The asteroid that wiped out the dinosaurs 66 million years ago caused a mile-high tsunami in the Gulf of Mexico, according to a study published Oct. 4 in the journal AGU Advances.
Researchers found evidence of giant tsunami This happened after analyzing samples from more than 100 areas and creating digital models of the waves caused by an asteroid impact in Mexico’s Yucatán Peninsula. According to Molly Range, research team leader in the Department of Earth and Environmental Sciences at the University of Michigan, this tsunami was powerful enough to cause disruption and erosion of sediment in the ocean basins at the other end of the world.
Simulation of an asteroid crashing into Earth.
Simulation of an asteroid crashing into Earth. (Photo: RomoloTavani)
Range studied the path of the tsunami immediately after the asteroid impact. Based on previous findings, his team modeled an asteroid 14 km wide and hurtling at a speed of 43,500 km/h, 35 times faster than the speed of sound when it hit Earth. After the asteroid appeared, many life forms perished. Non-avian dinosaurs became extinct and three-quarters of the flora and fauna were wiped out.
Researchers note many destructive impacts of asteroids, such as wildfires that burn living animals and vaporize sulfur-rich rocks, leading to acid rain and long, cold winters around the world. To learn more about tsunamis, Range and his colleagues analyzed Earth’s geology, including 120 samples of marine sediments before and after the mass extinction that marked the end of the Cretaceous. The results match the model’s predictions for wave height and propagation. The initial tsunami energy created by the collision was 30,000 times greater than the energy released by the tsunami caused by the Indian Ocean earthquake.which killed more than 230,000 people in December 2004.
As soon as it crashed on Earth, The asteroid created a crater 100 km wide, spewing thick clouds of dust and soot into the atmosphere. Just 2.5 minutes after impact, material gushed out, pushing the wall of water outward.forming a 4.5 km high wave rushing towards the shore, according to the simulation. 10 minutes later, the 1.5 km tsunami spread 220 km from the impact site, flooding the bay in all directions. An hour after impact, the tsunami left the Gulf of Mexico and flowed into the North Atlantic Ocean. Four hours later, the tsunami swept across the Central American Seaway that then separated North and South America, entering the Pacific Ocean.
The day after the asteroid impact, the wave moved across much of the Pacific and Atlantic oceans, entering the Indian Ocean on both sides, hitting most of the world’s coastal areas within 48 hours. The tsunami radiated most strongly towards the east and northeast. The water in these areas moves so quickly that it is likely to reach more than 0.6 km/h, a speed that can erode fine sediment from the seafloor.
Other areas almost escaped the impact of the tsunami, including the South Atlantic Ocean, the North Pacific Ocean and the Mediterranean Sea. The research team’s simulation shows that the water speed in the above areas is less than 0.6 km/h.
The research team even discovered rock ledges emerging from the impact on New Zealand’s North Island and South Island, more than 12,000 km away in Mexico. Initially, scientists thought they arose from local tectonic activity. But because of their age and location along the tsunami path in the model, the research team concluded that they were born from an asteroid impact.
Although it did not assess coastal flooding, the model found that waves off the Gulf of Mexico were more than 100 meters high and reached heights of more than 10 meters when they reached the northern Atlantic coast. and many places on the Pacific coast of South America.
Article source: VnExpress
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The asteroid that wiped out the dinosaurs 66 million years ago caused a kilometer-high tsunami in the Gulf of Mexico, according to a study published October 4 in the journal AGU…