Un méga-tsunami massif de 650 pieds a frappé le Groenland après un énorme glissement de terrain rocheux dans un fjord, et cela a secoué la Terre ! Ce n'était pas votre vague habituelle - elle a été causée par un gros morceau de roche s'écrasant dans l'eau. La force a envoyé un mur d'eau massif se précipiter à travers le fjord, engloutissant tout sur son passage. C'était tellement puissant que les scientifiques l'ont enregistré comme un événement majeur. Heureusement, ces types de tsunamis sont rares, mais lorsqu'ils se produisent, ils peuvent être dévastateurs. Imaginez une vague aussi haute qu'un immeuble se précipitant vers vous - c'est la puissance de la nature dans toute sa sauvagerie ! 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
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00:00On September 16th, 2023, without warning, the Earth began to shake.
00:10A low and strange vibration that hit the Earth's crust.
00:14This triggered all the seismic alarms on the planet.
00:18For nine days in a row, the Earth vibrated at a frightening rate,
00:22and scientists had no idea what was going on.
00:26During this time, in Greenland, it was a total disaster.
00:34It was not an earthquake.
00:36That, they knew.
00:38This particular rhythm told them.
00:40We live on giant tectonic plates,
00:43and they constantly move by sliding on the magma like icebergs on the ocean.
00:47Sometimes, by moving like this, they rub against each other,
00:51collide, or break.
00:54And all this causes incredible discharge of energy,
00:57which sends shock waves through the ground.
00:59It is at this moment that we feel the Earth shaking,
01:01and this is what we call an earthquake.
01:03These vibrations are called seismic waves.
01:06Seismometers perceive them as a rumbling.
01:09During a typical earthquake,
01:11these waves create a whole bunch of different frequencies.
01:14It is a chaotic mixture of low and high frequencies,
01:17as if you were pressing all the keys of a piano at the same time.
01:21But what is strange in the case of the earthquake in Greenland,
01:24is that the signals were not at all of the same type.
01:27It was a regular vibration at a unique frequency,
01:30as if a machine was vibrating under the ground,
01:33as if a piano key was being hit again and again,
01:36creating a repetitive and disturbing sound.
01:39It turned out that what they heard was not the noise
01:42that the tectonic plates make when they break.
01:45It was a phenomenon that seismologists had never observed before.
01:49Days went by,
01:51and the mysterious noise did not stop.
01:54Vibrations occurred every 90 seconds,
01:57and resonated throughout the world.
01:59Seismologists were increasingly desperate.
02:02They had absolutely no idea what they were dealing with.
02:05They had to bring together a vast international team
02:08made up of 68 specialists from 15 different countries.
02:12For several days,
02:14all these scientists would collect seismic data,
02:17satellite images, and make complex calculations.
02:20Until they finally found the culprit.
02:23It was water.
02:25The problem came from an isolated and deserted region
02:28in eastern Greenland.
02:30This place is full of fjords,
02:32narrow sea arms,
02:34located between high cliffs,
02:36deep valleys filled with water,
02:38and surrounded by imposing rocky walls.
02:40In this region,
02:42located in the middle of steep peaks and glacial water,
02:44the air is calm.
02:46The landscape seems frozen in time.
02:48Nothing has changed for years,
02:50until the day when...
02:54A colossal landslide occurred in the Dixon Fjord.
02:58One of the steep mountain slopes
03:00overlooking the fjord at an altitude of 1,220 meters
03:03collapsed in a gigantic quake.
03:05Imagine a huge piece of mountain
03:07breaking and crashing into the fjord.
03:11A deluge of rocks and ice fell on the water.
03:14The impact was simply apocalyptic.
03:1725 million cubic meters of debris.
03:19That's enough ice and rocks
03:21to fill 10,000 Olympic pools
03:23or 10 large Giza pyramids.
03:25And all this matter was projected into the water
03:28with such force
03:30that it resulted in a tsunami of 110 meters high,
03:33higher than the Statue of Liberty.
03:35But the craziest thing is that this incredibly powerful wave
03:38was stuck between the narrow cliffs of the fjord
03:41and it couldn't escape.
03:43It was a bit like water
03:45violently shaking in a bathtub.
03:47For nine days,
03:49the mega-tsunami continued to shake
03:51a path through the fjord.
03:53That's why we heard this continuous rumbling.
03:56It was the rhythmic wave of the water
03:58cracking against the walls.
04:00The shock waves spread
04:02into the depths of the earth's crust.
04:04Vibrations so powerful
04:06that they were captured by seismometers
04:08from all over the world.
04:10This phenomenon was so rare,
04:12so unprecedented,
04:14that scientists were stunned.
04:16It was a perfect combination of elements.
04:19A glacier weakened by years of warming
04:22no longer had the strength to bear
04:24the weight of the mountain above it.
04:30The collapse was inevitable
04:32and chaos literally shook the earth.
04:35There are often people in this area,
04:37in cruise ships for example.
04:39Another chance that no one
04:41has lost their life in this disaster.
04:43But it didn't take long.
04:45A tourist boat,
04:47failed in the region two days earlier,
04:49managed to escape the tsunami
04:51by the greatest chance.
04:53That doesn't mean there were no losses.
04:55The waves destroyed an inhuman site
04:57located nearby.
04:59It had remained intact for more than 200 years.
05:02They also took the shelters
05:04of a research station
05:06located 70 km away.
05:08The vibrations traveled from Greenland
05:10to the South Pole in less than an hour.
05:12This shows how dangerous
05:14such events can be.
05:19And this is not the only place
05:21where such catastrophes occur.
05:23In the beautiful Californian community
05:25of Rancho Palos Verdes,
05:27the ground moves so fast
05:29that it overwhelms the houses.
05:31The ground has always been quite unstable
05:33in this region.
05:35Its geology is unique.
05:37It rests on a furniture floor,
05:39rich in clay,
05:41and is on a fault line,
05:43which makes it prone to landslides.
05:45This means that this area
05:47is exposed to slow underground movements
05:49that spread over years and years,
05:51even in the absence of exceptional
05:53meteorological phenomena.
05:55It has been so for decades,
05:57but the movement is generally slow
06:00Imagine that you found a tree
06:02near which you played
06:04when you were children,
06:066 meters from its original location.
06:08For decades, the inhabitants adapted.
06:10They built their houses
06:12on adjustable beams.
06:14This allowed the inhabitants
06:16to move with the ground.
06:18This strategy has worked well
06:20until today.
06:22Recently, the situation
06:24has deteriorated significantly
06:26in the community.
06:28It is currently 0.3 meters per week.
06:30It is as if your tree
06:32had moved 290 meters
06:34since your childhood.
06:36The last two years have also been marked
06:38by heavy rains,
06:40and the weather has degraded.
06:42This has increased the ground's water hold.
06:44The ground has become heavier
06:46and more prone to rapid movements.
06:48Today, this idyllic place
06:50by the sea has turned
06:52into a sinister area.
06:54Cracks have appeared in the cupboards,
06:56gardens and roads,
06:58growing day by day.
07:00The streets are now distorted
07:02and the landscape looks like
07:04a delusional amusement park.
07:06The houses that were still standing
07:08have been torn from their foundations,
07:10some even cut in half.
07:12The door of a house
07:14was raised 2.5 meters from the ground.
07:16Entire neighborhoods were plunged into chaos.
07:18Public services had to cut
07:20the gas and electricity
07:22for an indefinite period
07:24of possible catastrophes.
07:28The Portuguese Bend neighborhood
07:30is the hardest hit.
07:32Its inhabitants live literally
07:34on the edge of the gulf.
07:36This neighborhood has always benefited
07:38from an impregnable view of the ocean
07:40and a pleasant sea breeze.
07:42Horses and bridges walked
07:44in these streets lined with trees.
07:46But today, it is as if
07:48an earthquake had occurred.
07:50Except that this time,
07:52only if the earth stopped moving
07:54under their feet.
07:56So the inhabitants do not give up.
07:58Some had to leave,
08:00but many are determined
08:02to stay and fight
08:04despite the immense damage.
08:06However, saving their property
08:08costs them hundreds of thousands of dollars.
08:10They installed generators
08:12to get light
08:14and set up sewage systems
08:16and pumps to drain groundwater
08:18due to landslides.
08:20They also installed
08:22independent power plants
08:24to store energy.
08:26The inhabitants do everything
08:28they can to operate
08:30their sewage systems
08:32with generators.
08:34They hope to be able
08:36to evacuate all the water
08:38from these infernal landslides.
08:40They are determined to fight,
08:42but they will need the help
08:44and support of the government
08:46to fight this disaster.
08:48In the United States,
08:50we do not usually think about it.
08:52New maps and data show
08:54that thousands of people
08:56could be in danger.
08:58Scientists have managed
09:00to create the first detailed map
09:02indicating where these landslides
09:04could occur in the future,
09:06count by count.
09:08This map is based on numerous statistics
09:10and on more than a million incidents
09:12that have occurred in the past.
09:14According to this map,
09:16thousands of people could suffer landslides,
09:18which could lead to
09:20unforeseen disasters in certain regions.
09:22Fortunately, the inhabitants
09:24and engineers now have solid
09:26information at their disposal.
09:28But all this shows
09:30how vulnerable we are
09:32to natural disasters
09:34and how important it is
09:36to always remain vigilant.