. ”

“The repeated impacts of water against the fjord walls act as a hammer to hit the earth’s crustcreating long -term seismic waves that spread throughout the globe, ”adds the researcher.“ This unusual combination of scale, duration and geometry made the seismic sign of these regional events strong enough to be detected worldwide“.

May seem strange that an event with such global impacts has been so diverse in observational data.

Indeed, a Danish military ship was surveying the fjord during the September event and not even noticed the waves that shaken the earth in its depths.

But the moment of the two landslides coincided perfectly With the signs, leading to studies that suggested a connection.

Monahan was on vacation when she read about her studies, and was immediately intrigued. He and his colleagues had been working with observations from the Surface Water and Ocean Topography (SWOT) satellite, mission launched for space in 2022 that I had precisely the necessary to locate the waves mysterious.

“Swot provides high resolution two -dimensional measurements From the height of the sea surface, even in narrow and interior coastal waters like fjords, ”says Monahan.“ When I read about Seicha’s theory, I realized that we could really have both data and necessary tools to test it. ”

“Find the ‘Seicha no fjord’ It was super excitingbut it turned out to be the easy part – I knew where to look, ”he adds.“ The real challenge was to prove that what we saw It was, in fact, a Seicha and not anything else“.

The team Meticulously discarded other possible phenomena oceanographic and focused on the size and impact of Seicha.

The results of the study suggest that Seicha de Setembro was initially 7.9 meters highwhich released a huge force of approximately 500 Giga Newtons Against the wall of the fjord, sending ripples that were felt all over the globe.

The landslides that triggered all this noisy agitation were released by the deterioration of a glacier no name near the fjord.

The ice layers and the glaciers of Granelândia are melting at a rapid pace due to climate change caused by man, making the island the island largest contributor to rising sea level all over the world.

“The progressive deterioration of the glacier that led to this failure is almost certainly a consequence of anthropogenic climate change“, Diz Monahan.”

“If we will see more seismic signs like these is harder to say. The signs, and the seiches that produced them, were unusual, driven partly by FIORDE SINGLE GEOMETRYwhich allowed the stationary waves to form and persist, ”notes the investigator.

“In this sense, the seismic signs Act as a kind of canary In the coal mine, pointing to the occurrence of tsunamis and the underlying glacier instability that caused them, ”concludes Monahan.