Les Scientifiques Ont Découvert Que De Grandes Tempêtes Peuvent Provoquer Un Phénomène Effrayant

Sympa

Saviez-vous que les tempêtes et les tremblements de terre peuvent s'associer ? Les scientifiques ont découvert un phénomène étonnant appelé sismotempêtes, où de puissantes tempêtes créent des vibrations dans l'océan qui agissent comme de petits tremblements de terre. Ces vibrations peuvent voyager à travers la Terre et même être ressenties à des kilomètres de distance ! Ce n'est pas dangereux de la même manière que les véritables séismes, mais cela reste étrange. Imaginez un ouragan remuant assez d'énergie pour faire un peu trembler la planète ! Les chercheurs sont encore en train de démêler tous les détails, mais c'est juste un rappel de plus à quel point notre monde est interconnecté—et imprévisible.  Animation créée par Sympa. ---------------------------------------------------------------------------------------- Musique par Epidemic Sound https://www.epidemicsound.com   Pour ne rien perdre de Sympa, abonnez-vous!: https://goo.gl/6E4Xna​ ---------------------------------------------------------------------------------------- Nos réseaux sociaux : Facebook: https://www.facebook.com/sympasympacom/ Instagram: https://www.instagram.com/sympa.officiel/  Stock de fichiers (photos, vidéos et autres): https://www.depositphotos.com https://www.shutterstock.com https://www.eastnews.ru ----------------------------------------------------------------------------------------  Si tu en veux encore plus, fais un tour ici:  http://sympa-sympa.com

Transcript

00:00Hurricanes can be much more frightening than we usually think,

00:04especially because they can trigger earthquakes.

00:07This surprising and terrifying phenomenon, known as the storm quake,

00:11was discovered completely by chance not so long ago.

00:15It all started when scientists tried to find out more about low-frequency earthquakes.

00:20These are earthquakes so weak that they are not noticeable.

00:25Indeed, under our feet, the Earth constantly vibrates in a subtle and non-stop way,

00:30without us being able to hear it or see it without adequate instruments.

00:34This geological storm, so to speak, is fueled by the movement of the oceans,

00:39which cover about 70% of the surface of our planet.

00:44Scientists have discovered that this storm can actually provide useful information

00:49on the evolution of our environment.

00:51To determine where it comes from, experts used seismometers.

00:56These devices are a bit like little ears applied directly to the ground.

01:00They can capture all kinds of vibrations,

01:03like those of the audience at concerts that jump from high to low in enthusiasm,

01:06planes passing in the sky or even very distant earthquakes that shake the ground.

01:12Very low-frequency earthquakes are difficult to spot over long distances,

01:17because the signals they produce can appear differently on different measuring devices.

01:21To solve this problem,

01:22experts imagined a way to track these signals by combining data from small areas,

01:28a bit like a puzzle.

01:30But in doing so, they came across a series of strange events

01:33that looked a bit like the earthquakes they were looking for and studying,

01:37but that were not exactly identical.

01:40The first strange thing they noticed was that this specific phenomenon was seasonal.

01:45It never happens between May and August, for example.

01:49It is quite different from earthquakes,

01:51which can happen at any time of the year.

01:54The second strange thing is that earthquakes occur in the United States,

01:59generally in the western part,

02:01where the ground moves along surface cracks.

02:04However, these new and strange vibrations spread not only along the west coast of North America,

02:10but also to the east.

02:12What could trigger this new phenomenon?

02:16What they discovered, and which is very surprising,

02:19is that many of these earthquakes coincided with massive storms hitting this part of the world.

02:24So it was essentially a chain reaction.

02:27During a given season,

02:29hurricanes or strong storms can transfer energy to the oceans,

02:33which creates very strong waves.

02:35These waves then interact with the ground,

02:38producing an intense seismic activity.

02:40These energy bursts, which are born from large-scale storms,

02:43can radiate over thousands of kilometers across continents,

02:47causing what is now called storm tremors.

02:51It is thought that this phenomenon can trigger magnitude earthquakes

02:55up to 3.5 on the Richter scale.

02:58This means that it can be felt by many people,

03:02but that it usually does not cause damage.

03:06This does not mean, however, that we can relax,

03:09because ocean waters can increase the intensity of hurricanes.

03:13This is what happened with the frightening Hurricane Milton,

03:16which recently devastated Florida.

03:18The purple-blue area you see is Hurricane Milton,

03:22seen from a satellite.

03:23On October 9, this hurricane blew winds of 249 km per hour

03:28and hit the region with heavy rain,

03:30devastating gusts,

03:31and potentially deadly storm waves.

03:34According to estimates,

03:36losses could rise to $34 billion,

03:39which would make it one of the most expensive storms in the history of the United States.

03:43Hurricane Milton took place in fairly complex conditions.

03:47It all started with a record heat in the Gulf of Mexico.

03:50The hot water acted like an accelerator,

03:53giving the hurricane the energy it needed to develop.

03:56And then there was also this process called eye wall renewal,

04:00which allowed it to grow.

04:02We'll come back to that in a moment.

04:04As Hurricane Milton approached the coast,

04:07something unusual happened.

04:09He crossed the path of a stream

04:11that circulates at an altitude in the atmosphere.

04:13Normally, winds in the north and northwest parts of a hurricane

04:17are not as strong as in other areas.

04:19But because of this interaction with the stream,

04:22the winds in these parts of the storm became much stronger than expected.

04:26Hurricane Milton surprised everyone,

04:29and intensified at an unparalleled speed in recent history.

04:33It threatened to hit the west coast

04:36with a dangerous wave of water,

04:38endangering the Tampa Bay region,

04:40which houses more than 3 million people.

04:44How did Milton become such a serious problem?

04:47The problem began in the east of the Pacific Ocean.

04:50Usually, hurricanes follow a fairly predictable trajectory.

04:54They leave the African coasts, cross the Atlantic,

04:57and gain power in the hot waters of the Caribbean.

05:00But Milton's story had a twist.

05:03He was born from the remains of a tropical depression

05:06that crossed the Yucatan Peninsula

05:08before meeting a front blocked in the Gulf.

05:11Once Milton set sail, he did not retreat.

05:15But when he reached the ocean's record temperatures,

05:18it was as if he had been given an energizing drink.

05:21The hot water and humid air were the perfect ingredients

05:24for a hurricane in full swing.

05:26Quickly, Milton's wind speed increased by 148 km per hour.

05:32So he left enough tropical storms

05:34to category 5 hurricanes in less than two days.

05:37Which is quite insane and out of the ordinary.

05:41As if that were not enough,

05:43Hurricane Milton also underwent a renewal of the wall of the eye.

05:47Hurricanes revolve around a generally clear eye in the center.

05:50But from one day to the next,

05:52Milton began to form new bands of rain on its outer edges,

05:56thus creating a second ring around its eye.

05:59This process allowed Milton to grow even more

06:02by distributing the speed of his winds

06:04and giving him a greater footprint.

06:06It's a bit like he was mute waiting to become even more powerful.

06:10Hurricane Milton also experienced a small oscillation in its trajectory

06:14that changed its direction.

06:16Imagine a mousetrap that is shaken

06:19and that oscillates for a moment before regaining its balance.

06:24This oscillation meant that certain regions could either be hard hit,

06:28or be spared by the worst of the storm.

06:32Fortunately, the hurricane weakened a bit

06:34due to wind changes in the atmosphere,

06:37and then it hit the ground.

06:39It then crossed the peninsula and headed for the sea,

06:42quickly losing its strength as it moved away from the hot waters.

06:46Even if the damage is important,

06:48the good news, if you can say,

06:50is that the experts expected the situation to be much worse.

06:54A question arises nevertheless.

06:55At what point was Milton's wind speed close to its maximum?

06:59In other words, is there a limit to the power of a hurricane?

07:04The answer is yes.

07:05Hurricane winds have a speed limit,

07:08but it is not a fixed number.

07:10At present, the maximum speed of a storm is about 322 km per hour.

07:15But this maximum speed can vary depending on many factors,

07:19such as the heat of the ocean.

07:21The ocean is a bit like the fuel of hurricanes.

07:24The hotter the water, the stronger the storms are.

07:29Experts think that by continuing to warm up,

07:31the oceans can increase the speed of the winds and the impact of hurricanes,

07:35which will make them much more powerful.

07:37But other factors also contribute to determining the intensity of this phenomenon.

07:41For example, you have to take into account the heat of the air

07:44and the temperature at the top of the clouds,

07:46because they influence the speed at which the heat moves

07:49from the surface of the ocean to the top of the storm.

07:53According to some estimates,

07:55the maximum speed of these winds could reach 354 km per hour by the end of the century.

08:01Experts must therefore keep an eye on this phenomenon

08:04in order to prevent future disasters.

08:07As we move forward,

08:08it is essential to continue researching and studying these storms.

08:13The more we understand them,

08:14the better we can protect ourselves and protect our communities.

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