Ce Volcan Dormait Depuis l'Âge De Pierre - Maintenant Il Est Réveillé - video Dailymotion

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Imaginez un volcan qui sommeille depuis l'âge de pierre—il y a des milliers d'années—et qui se réveille maintenant ! Les scientifiques ont récemment remarqué des signes tels que des tremblements de terre grondants, de la vapeur ou de petites éruptions de ce géant autrefois en sommeil. C'est un événement majeur car les volcans en sommeil peuvent encore éclater avec fracas, et les personnes vivant à proximité pourraient être en danger. Les experts surveillent de près, utilisant des outils sophistiqués comme des satellites et des capteurs, pour prédire ce qui pourrait se passer ensuite. Bien que cela fasse peur, cela rappelle également à quel point notre planète est vivante et puissante. La nature ne suit pas un calendrier strict, elle est donc toujours pleine de surprises !  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

00:00These disturbing rumblings, the ground shaking under your feet, wait a little, it's my belly,

00:07or maybe it's Mount Adams, in the state of Washington, waking up.

00:12This is the largest volcano in this state, so much surface in volume.

00:17And it has recently started to show signs of life, after being silent for thousands

00:22of years.

00:23Scientists have noticed an alarming increase in seismic activity around the mountain.

00:28The last eruption occurred 3,800 to 7,600 years ago, humanity was still at the age of stone.

00:36This sudden locality aroused the curiosity of scientists.

00:40The American Geological Institute, or USGS, was in a hurry to set up temporary seismic stations

00:46around Mount Adams to monitor the situation.

00:49At the same time, it reassures the public by telling them that there is no need to panic.

00:54Mount Adams does not reach the height of Mount Rainier, better known.

00:57It is no less so that it covers a vast area, making it the largest active volcano in the

01:02state of Washington.

01:03It is interesting to note that before September of this year, Mount Adams had on average

01:08experienced only one small earthquake every two or three years since 1982.

01:14However, the Cascades Volcanological Observatory and the Pacific Northwest Seismic Network

01:20detected a total of six earthquakes in the space of a single month, in September.

01:25These earthquakes were all tiny, with a magnitude between 0.9 and 2 on the Richter scale.

01:33In other words, they were so weak that no one felt them on the surface.

01:38In addition, the satellite imagery confirmed that there was no deformation of the ground

01:42in the region.

01:44For the moment, the USGS maintains the alert level of Mount Adams on normal green.

01:48So we have no reason to fear that the ground will tear and swallow cities and villages.

01:53But the latest seismic shocks have encouraged the agency to install additional equipment

01:58for more precise monitoring.

02:01This extensive network will allow scientists to detect the smallest earthquakes, which

02:06will help them understand what is happening under Mount Adams.

02:10These instruments could also allow to determine whether this recent activity is an annunciator

02:15of future eruptions, or if it is simply a fortuitous anomaly.

02:20If Mount Adams erupts, it is likely that it produces slow-evolving lava flows rather

02:25than explosive eruptions like that of Mount St. Helens.

02:29After all, past eruptions have led to lava flows that spread only a few kilometers

02:34from the volcano.

02:35So this is not something to worry about.

02:38The lahars, these bubbling flows that form when volcanic ashes, rocks and melted ice

02:43mix during an eruption, are much more dangerous.

02:47Lahars have already formed near Mount Adams, even in the absence of eruptions.

02:52The rock, weakened by the hydrothermal processes at the top of the volcano, suddenly detached,

02:57creating rapid and destructive mudslides.

03:00This is precisely why the USGS ranks Mount Adams in the high-risk volcano category.

03:07Although it does not frequently erupt, it is still a serious danger to neighboring

03:11localities.

03:13The Katla, in Iceland, is another volcano to closely monitor.

03:17It is one of the most powerful and dangerous volcanoes in the country.

03:21Its last eruption dates back more than a century, in 1918.

03:25But if it erupts again, its power could be ten times greater than that of another

03:31Icelandic volcano, which I can't pronounce the name of, sorry.

03:35The latter erupted in 2010, completely disrupting air transport throughout Europe.

03:42An eruption of the Katla could release large amounts of sulfur dioxide, which could

03:46form sulfated aerosols in the atmosphere.

03:49These aerosols reflect the sun's light, which could even cause a temporary cooling

03:54of the planet.

03:55Such a phenomenon has often occurred after catastrophic volcanic eruptions in the past.

04:01Although eruptions are rare in Iceland, the Katla ash cloud would probably rise

04:06higher in the European sky and cover larger areas than that of the other volcano.

04:11It would nail planes to the ground and have negative impacts on the economy of the

04:16concerned countries.

04:17The Katla eruption would also harm agriculture, water supply and air quality.

04:24In 2014, scientists noted that a large-scale eruption could even cause a tsunami that

04:31would spread along the southern coast of Iceland and into the ocean.

04:35But the potential impact of such a tsunami is not yet clear.

04:39The Katla tends to erupt at regular intervals, every 40 to 80 years.

04:44This means that a new eruption is statistically very likely in the near future.

04:50This is why the Katla remains under close scientific surveillance.

04:55The Vieja Chamber on the Canary Islands recently erupted in 2021, reminding us of its destructive

05:01potential.

05:03The lava flow of this eruption was devastating.

05:06It covered entire neighborhoods and poured into the ocean, destroying more than 3,000

05:11houses.

05:12Thousands of people must have been evacuated.

05:14But the craziest thing?

05:16Even if the damage was significant, scientists think the situation could have been much worse.

05:22A massive eruption of the Vieja Chamber could have caused the collapse of the entire

05:27western flank of the volcano in the Atlantic Ocean, triggering a mega-tsunami.

05:32This hypothetical tsunami could have created waves several dozen, even hundreds of meters

05:37high.

05:38They could have flooded the coasts of the Atlantic Basin, including some parts of the

05:43United States and Europe.

05:45Fortunately, recent studies have shown that a collapse of this magnitude is unlikely.

05:51Even if the probability of a mega-tsunami is low, scientists think it is wise to prepare

05:57for possible eruptions, because the damage may be considerable.

06:01The lava flows that occur on this volcano tend to be important and dangerous to human

06:06life and the island's infrastructure.

06:10If you decide to go to Ecuador, you must beware of Cotopaxi, one of the most active

06:15volcanoes in the country.

06:16Since 2022, it has experienced a few minor eruptions.

06:19If these eruptions were relatively low, Cotopaxi has a high potential for major eruptions,

06:24which has put scientists on alert.

06:27If Cotopaxi erupted on a large scale, it could produce a cloud of ash over 19 kilometers

06:33high, endangering the lives of about 200,000 people in the neighboring region.

06:37The snowy top of Cotopaxi is a serious danger.

06:41It would melt very quickly in the event of a major eruption.

06:44This could lead to floods and landslides that could reach populated areas.

06:50This combination of volcanic activity and glacial flooding makes Cotopaxi a high-risk

06:55volcano.

06:56A powerful eruption could occur soon, or in several years, or even a few decades.

07:01But surveillance measures have been put in place to detect any signs of an avant-garde.

07:05The next volcano to be monitored is already sadly famous.

07:09Mount Vesuvius.

07:11Its catastrophic eruption in 1979 destroyed the Roman cities of Pompeii and Herculaneum.

07:18Its last eruption dates back to 1944.

07:22But Vesuvius remains very active and represents a major risk for Naples, one of the largest

07:27cities in Italy.

07:29A major eruption would threaten more than 3 million people.

07:33A large part of the population lives near the volcano, some even directly on its slopes.

07:39If Vesuvius erupted, we would witness an explosion of ash, rocks and gas.

07:45All ejected at extremely high speeds.

07:48Even if we do not expect such a destructive event a few hundred years from now, Vesuvius

07:53remains one of the most monitored volcanoes in the world.

07:55After all, it could cause catastrophic damage in a densely populated area.

08:01The Popocatépetl, nicknamed El Popo, is one of the most important volcanoes in North America.

08:07It is one of the highest active volcanoes in the region, located about 64 km from Mexico.

08:13This proximity with a metropolitan area of 22 million inhabitants makes the Popocatépetl

08:18particularly dangerous.

08:20A major eruption could produce a huge cloud of ash above the Mexican capital,

08:26causing widespread disruption.

08:28The ashes could obstruct the city's drainage systems, contaminate water reserves,

08:33and even cause power outages by short-circuiting electrical systems.

08:37In addition, lahars could swallow the volcano and reach neighboring cities.

08:42The Popocatépetl has had an almost constant seismic activity since the early 2000s,

08:47and small eruptions are quite frequent.

08:50At the beginning of 2024, 13 minor eruptions were recorded, which alarmed neighboring cities.

08:56However, volcanologists consider that such eruptions are normal for the Popocatépetl.

09:03If we talk about super dangerous volcanoes, we cannot ignore Yellowstone National Park.

09:09It houses one of the largest supervolcanoes in the world.

09:12Its last massive eruption occurred about 640,000 years ago.

09:16But if this monster erupted today, the impact would be much more devastating for the whole planet.

09:23The states closest to Yellowstone, including Montana, Idaho and Wyoming,

09:28would be the most affected and would probably suffer disastrous pyroclastic flows.

09:34These flows, composed of a dangerous mixture of lava, ash and gas,

09:38can destroy everything in their path.

09:41Large parts of the country would also be covered with volcanic ash, more than a meter in some regions.

09:46On a global scale, an eruption in Yellowstone would send tons of ash and gas into the stratosphere,

09:52which would risk blocking sunlight and causing global temperatures to drop for several years.

09:58This would disrupt agriculture, destroy transport systems and cause large-scale food shortages.

10:05However, if a popular myth wants Yellowstone to be close to erupting and even late,

10:11geologists say it is not true.

10:13Volcanoes do not follow a specific calendar, and the activity of the region does not indicate an imminent eruption.

10:19So this is good news.

Ce Volcan Dormait Depuis l'Âge De Pierre - Maintenant Il Est Réveillé

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