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Scientists from the Instituto Dom Luiz and IPMA uncover the phenomenon that caused the global spread of the tsunami in Tonga.

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The atmospheric acoustic gravity wave caused by the massive explosion of the Hunga Tonga-Hunga Ha’apai volcano in the South Pacific on January 15 was the source of a global tsunami. The conclusion was made by a team of researchers from the Dom Luis Institute, the Faculty of Natural Sciences of the University of Lisbon and the Portuguese Institute of the Sea and Atmosphere (IPMA).

Using a combination of sea level data, atmospheric and satellite images from various parts of the globe, to which they applied numerical and analytical models, the scientists demonstrated that “the tsunami was caused by a constantly moving source in which acoustic gravity waves were emitted. eruptions excite the ocean and transfer energy to it through resonance, ”says a study published in the journal Nature under the title “Global tsunami in Tonga attributed to fast moving atmospheric source”.

The coincidence between the tsunami and the time of arrival of these acoustic-gravity waves confirms, according to the researchers, the existence of a direct connection between these two phenomena. “The massive volcanic explosion created noticeable atmospheric waves and an exceptionally fast global tsunami,” comments lead author Rashid Omira, researcher at Instituto Dom Luiz and IPMA.

The geophysicist cites as an example the fact that the tsunami hit the coast of Portugal, on the opposite side of the planet (more than 17 thousand kilometers), “ten hours earlier than expected”, crossing the oceans and causing sea waves of amazing sizes. , has remote areas.

“This was the first time that a tsunami caused by a volcanic eruption was recorded on a global scale with modern and dense equipment around the world, which provided a unique opportunity to study the processes of interaction between air and water during its occurrence and propagation,” says Omira.

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Volcanic eruptions usually cause tsunamis but are now less likely to have transoceanic effects. In Portugal, according to IPMA information released at the time, “sea level changes” were observed in the Azores, Madeira and the mainland. In Ponta Delgada, the water level rose by 40 cm, in Peniche by 39 cm, and in Funchal by 20 cm.

“This tsunami spread across different oceans, including the Atlantic, while sea level fluctuations were observed at almost all mareographic stations operating on the Portuguese coast, fluctuations with an amplitude of less than half a meter,” IPMA then said.

The eruption of an underwater volcano a few kilometers from Tonga raised a cloud of ash and gases into the sky, reaching a height of 20 kilometers. Tsunami waves damaged New Zealand, Chile, Peru and the United States.

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How the United States unsuccessfully tried to convince the Europeans and Zelensky of the inevitability of an invasion | War in Ukraine

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In the months leading up to the Russian invasion of Ukraine on February 24, the United States never ceased to publicly warn of the possibility of a large-scale Russian intervention—at one point, the Ukrainian government itself asked Washington “not to provoke a panic.” As the newspaper now shows Washington PostThe White House knew about the invasion plan months before Vladimir Putin’s order, but failed to convince NATO members that an attack was imminent.

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The Prime Minister of Finland danced at a private party, and the opposition does not forgive it | celebrities

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Finland’s prime minister is back in the spotlight this week, again for reasons other than her leadership style. In a video posted on social media, Sanna Marin dances and sings with a group of friends. As a result, opposition party leaders are demanding that the 36-year-old government official undergo a drug test, and argue that such an attitude is not appropriate for a government official.

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Suitcases containing the remains of two children sold at auction in New Zealand

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New Zealand police said the remains of two children were found in suitcases bought at an auction in Auckland, New Zealand’s largest city.

Inspector Tofilau Faamanuia Waaelua said that the bodies of the victims, aged between five and ten years, were probably hidden for several years in two suitcases of the same size.

“The nature of the discovery makes the investigation challenging, especially given the time that has elapsed between death and discovery,” Waaelua said.

The family found the bags after purchasing a trailer full of items sold in bulk from a warehouse, with an official stating that the family in question was unrelated to the death but “understandably distraught at the find.”

Police, who also called Interpol, are searching the trailer for other household items and personal items to identify the victims.

The warehouse and property where the bags were found were thoroughly inspected by a forensic team.

“We are doing our best to identify the victims” in order to bring to justice the perpetrator or perpetrators of the deaths of these children, Waaelua said.

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