- published: 08 Jun 2012
- views: 163579
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Subduction
In geology, subduction is the process that takes place at convergent boundaries by which one tectonic plate moves under another tectonic plate and sinks into the mantle as the plates converge. Regions where this process occurs are known as subduction zones. Rates of subduction are typically centimetres per year, with the average rate of convergence being approximately two to eight centimetres per year.
Plates include both oceanic crust and continental crust. Stable subduction zones involve the oceanic lithosphere of one plate sliding beneath the continental lithosphere or oceanic lithosphere of another plate due to the higher density of the oceanic lithosphere. That is, the subducted lithosphere is always oceanic while the over-riding lithosphere may or may not be oceanic. Subduction zones are sites that have a high rate of volcanism, earthquakes, and mountain building.
Orogenesis, or mountain-building, occurs when large pieces of material on the subducting plate (such as island arcs) are pressed into the over-riding plate or when subhorizontal contraction occurs in the over-riding plate. These areas are subject to many earthquakes, which are caused by the interactions between the subducting slab and the mantle, the volcanoes, and (when applicable) the mountain-building related to island arc collisions.
This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Subduction
Podcasts:
-
BEHIND THE SCIENCE 2011 | Subduction Zone Volcanoes
Nautilus Live website: http://nautiluslive.org Nautilus Live on Facebook: http://facebook.com/NautilusLive Explore the science behind subduction volcanoes, learn how they form, and why studying them is important.
published: 08 Jun 2012 -
The 4 Tectonic Plate Boundaries and the Hazards they Create
In this video we dive into the different types of Tectonic Plate Boundaries. Do we get Volcanoes and Earthquakes at Constructive (Divergent), Destructive (Convergent), Collision and Conservation (Transform) boundaries? Intro 0:00 - 0:27 Constructive/Divergent boundaries 0:28 - 1:47 Destructive/Convergent boundaries 1:48 - 4:13 Conservative/Transform boundaries 4:14 - 5:06 Outro 5:07 - 5:36
published: 20 May 2021 -
Subduction, stratovolcano's and explosive eruptions at convergent plate boundaries
In the previous videos you have already learned a few things about plate tectonics, the structure of the earth and divergent plate boundaries. Convergent plate boundaries will be explained in this video. If magma solidifies, new oceanic crust is formed, such as with divergent plate boundaries. This means that parts of the crust must also go back into the mantle. This happens at convergent boundaries. You have already learned that the newly formed oceanic crust cools as it moves away from the Mid-Oceanic Ridge. The density of the plate increases due to cooling. This makes the plate heavier than the underlying asthenosphere. Therefore, if the oceanic plate collides with another plate, the oceanic plate will dive into the asthenosphere. The other plate can be an oceanic plate. This will then...
published: 29 Jan 2020 -
Subduction
Subduction is the process that takes place at convergent boundaries by which one tectonic plate moves under another tectonic plate and sinks into the mantle as the plates converge. Regions where this process occurs are known as subduction zones. Rates of subduction are typically measured in centimeters per year, with the average rate of convergence being approximately 2 to 8 centimeters per year. Geology page on : Facebook https://www.facebook.com/geology.page Twitter http://twitter.com/geologypage Website : http://www.geologypage.com
published: 28 Jul 2012 -
Volcanic Arcs and Subduction
published: 18 Jul 2014 -
PLATE TECTONICS
There's a continent called Pangaea?! Well, there once was. Hundreds of millions of years ago, Earth looked completely different from how it does today. All of the land was packed into a single supercontinent. Geologist Alfred Wegener theorized that this giant landmass split into chunks and slowly drifted apart. Rejected at first by the scientific community, Wegener's theory of continental drift eventually was proved correct: The earth's crust is split up into dozens of pieces called tectonic plates, which "float" on top of the mantle. Warmed by the blazing-hot core, the mantle churns in circular convection currents, dragging tectonic plates along for the ride. Today, plate tectonics is the unifying theory of the entire field of geology. It explains the rock cycle, the origin of Earth's sur...
published: 24 Aug 2017 -
Here's EXACTLY What to Do When the Next Megaquake Hits: Cascadia Subduction Zone
PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateTerra. Subduction zone earthquakes are the largest and most destructive on earth. In 2004 a 9.1 megaquake hit Sumatra off the coast of Indonesia, unleashing a massive tsunami and killing 227,898 people. And in 2011, the Tohoku earthquake struck Japan, killing around 20,000 and triggering the infamous Fukushima nuclear disaster. In the Pacific northwest lurks the Cascadia Subduction Zone, which has been dormant for centuries and is overdue for its next “big one.” In this episode we’re going to tell you what experts think is the best way to survive this inevitable disaster. Link to Portland's Unreinforced Masonry Building map: https://projects.oregonlive.com/maps/earthquakes/unrei...
published: 18 Oct 2022 -
New discovery along the Cascadia Subduction Zone
Local scientists at the University of Washington have made an exciting discovery on the seafloor along the Cascadia Subduction Zone. The same zone capable of bringing "the big one", a 9.0 earthquake to western Washington. Subscribe to FOX 13 Seattle: https://www.youtube.com/c/fox13seattle?sub_confirmation=1 Watch FOX 13 Seattle Live: https://www.q13fox.com/live FOX 13 Seattle is Western Washington's source for breaking news, weather, traffic, politics and sports. Download the FOX 13 Seattle News App: https://q13fox.onelink.me/PeGO/7e4d2af8 Download the FOX 13 Seattle Weather App: https://jckig.app.link/dlUcXuM2Peb Subscribe to FOX 13 Seattle newsletters: https://www.q13fox.com/newsletters Follow FOX 13 Seattle on Facebook: https://www.facebook.com/fox13seattle Follow FOX 13 Seattle...
published: 19 Apr 2023 -
plate tectonics
From BBC documentary film "Earth The Power Of The Planet "
published: 03 Sep 2010 -
Subduction et formation des montagnes
Selon la théorie de la tectonique des plaques, la croûte terrestre est constituée de grandes plaques rigides d'une centaine de kilomètres d'épaisseur. Celles-ci se déplacent les unes par rapport aux autres. Lorsque deux plaques se rencontrent, elles se chevauchent et forment une zone de subduction. La plaque plongeante entraîne avec elle le bord de l'autre, formant une fosse océanique. Le chevauchement a également pour conséquence de plisser et de soulever la plaque supérieure, créant ainsi les montagnes. Les contraintes de friction sont très souvent à l'origine de séismes profonds et d'un volcanisme de type explosif.
published: 02 Sep 2020
developed with YouTube
1:56
BEHIND THE SCIENCE 2011 | Subduction Zone Volcanoes
- Order: Reorder
- Duration: 1:56
- Uploaded Date: 08 Jun 2012
- views: 163579
Nautilus Live website: http://nautiluslive.org
Nautilus Live on Facebook: http://facebook.com/NautilusLive
Explore the science behind subduction volcanoes, le...
Nautilus Live website: http://nautiluslive.org
Nautilus Live on Facebook: http://facebook.com/NautilusLive
Explore the science behind subduction volcanoes, learn how they form, and why studying them is important.
https://wn.com/Behind_The_Science_2011_|_Subduction_Zone_Volcanoes
Nautilus Live website: http://nautiluslive.org
Nautilus Live on Facebook: http://facebook.com/NautilusLive
Explore the science behind subduction volcanoes, learn how they form, and why studying them is important.
5:36
The 4 Tectonic Plate Boundaries and the Hazards they Create
- Order: Reorder
- Duration: 5:36
- Uploaded Date: 20 May 2021
- views: 636525
In this video we dive into the different types of Tectonic Plate Boundaries.
Do we get Volcanoes and Earthquakes at Constructive (Divergent), Destructive (Conv...
In this video we dive into the different types of Tectonic Plate Boundaries.
Do we get Volcanoes and Earthquakes at Constructive (Divergent), Destructive (Convergent), Collision and Conservation (Transform) boundaries?
Intro 0:00 - 0:27
Constructive/Divergent boundaries 0:28 - 1:47
Destructive/Convergent boundaries 1:48 - 4:13
Conservative/Transform boundaries 4:14 - 5:06
Outro 5:07 - 5:36
https://wn.com/The_4_Tectonic_Plate_Boundaries_And_The_Hazards_They_Create
In this video we dive into the different types of Tectonic Plate Boundaries.
Do we get Volcanoes and Earthquakes at Constructive (Divergent), Destructive (Convergent), Collision and Conservation (Transform) boundaries?
Intro 0:00 - 0:27
Constructive/Divergent boundaries 0:28 - 1:47
Destructive/Convergent boundaries 1:48 - 4:13
Conservative/Transform boundaries 4:14 - 5:06
Outro 5:07 - 5:36
- published: 20 May 2021
- views: 636525
4:52
Subduction, stratovolcano's and explosive eruptions at convergent plate boundaries
- Order: Reorder
- Duration: 4:52
- Uploaded Date: 29 Jan 2020
- views: 76364
In the previous videos you have already learned a few things about plate tectonics, the structure of the earth and divergent plate boundaries. Convergent plate ...
In the previous videos you have already learned a few things about plate tectonics, the structure of the earth and divergent plate boundaries. Convergent plate boundaries will be explained in this video.
If magma solidifies, new oceanic crust is formed, such as with divergent plate boundaries. This means that parts of the crust must also go back into the mantle. This happens at convergent boundaries. You have already learned that the newly formed oceanic crust cools as it moves away from the Mid-Oceanic Ridge. The density of the plate increases due to cooling. This makes the plate heavier than the underlying asthenosphere. Therefore, if the oceanic plate collides with another plate, the oceanic plate will dive into the asthenosphere. The other plate can be an oceanic plate. This will then be lighter and must therefore be younger. The other plate can also be a continental plate. You have already learned that a continental plate is always made of lighter material than an oceanic plate and the continental plate will therefore not dive into the heavier asthenosphere.
The diving down of the old, heavy oceanic plate is called subduction. On the border between the upper plate and the underlying oceanic plate, a deep area is created in the sea. This deep part in the sea is called a deep-sea trench, or simply trench. Along the entire plate boundary where there is subduction, there is a very long trench.
Subsequently, the hiding plate dives further into the asthenosphere. The older the plate, the heavier and steeper the plate sinks into the asthenosphere in general.
The part of the plate that sinks down pulls the rest of the plate into the asthenosphere. This force is called slab pull. The plate is pulled downwards. This force is the main cause of plate tectonics. The pacific plate is very old at the time of subduction, which causes the plate to have a high density and diving steeply in the asthenosphere. The slab pull is very strong here and the pacific plate has a relatively high speed of around 10 centimeters per year. On the west side, the Pacific plate dives below the Philippine plate. Due to the age and gravity of the Pacific plate, it dives steeply downwards, creating a trench of 11 kilometers deep!
The diving plate also carries a layer of sediment and some water towards the asthenosphere. Once the diving plate arrives in the asthenosphere, it will melt together with the sediment.
The molten mass is relatively light and rises to the crust. There the formed magma wants to burst out of the crust, which forms a volcano. Because the magma has a different composition due to the addition of sediment, this is very viscous, which is also called a viscous liquid. The viscous magma flows not far away during an eruption. The volcano is not very wide, but very high. This type of volcano is called a strato volcano.
The magma can’t escape from the volcano. Because there are also many gases in the magma, the pressure is increased. At some point there will be a violent eruption due to the increased pressure. This is an explosive eruption. There is a lot of subduction around the Pacific Ocean, so there are also many stratovolcanoes. This area is therefore called the "ring of fire": there is a ring of stratovolcanoes around the ocean.
When a stratovolcano has been emptied, the steep slopes miss the material they could lean on. That is because it has been emitted. This allows them to collapse. Such a collapsed volcano is called a caldera. Sometimes water collects in the caldera, creating a lake and sometimes the caldera lies in the sea, creating a circular island, the inside of a caldera can be full of water. The Greek island of Santorini is an example of this.
The distance from the volcano to the trench is determined by the age of the diving plate: the older the diving plate, the heavier, the steeper the plate dives down. As a result, the plate melts closer to the trench, so that the horizontal distance between the trench and volcanoes is not very large. In short: parallel to the deep-sea trench, a row of strato volcanoes is created.
Due to the convergent movement, both plates are compressed a little. The upper plate in particular can be compressed, creating hills. In South America the convergent movement has even created the second highest mountain range of the world. Incidentally, this is just an exception, because it usually only causes a hilly landscape. The unique situation of South America will be explained in another video.
In this video you have learned what subduction is, how it originates and what consequences subduction has for height differences on land and in the sea and how subduction leads to explosive volcanism. In the following video I will elaborate on a convergent movement in which only continental plates are involved.
https://wn.com/Subduction,_Stratovolcano's_And_Explosive_Eruptions_At_Convergent_Plate_Boundaries
In the previous videos you have already learned a few things about plate tectonics, the structure of the earth and divergent plate boundaries. Convergent plate boundaries will be explained in this video.
If magma solidifies, new oceanic crust is formed, such as with divergent plate boundaries. This means that parts of the crust must also go back into the mantle. This happens at convergent boundaries. You have already learned that the newly formed oceanic crust cools as it moves away from the Mid-Oceanic Ridge. The density of the plate increases due to cooling. This makes the plate heavier than the underlying asthenosphere. Therefore, if the oceanic plate collides with another plate, the oceanic plate will dive into the asthenosphere. The other plate can be an oceanic plate. This will then be lighter and must therefore be younger. The other plate can also be a continental plate. You have already learned that a continental plate is always made of lighter material than an oceanic plate and the continental plate will therefore not dive into the heavier asthenosphere.
The diving down of the old, heavy oceanic plate is called subduction. On the border between the upper plate and the underlying oceanic plate, a deep area is created in the sea. This deep part in the sea is called a deep-sea trench, or simply trench. Along the entire plate boundary where there is subduction, there is a very long trench.
Subsequently, the hiding plate dives further into the asthenosphere. The older the plate, the heavier and steeper the plate sinks into the asthenosphere in general.
The part of the plate that sinks down pulls the rest of the plate into the asthenosphere. This force is called slab pull. The plate is pulled downwards. This force is the main cause of plate tectonics. The pacific plate is very old at the time of subduction, which causes the plate to have a high density and diving steeply in the asthenosphere. The slab pull is very strong here and the pacific plate has a relatively high speed of around 10 centimeters per year. On the west side, the Pacific plate dives below the Philippine plate. Due to the age and gravity of the Pacific plate, it dives steeply downwards, creating a trench of 11 kilometers deep!
The diving plate also carries a layer of sediment and some water towards the asthenosphere. Once the diving plate arrives in the asthenosphere, it will melt together with the sediment.
The molten mass is relatively light and rises to the crust. There the formed magma wants to burst out of the crust, which forms a volcano. Because the magma has a different composition due to the addition of sediment, this is very viscous, which is also called a viscous liquid. The viscous magma flows not far away during an eruption. The volcano is not very wide, but very high. This type of volcano is called a strato volcano.
The magma can’t escape from the volcano. Because there are also many gases in the magma, the pressure is increased. At some point there will be a violent eruption due to the increased pressure. This is an explosive eruption. There is a lot of subduction around the Pacific Ocean, so there are also many stratovolcanoes. This area is therefore called the "ring of fire": there is a ring of stratovolcanoes around the ocean.
When a stratovolcano has been emptied, the steep slopes miss the material they could lean on. That is because it has been emitted. This allows them to collapse. Such a collapsed volcano is called a caldera. Sometimes water collects in the caldera, creating a lake and sometimes the caldera lies in the sea, creating a circular island, the inside of a caldera can be full of water. The Greek island of Santorini is an example of this.
The distance from the volcano to the trench is determined by the age of the diving plate: the older the diving plate, the heavier, the steeper the plate dives down. As a result, the plate melts closer to the trench, so that the horizontal distance between the trench and volcanoes is not very large. In short: parallel to the deep-sea trench, a row of strato volcanoes is created.
Due to the convergent movement, both plates are compressed a little. The upper plate in particular can be compressed, creating hills. In South America the convergent movement has even created the second highest mountain range of the world. Incidentally, this is just an exception, because it usually only causes a hilly landscape. The unique situation of South America will be explained in another video.
In this video you have learned what subduction is, how it originates and what consequences subduction has for height differences on land and in the sea and how subduction leads to explosive volcanism. In the following video I will elaborate on a convergent movement in which only continental plates are involved.
- published: 29 Jan 2020
- views: 76364
0:19
Subduction
- Order: Reorder
- Duration: 0:19
- Uploaded Date: 28 Jul 2012
- views: 63820
Subduction is the process that takes place at convergent boundaries by which one tectonic plate moves under another tectonic plate and sinks into the mantle as ...
Subduction is the process that takes place at convergent boundaries by which one tectonic plate moves under another tectonic plate and sinks into the mantle as the plates converge. Regions where this process occurs are known as subduction zones. Rates of subduction are typically measured in centimeters per year, with the average rate of convergence being approximately 2 to 8 centimeters per year.
Geology page on :
Facebook
https://www.facebook.com/geology.page
Twitter
http://twitter.com/geologypage
Website :
http://www.geologypage.com
https://wn.com/Subduction
Subduction is the process that takes place at convergent boundaries by which one tectonic plate moves under another tectonic plate and sinks into the mantle as the plates converge. Regions where this process occurs are known as subduction zones. Rates of subduction are typically measured in centimeters per year, with the average rate of convergence being approximately 2 to 8 centimeters per year.
Geology page on :
Facebook
https://www.facebook.com/geology.page
Twitter
http://twitter.com/geologypage
Website :
http://www.geologypage.com
- published: 28 Jul 2012
- views: 63820
1:29
Volcanic Arcs and Subduction
- Order: Reorder
- Duration: 1:29
- Uploaded Date: 18 Jul 2014
- views: 147674
- published: 18 Jul 2014
- views: 147674
7:09
PLATE TECTONICS
- Order: Reorder
- Duration: 7:09
- Uploaded Date: 24 Aug 2017
- views: 3654419
There's a continent called Pangaea?! Well, there once was. Hundreds of millions of years ago, Earth looked completely different from how it does today. All of t...
There's a continent called Pangaea?! Well, there once was. Hundreds of millions of years ago, Earth looked completely different from how it does today. All of the land was packed into a single supercontinent. Geologist Alfred Wegener theorized that this giant landmass split into chunks and slowly drifted apart. Rejected at first by the scientific community, Wegener's theory of continental drift eventually was proved correct: The earth's crust is split up into dozens of pieces called tectonic plates, which "float" on top of the mantle. Warmed by the blazing-hot core, the mantle churns in circular convection currents, dragging tectonic plates along for the ride. Today, plate tectonics is the unifying theory of the entire field of geology. It explains the rock cycle, the origin of Earth's surface features, and the cause of seismic activity, such as earthquakes and volcanoes. Get the drift? Watch this movie to learn more!
https://wn.com/Plate_Tectonics
There's a continent called Pangaea?! Well, there once was. Hundreds of millions of years ago, Earth looked completely different from how it does today. All of the land was packed into a single supercontinent. Geologist Alfred Wegener theorized that this giant landmass split into chunks and slowly drifted apart. Rejected at first by the scientific community, Wegener's theory of continental drift eventually was proved correct: The earth's crust is split up into dozens of pieces called tectonic plates, which "float" on top of the mantle. Warmed by the blazing-hot core, the mantle churns in circular convection currents, dragging tectonic plates along for the ride. Today, plate tectonics is the unifying theory of the entire field of geology. It explains the rock cycle, the origin of Earth's surface features, and the cause of seismic activity, such as earthquakes and volcanoes. Get the drift? Watch this movie to learn more!
- published: 24 Aug 2017
- views: 3654419
12:13
Here's EXACTLY What to Do When the Next Megaquake Hits: Cascadia Subduction Zone
- Order: Reorder
- Duration: 12:13
- Uploaded Date: 18 Oct 2022
- views: 2445576
PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateTerra.
Subduction zone earthquakes are the largest...
PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateTerra.
Subduction zone earthquakes are the largest and most destructive on earth. In 2004 a 9.1 megaquake hit Sumatra off the coast of Indonesia, unleashing a massive tsunami and killing 227,898 people. And in 2011, the Tohoku earthquake struck Japan, killing around 20,000 and triggering the infamous Fukushima nuclear disaster. In the Pacific northwest lurks the Cascadia Subduction Zone, which has been dormant for centuries and is overdue for its next “big one.”
In this episode we’re going to tell you what experts think is the best way to survive this inevitable disaster.
Link to Portland's Unreinforced Masonry Building map: https://projects.oregonlive.com/maps/earthquakes/unreinforced-masonry
Weathered is a show hosted by weather expert Maiya May and produced by Balance Media that helps explain the most common natural disasters, what causes them, how they’re changing, and what we can do to prepare.
Subscribe to PBS Terra so you never miss an episode! https://bit.ly/3mOfd77
And keep up with Weathered and PBS Terra on:
Facebook: https://www.facebook.com/PBSDigitalSt...
Twitter: https://twitter.com/pbsds
Instagram: https://www.instagram.com/pbsds
https://wn.com/Here's_Exactly_What_To_Do_When_The_Next_Megaquake_Hits_Cascadia_Subduction_Zone
PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateTerra.
Subduction zone earthquakes are the largest and most destructive on earth. In 2004 a 9.1 megaquake hit Sumatra off the coast of Indonesia, unleashing a massive tsunami and killing 227,898 people. And in 2011, the Tohoku earthquake struck Japan, killing around 20,000 and triggering the infamous Fukushima nuclear disaster. In the Pacific northwest lurks the Cascadia Subduction Zone, which has been dormant for centuries and is overdue for its next “big one.”
In this episode we’re going to tell you what experts think is the best way to survive this inevitable disaster.
Link to Portland's Unreinforced Masonry Building map: https://projects.oregonlive.com/maps/earthquakes/unreinforced-masonry
Weathered is a show hosted by weather expert Maiya May and produced by Balance Media that helps explain the most common natural disasters, what causes them, how they’re changing, and what we can do to prepare.
Subscribe to PBS Terra so you never miss an episode! https://bit.ly/3mOfd77
And keep up with Weathered and PBS Terra on:
Facebook: https://www.facebook.com/PBSDigitalSt...
Twitter: https://twitter.com/pbsds
Instagram: https://www.instagram.com/pbsds
- published: 18 Oct 2022
- views: 2445576
2:04
New discovery along the Cascadia Subduction Zone
- Order: Reorder
- Duration: 2:04
- Uploaded Date: 19 Apr 2023
- views: 357805
Local scientists at the University of Washington have made an exciting discovery on the seafloor along the Cascadia Subduction Zone. The same zone capable of br...
Local scientists at the University of Washington have made an exciting discovery on the seafloor along the Cascadia Subduction Zone. The same zone capable of bringing "the big one", a 9.0 earthquake to western Washington.
Subscribe to FOX 13 Seattle: https://www.youtube.com/c/fox13seattle?sub_confirmation=1
Watch FOX 13 Seattle Live: https://www.q13fox.com/live
FOX 13 Seattle is Western Washington's source for breaking news, weather, traffic, politics and sports.
Download the FOX 13 Seattle News App: https://q13fox.onelink.me/PeGO/7e4d2af8
Download the FOX 13 Seattle Weather App: https://jckig.app.link/dlUcXuM2Peb
Subscribe to FOX 13 Seattle newsletters: https://www.q13fox.com/newsletters
Follow FOX 13 Seattle on Facebook: https://www.facebook.com/fox13seattle
Follow FOX 13 Seattle on TikTok: https://www.tiktok.com/@fox13seattle
Follow FOX 13 Seattle on Instagram: https://www.instagram.com/fox13seattle
Follow FOX 13 Seattle on Twitter: https://twitter.com/fox13seattle
https://wn.com/New_Discovery_Along_The_Cascadia_Subduction_Zone
Local scientists at the University of Washington have made an exciting discovery on the seafloor along the Cascadia Subduction Zone. The same zone capable of bringing "the big one", a 9.0 earthquake to western Washington.
Subscribe to FOX 13 Seattle: https://www.youtube.com/c/fox13seattle?sub_confirmation=1
Watch FOX 13 Seattle Live: https://www.q13fox.com/live
FOX 13 Seattle is Western Washington's source for breaking news, weather, traffic, politics and sports.
Download the FOX 13 Seattle News App: https://q13fox.onelink.me/PeGO/7e4d2af8
Download the FOX 13 Seattle Weather App: https://jckig.app.link/dlUcXuM2Peb
Subscribe to FOX 13 Seattle newsletters: https://www.q13fox.com/newsletters
Follow FOX 13 Seattle on Facebook: https://www.facebook.com/fox13seattle
Follow FOX 13 Seattle on TikTok: https://www.tiktok.com/@fox13seattle
Follow FOX 13 Seattle on Instagram: https://www.instagram.com/fox13seattle
Follow FOX 13 Seattle on Twitter: https://twitter.com/fox13seattle
- published: 19 Apr 2023
- views: 357805
1:14
plate tectonics
- Order: Reorder
- Duration: 1:14
- Uploaded Date: 03 Sep 2010
- views: 4753252
From BBC documentary film "Earth The Power Of The Planet "
From BBC documentary film "Earth The Power Of The Planet "
https://wn.com/Plate_Tectonics
From BBC documentary film "Earth The Power Of The Planet "
- published: 03 Sep 2010
- views: 4753252
1:03
Subduction et formation des montagnes
- Order: Reorder
- Duration: 1:03
- Uploaded Date: 02 Sep 2020
- views: 83403
Selon la théorie de la tectonique des plaques, la croûte terrestre est constituée de grandes plaques rigides d'une centaine de kilomètres d'épaisseur. Celles-ci...
Selon la théorie de la tectonique des plaques, la croûte terrestre est constituée de grandes plaques rigides d'une centaine de kilomètres d'épaisseur. Celles-ci se déplacent les unes par rapport aux autres. Lorsque deux plaques se rencontrent, elles se chevauchent et forment une zone de subduction. La plaque plongeante entraîne avec elle le bord de l'autre, formant une fosse océanique. Le chevauchement a également pour conséquence de plisser et de soulever la plaque supérieure, créant ainsi les montagnes. Les contraintes de friction sont très souvent à l'origine de séismes profonds et d'un volcanisme de type explosif.
https://wn.com/Subduction_Et_Formation_Des_Montagnes
Selon la théorie de la tectonique des plaques, la croûte terrestre est constituée de grandes plaques rigides d'une centaine de kilomètres d'épaisseur. Celles-ci se déplacent les unes par rapport aux autres. Lorsque deux plaques se rencontrent, elles se chevauchent et forment une zone de subduction. La plaque plongeante entraîne avec elle le bord de l'autre, formant une fosse océanique. Le chevauchement a également pour conséquence de plisser et de soulever la plaque supérieure, créant ainsi les montagnes. Les contraintes de friction sont très souvent à l'origine de séismes profonds et d'un volcanisme de type explosif.
- published: 02 Sep 2020
- views: 83403
1:56
BEHIND THE SCIENCE 2011 | Subduction Zone Volcanoes
Nautilus Live website: http://nautiluslive.org
Nautilus Live on Facebook: http://facebook....
published: 08 Jun 2012
BEHIND THE SCIENCE 2011 | Subduction Zone Volcanoes
BEHIND THE SCIENCE 2011 | Subduction Zone Volcanoes
- Report rights infringement
- published: 08 Jun 2012
- views: 163579
Nautilus Live website: http://nautiluslive.org
Nautilus Live on Facebook: http://facebook.com/NautilusLive
Explore the science behind subduction volcanoes, learn how they form, and why studying them is important.
5:36
The 4 Tectonic Plate Boundaries and the Hazards they Create
In this video we dive into the different types of Tectonic Plate Boundaries.
Do we get Vo...
published: 20 May 2021
The 4 Tectonic Plate Boundaries and the Hazards they Create
The 4 Tectonic Plate Boundaries and the Hazards they Create
- Report rights infringement
- published: 20 May 2021
- views: 636525
In this video we dive into the different types of Tectonic Plate Boundaries.
Do we get Volcanoes and Earthquakes at Constructive (Divergent), Destructive (Convergent), Collision and Conservation (Transform) boundaries?
Intro 0:00 - 0:27
Constructive/Divergent boundaries 0:28 - 1:47
Destructive/Convergent boundaries 1:48 - 4:13
Conservative/Transform boundaries 4:14 - 5:06
Outro 5:07 - 5:36
4:52
Subduction, stratovolcano's and explosive eruptions at convergent plate boundaries
In the previous videos you have already learned a few things about plate tectonics, the st...
published: 29 Jan 2020
Subduction, stratovolcano's and explosive eruptions at convergent plate boundaries
Subduction, stratovolcano's and explosive eruptions at convergent plate boundaries
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- published: 29 Jan 2020
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In the previous videos you have already learned a few things about plate tectonics, the structure of the earth and divergent plate boundaries. Convergent plate boundaries will be explained in this video.
If magma solidifies, new oceanic crust is formed, such as with divergent plate boundaries. This means that parts of the crust must also go back into the mantle. This happens at convergent boundaries. You have already learned that the newly formed oceanic crust cools as it moves away from the Mid-Oceanic Ridge. The density of the plate increases due to cooling. This makes the plate heavier than the underlying asthenosphere. Therefore, if the oceanic plate collides with another plate, the oceanic plate will dive into the asthenosphere. The other plate can be an oceanic plate. This will then be lighter and must therefore be younger. The other plate can also be a continental plate. You have already learned that a continental plate is always made of lighter material than an oceanic plate and the continental plate will therefore not dive into the heavier asthenosphere.
The diving down of the old, heavy oceanic plate is called subduction. On the border between the upper plate and the underlying oceanic plate, a deep area is created in the sea. This deep part in the sea is called a deep-sea trench, or simply trench. Along the entire plate boundary where there is subduction, there is a very long trench.
Subsequently, the hiding plate dives further into the asthenosphere. The older the plate, the heavier and steeper the plate sinks into the asthenosphere in general.
The part of the plate that sinks down pulls the rest of the plate into the asthenosphere. This force is called slab pull. The plate is pulled downwards. This force is the main cause of plate tectonics. The pacific plate is very old at the time of subduction, which causes the plate to have a high density and diving steeply in the asthenosphere. The slab pull is very strong here and the pacific plate has a relatively high speed of around 10 centimeters per year. On the west side, the Pacific plate dives below the Philippine plate. Due to the age and gravity of the Pacific plate, it dives steeply downwards, creating a trench of 11 kilometers deep!
The diving plate also carries a layer of sediment and some water towards the asthenosphere. Once the diving plate arrives in the asthenosphere, it will melt together with the sediment.
The molten mass is relatively light and rises to the crust. There the formed magma wants to burst out of the crust, which forms a volcano. Because the magma has a different composition due to the addition of sediment, this is very viscous, which is also called a viscous liquid. The viscous magma flows not far away during an eruption. The volcano is not very wide, but very high. This type of volcano is called a strato volcano.
The magma can’t escape from the volcano. Because there are also many gases in the magma, the pressure is increased. At some point there will be a violent eruption due to the increased pressure. This is an explosive eruption. There is a lot of subduction around the Pacific Ocean, so there are also many stratovolcanoes. This area is therefore called the "ring of fire": there is a ring of stratovolcanoes around the ocean.
When a stratovolcano has been emptied, the steep slopes miss the material they could lean on. That is because it has been emitted. This allows them to collapse. Such a collapsed volcano is called a caldera. Sometimes water collects in the caldera, creating a lake and sometimes the caldera lies in the sea, creating a circular island, the inside of a caldera can be full of water. The Greek island of Santorini is an example of this.
The distance from the volcano to the trench is determined by the age of the diving plate: the older the diving plate, the heavier, the steeper the plate dives down. As a result, the plate melts closer to the trench, so that the horizontal distance between the trench and volcanoes is not very large. In short: parallel to the deep-sea trench, a row of strato volcanoes is created.
Due to the convergent movement, both plates are compressed a little. The upper plate in particular can be compressed, creating hills. In South America the convergent movement has even created the second highest mountain range of the world. Incidentally, this is just an exception, because it usually only causes a hilly landscape. The unique situation of South America will be explained in another video.
In this video you have learned what subduction is, how it originates and what consequences subduction has for height differences on land and in the sea and how subduction leads to explosive volcanism. In the following video I will elaborate on a convergent movement in which only continental plates are involved.
0:19
Subduction
Subduction is the process that takes place at convergent boundaries by which one tectonic ...
published: 28 Jul 2012
Subduction
Subduction
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- published: 28 Jul 2012
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Subduction is the process that takes place at convergent boundaries by which one tectonic plate moves under another tectonic plate and sinks into the mantle as the plates converge. Regions where this process occurs are known as subduction zones. Rates of subduction are typically measured in centimeters per year, with the average rate of convergence being approximately 2 to 8 centimeters per year.
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1:29
Volcanic Arcs and Subduction
published: 18 Jul 2014
Volcanic Arcs and Subduction
Volcanic Arcs and Subduction
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- published: 18 Jul 2014
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7:09
PLATE TECTONICS
There's a continent called Pangaea?! Well, there once was. Hundreds of millions of years a...
published: 24 Aug 2017
PLATE TECTONICS
PLATE TECTONICS
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- published: 24 Aug 2017
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There's a continent called Pangaea?! Well, there once was. Hundreds of millions of years ago, Earth looked completely different from how it does today. All of the land was packed into a single supercontinent. Geologist Alfred Wegener theorized that this giant landmass split into chunks and slowly drifted apart. Rejected at first by the scientific community, Wegener's theory of continental drift eventually was proved correct: The earth's crust is split up into dozens of pieces called tectonic plates, which "float" on top of the mantle. Warmed by the blazing-hot core, the mantle churns in circular convection currents, dragging tectonic plates along for the ride. Today, plate tectonics is the unifying theory of the entire field of geology. It explains the rock cycle, the origin of Earth's surface features, and the cause of seismic activity, such as earthquakes and volcanoes. Get the drift? Watch this movie to learn more!
12:13
Here's EXACTLY What to Do When the Next Megaquake Hits: Cascadia Subduction Zone
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published: 18 Oct 2022
Here's EXACTLY What to Do When the Next Megaquake Hits: Cascadia Subduction Zone
Here's EXACTLY What to Do When the Next Megaquake Hits: Cascadia Subduction Zone
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- published: 18 Oct 2022
- views: 2445576
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Subduction zone earthquakes are the largest and most destructive on earth. In 2004 a 9.1 megaquake hit Sumatra off the coast of Indonesia, unleashing a massive tsunami and killing 227,898 people. And in 2011, the Tohoku earthquake struck Japan, killing around 20,000 and triggering the infamous Fukushima nuclear disaster. In the Pacific northwest lurks the Cascadia Subduction Zone, which has been dormant for centuries and is overdue for its next “big one.”
In this episode we’re going to tell you what experts think is the best way to survive this inevitable disaster.
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2:04
New discovery along the Cascadia Subduction Zone
Local scientists at the University of Washington have made an exciting discovery on the se...
published: 19 Apr 2023
New discovery along the Cascadia Subduction Zone
New discovery along the Cascadia Subduction Zone
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- published: 19 Apr 2023
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Local scientists at the University of Washington have made an exciting discovery on the seafloor along the Cascadia Subduction Zone. The same zone capable of bringing "the big one", a 9.0 earthquake to western Washington.
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1:14
plate tectonics
From BBC documentary film "Earth The Power Of The Planet "
published: 03 Sep 2010
plate tectonics
plate tectonics
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- published: 03 Sep 2010
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From BBC documentary film "Earth The Power Of The Planet "
1:03
Subduction et formation des montagnes
Selon la théorie de la tectonique des plaques, la croûte terrestre est constituée de grand...
published: 02 Sep 2020
Subduction et formation des montagnes
Subduction et formation des montagnes
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- published: 02 Sep 2020
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Selon la théorie de la tectonique des plaques, la croûte terrestre est constituée de grandes plaques rigides d'une centaine de kilomètres d'épaisseur. Celles-ci se déplacent les unes par rapport aux autres. Lorsque deux plaques se rencontrent, elles se chevauchent et forment une zone de subduction. La plaque plongeante entraîne avec elle le bord de l'autre, formant une fosse océanique. Le chevauchement a également pour conséquence de plisser et de soulever la plaque supérieure, créant ainsi les montagnes. Les contraintes de friction sont très souvent à l'origine de séismes profonds et d'un volcanisme de type explosif.
Subduction
In geology, subduction is the process that takes place at convergent boundaries by which one tectonic plate moves under another tectonic plate and sinks into the mantle as the plates converge. Regions where this process occurs are known as subduction zones. Rates of subduction are typically centimetres per year, with the average rate of convergence being approximately two to eight centimetres per year.
Plates include both oceanic crust and continental crust. Stable subduction zones involve the oceanic lithosphere of one plate sliding beneath the continental lithosphere or oceanic lithosphere of another plate due to the higher density of the oceanic lithosphere. That is, the subducted lithosphere is always oceanic while the over-riding lithosphere may or may not be oceanic. Subduction zones are sites that have a high rate of volcanism, earthquakes, and mountain building.
Orogenesis, or mountain-building, occurs when large pieces of material on the subducting plate (such as island arcs) are pressed into the over-riding plate or when subhorizontal contraction occurs in the over-riding plate. These areas are subject to many earthquakes, which are caused by the interactions between the subducting slab and the mantle, the volcanoes, and (when applicable) the mountain-building related to island arc collisions.
This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Subduction
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