Seismic waves are waves of energy that travel through the Earth's layers, and are a result of an earthquake, explosion, or a volcano that gives out low-frequency acoustic energy. Many other natural and anthropogenic sources create low-amplitude waves commonly referred to as ambient vibrations. Seismic waves are studied by geophysicists called seismologists. Seismic wave fields are recorded by a seismometer, hydrophone (in water), or accelerometer.
The propagation velocity of the waves depends on density and elasticity of the medium. Velocity tends to increase with depth and ranges from approximately 2 to 8km/s in the Earth's crust, up to 13km/s in the deep mantle.
Earthquakes create distinct types of waves with different velocities; when reaching seismic observatories, their different travel times help scientists to locate the source of the hypocenter. In geophysics the refraction or reflection of seismic waves is used for research into the structure of the Earth's interior, and man-made vibrations are often generated to investigate shallow, subsurface structures.
What is a Seismic Wave?
What happens if you disturb the water of a calm pond?
Yes exactly!
When you disturb the water, it will continuously produce ripples or waves.
Just like in an earthquake, the sudden movement of the underground rocks produces energy waves that moves the Earth’s surface.
These waves are called Seismic Waves. These waves could travel through and on the surface that cause the shaking and vibrations of the ground.
There are 2 types of Seismic waves: Body waves and Surface Waves.
Basically body waves are waves that travel through the Earth’s inner layer. And while Surface waves are waves that can ONLY travel through the surface layer, making the Body waves travel faster than the surface waves. However, surface waves causes more damage than the body waves.
Now the...
published: 13 May 2021
GCSE Physics - Seismic Waves #75
This video covers:
- The two types of seismic (earthquake) waves: S waves and P waves
- How we can detect seismic waves with seismometers
- How waves are refracted as they pass through the earth
- How scientists used this information to learn about the internal structure of the Earth
Exam board specific info:
AQA - Separate/triple science and higher tier only
IGCSE Edexcel - Not in your course
Edexcel - Don't need to know the details about how it was used to discover the internal structure of the earth
OCR 21st Century - Don't need to know the details, but the general idea of using waves to discover internal structure of earth is helpful
OCR Gateway - Not in your course
Maths Playlist:
https://www.youtube.com/playlist?list=PLidqqIGKox7XPh1QacLRiKto_UlnRIEVh
GCSE Chemistry playlist:...
published: 11 Mar 2020
How Earthquake occurs and what causes it | Seismic Waves | P and S Waves
This video is on how earthquake occurs, how it is formed and what are its causes. The study of seismic waves provides a complete picture of the layered interior. Why does the earth shake? What are P and S waves? What are surface waves and body waves? What are propagation of earthquake waves?
#earthquake #ncertgeography #upsc
Video of Dr. Keith Miller demonstrating P & S waves
https://goo.gl/SQypKg
Fill this feedback form for a better learning experience
https://goo.gl/vrYPBw
Click here if you want to subscribe
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published: 06 Jan 2017
Seismic waves earthquake
Seismic waves are the waves of energy caused by the sudden breaking of rock within the earth or an explosion. ... Earthquakes radiate seismic energy as both body and surface waves. Body Waves. Traveling through the interior of the earth, body waves arrive before the surface waves emitted by an earthquake.
published: 14 Jun 2020
Seismic waves | Earth geological and climatic history | Cosmology & Astronomy | Khan Academy
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/seismic-waves-tutorial/v/seismic-waves
S-waves and P-waves. Created by Sal Khan.
Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/seismic-waves-tutorial/v/why-s-waves-only-travel-in-solids?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy
Missed the previous lesson? https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/plate-techtonics/v/how-we-know-about-the-earth-s-core?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy
Cosmology & Astronomy on Khan Academy: The Earth is huge, but it is tiny compared to the Sun (...
published: 04 Feb 2011
EARTHQUAKE (Types of Seismic Waves, Earthquake Terminologies, and 4 Basic Types of Fault)
published: 09 May 2020
GCSE Physics Revision "Seismic Waves" (Triple)
GCSE workbooks https://www.amazon.co.uk/Dr-Shaun-Donnelly/e/B084FH9JPF?ref_=dbs_p_pbk_r00_abau_000000&_encoding=UTF8&tag=freesciencele-21&linkCode=ur2&linkId=1fbc0f5c3e7450e895637b56ee343168&camp=1634&creative=6738
School licenses from 40p per copy https://www.freesciencelessons.co.uk/school-licences/
In this video, we look at seismic waves. First we explore the two different types of seismic waves and then look at how they pass through the Earth. We then look at how this gives us information about the Earth's internal structure.
This video is based on the AQA spec. If you are following a different exam board then you should check your specification. The Amazon link above is an affiliate link. This provides a small commission which helps to support freesciencelessons. The cost remains t...
published: 25 Jan 2018
P and S waves on a slinky
When an earthquake happens energy spreads outwards in all directions in waves, like a ripple spreading across the surface of a pond. There are 2 main types of earthquake (seismic) waves, compressional P waves and transverse S waves. This video shows P and S waves moving down a slinky.
published: 24 Jun 2016
How Earthquakes Form: Unveiling the Forces Beneath! #meyzileyoutubeshorts
Earthquakes occur when there is a sudden release of energy in the Earth's crust, resulting in seismic waves that shake the ground. This energy release often occurs due to the movement of tectonic plates, which are large pieces of the Earth's lithosphere. When these plates grind against each other, tension builds up until it's released in the form of an earthquake. The epicenter is the point on the Earth's surface directly above where the earthquake originates. Understanding the complex geological processes involved in earthquake formation helps us prepare for and mitigate their impact.
published: 27 Dec 2023
Seismic Wave Propagation (Part 1)
Seismic wave propagation in a spherically symmetric Earth model.
Details:
Solver: AxiSEM (http://seis.earth.ox.ac.uk/axisem/)
Warm colors (red/yellow): P-waves (https://en.wikipedia.org/wiki/P-wave)
Cold colors (blue/green): S-waves (https://en.wikipedia.org/wiki/S-wave)
Refer to:
https://doi.org/10.5194/se-5-425-2014
https://doi.org/10.1093/gji/ggz394
What is a Seismic Wave?
What happens if you disturb the water of a calm pond?
Yes exactly!
When you disturb the water, it will continuously produce ripples ...
What is a Seismic Wave?
What happens if you disturb the water of a calm pond?
Yes exactly!
When you disturb the water, it will continuously produce ripples or waves.
Just like in an earthquake, the sudden movement of the underground rocks produces energy waves that moves the Earth’s surface.
These waves are called Seismic Waves. These waves could travel through and on the surface that cause the shaking and vibrations of the ground.
There are 2 types of Seismic waves: Body waves and Surface Waves.
Basically body waves are waves that travel through the Earth’s inner layer. And while Surface waves are waves that can ONLY travel through the surface layer, making the Body waves travel faster than the surface waves. However, surface waves causes more damage than the body waves.
Now there are 2 types of body waves.
The Primary Waves and the Secondary Waves.
Enjoy this video about Seismic Waves.
#SeismicWaves #Physics #EducationalVideo
CONTACT US
Email: [email protected]
Facebook Page: https://www.facebook.com/EarthPen
Youtube Channel: https://www.youtube.com/channel/UCX1Hh7CvEc3RCUd4NRBWJMw
What is a Seismic Wave?
What happens if you disturb the water of a calm pond?
Yes exactly!
When you disturb the water, it will continuously produce ripples or waves.
Just like in an earthquake, the sudden movement of the underground rocks produces energy waves that moves the Earth’s surface.
These waves are called Seismic Waves. These waves could travel through and on the surface that cause the shaking and vibrations of the ground.
There are 2 types of Seismic waves: Body waves and Surface Waves.
Basically body waves are waves that travel through the Earth’s inner layer. And while Surface waves are waves that can ONLY travel through the surface layer, making the Body waves travel faster than the surface waves. However, surface waves causes more damage than the body waves.
Now there are 2 types of body waves.
The Primary Waves and the Secondary Waves.
Enjoy this video about Seismic Waves.
#SeismicWaves #Physics #EducationalVideo
CONTACT US
Email: [email protected]
Facebook Page: https://www.facebook.com/EarthPen
Youtube Channel: https://www.youtube.com/channel/UCX1Hh7CvEc3RCUd4NRBWJMw
This video covers:
- The two types of seismic (earthquake) waves: S waves and P waves
- How we can detect seismic waves with seismometers
- How waves are refr...
This video covers:
- The two types of seismic (earthquake) waves: S waves and P waves
- How we can detect seismic waves with seismometers
- How waves are refracted as they pass through the earth
- How scientists used this information to learn about the internal structure of the Earth
Exam board specific info:
AQA - Separate/triple science and higher tier only
IGCSE Edexcel - Not in your course
Edexcel - Don't need to know the details about how it was used to discover the internal structure of the earth
OCR 21st Century - Don't need to know the details, but the general idea of using waves to discover internal structure of earth is helpful
OCR Gateway - Not in your course
Maths Playlist:
https://www.youtube.com/playlist?list=PLidqqIGKox7XPh1QacLRiKto_UlnRIEVh
GCSE Chemistry playlist:
https://www.youtube.com/watch?v=fN8kH9Vvqo0&list=PLidqqIGKox7WeOKVGHxcd69kKqtwrKl8W
GCSE Biology Playlist:
https://www.youtube.com/watch?v=--dIBinUdeU&list=PLidqqIGKox7X5UFT-expKIuR-i-BN3Q1g
GCSE Physics Playlist:
https://www.youtube.com/watch?v=aHVJfRxeAxo&list=PLidqqIGKox7UVC-8WC9djoeBzwxPeXph7
This video covers:
- The two types of seismic (earthquake) waves: S waves and P waves
- How we can detect seismic waves with seismometers
- How waves are refracted as they pass through the earth
- How scientists used this information to learn about the internal structure of the Earth
Exam board specific info:
AQA - Separate/triple science and higher tier only
IGCSE Edexcel - Not in your course
Edexcel - Don't need to know the details about how it was used to discover the internal structure of the earth
OCR 21st Century - Don't need to know the details, but the general idea of using waves to discover internal structure of earth is helpful
OCR Gateway - Not in your course
Maths Playlist:
https://www.youtube.com/playlist?list=PLidqqIGKox7XPh1QacLRiKto_UlnRIEVh
GCSE Chemistry playlist:
https://www.youtube.com/watch?v=fN8kH9Vvqo0&list=PLidqqIGKox7WeOKVGHxcd69kKqtwrKl8W
GCSE Biology Playlist:
https://www.youtube.com/watch?v=--dIBinUdeU&list=PLidqqIGKox7X5UFT-expKIuR-i-BN3Q1g
GCSE Physics Playlist:
https://www.youtube.com/watch?v=aHVJfRxeAxo&list=PLidqqIGKox7UVC-8WC9djoeBzwxPeXph7
This video is on how earthquake occurs, how it is formed and what are its causes. The study of seismic waves provides a complete picture of the layered interior...
This video is on how earthquake occurs, how it is formed and what are its causes. The study of seismic waves provides a complete picture of the layered interior. Why does the earth shake? What are P and S waves? What are surface waves and body waves? What are propagation of earthquake waves?
#earthquake #ncertgeography #upsc
Video of Dr. Keith Miller demonstrating P & S waves
https://goo.gl/SQypKg
Fill this feedback form for a better learning experience
https://goo.gl/vrYPBw
Click here if you want to subscribe
https://www.youtube.com/user/TheRealSengupta
This video is on how earthquake occurs, how it is formed and what are its causes. The study of seismic waves provides a complete picture of the layered interior. Why does the earth shake? What are P and S waves? What are surface waves and body waves? What are propagation of earthquake waves?
#earthquake #ncertgeography #upsc
Video of Dr. Keith Miller demonstrating P & S waves
https://goo.gl/SQypKg
Fill this feedback form for a better learning experience
https://goo.gl/vrYPBw
Click here if you want to subscribe
https://www.youtube.com/user/TheRealSengupta
Seismic waves are the waves of energy caused by the sudden breaking of rock within the earth or an explosion. ... Earthquakes radiate seismic energy as both bod...
Seismic waves are the waves of energy caused by the sudden breaking of rock within the earth or an explosion. ... Earthquakes radiate seismic energy as both body and surface waves. Body Waves. Traveling through the interior of the earth, body waves arrive before the surface waves emitted by an earthquake.
Seismic waves are the waves of energy caused by the sudden breaking of rock within the earth or an explosion. ... Earthquakes radiate seismic energy as both body and surface waves. Body Waves. Traveling through the interior of the earth, body waves arrive before the surface waves emitted by an earthquake.
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/science/cosmology-and-astronomy/earth-...
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/seismic-waves-tutorial/v/seismic-waves
S-waves and P-waves. Created by Sal Khan.
Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/seismic-waves-tutorial/v/why-s-waves-only-travel-in-solids?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy
Missed the previous lesson? https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/plate-techtonics/v/how-we-know-about-the-earth-s-core?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy
Cosmology & Astronomy on Khan Academy: The Earth is huge, but it is tiny compared to the Sun (which is super huge). But the Sun is tiny compared to the solar system which is tiny compared to the distance to the next star. Oh, did we mention that there are over 100 billion stars in our galaxy (which is about 100,000 light years in diameter) which is one of hundreds of billions of galaxies in just the observable universe (which might be infinite for all we know). Don't feel small. We find it liberating. Your everyday human stresses are nothing compared to this enormity that we are a part of. Enjoy the fact that we get to be part of this vastness!
About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.
For free. For everyone. Forever. #YouCanLearnAnything
Subscribe to Khan Academy’s Cosmology & Astronomy channel: https://www.youtube.com/channel/UChNPnEkW8LYZ5Rwi8_A2-DA?sub_confirmation=1
Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/seismic-waves-tutorial/v/seismic-waves
S-waves and P-waves. Created by Sal Khan.
Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/seismic-waves-tutorial/v/why-s-waves-only-travel-in-solids?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy
Missed the previous lesson? https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/plate-techtonics/v/how-we-know-about-the-earth-s-core?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy
Cosmology & Astronomy on Khan Academy: The Earth is huge, but it is tiny compared to the Sun (which is super huge). But the Sun is tiny compared to the solar system which is tiny compared to the distance to the next star. Oh, did we mention that there are over 100 billion stars in our galaxy (which is about 100,000 light years in diameter) which is one of hundreds of billions of galaxies in just the observable universe (which might be infinite for all we know). Don't feel small. We find it liberating. Your everyday human stresses are nothing compared to this enormity that we are a part of. Enjoy the fact that we get to be part of this vastness!
About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.
For free. For everyone. Forever. #YouCanLearnAnything
Subscribe to Khan Academy’s Cosmology & Astronomy channel: https://www.youtube.com/channel/UChNPnEkW8LYZ5Rwi8_A2-DA?sub_confirmation=1
Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
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School licenses from 40p per copy https://www.freesciencelessons.co.uk/school-licences/
In this video, we look at seismic waves. First we explore the two different types of seismic waves and then look at how they pass through the Earth. We then look at how this gives us information about the Earth's internal structure.
This video is based on the AQA spec. If you are following a different exam board then you should check your specification. The Amazon link above is an affiliate link. This provides a small commission which helps to support freesciencelessons. The cost remains the same to you. If you prefer not to use this, you can search Amazon for the Freesciencelessons workbooks.
Image credits: https://creativecommons.org/licenses/by/2.0/uk/
The Earth
NASA Apollo 17
https://commons.wikimedia.org/wiki/File:The_Earth_seen_from_Apollo_17.jpg#mw-jump-to-license
Earthquake
https://commons.wikimedia.org/wiki/File:Chuetsu_earthquake-myouken2.jpg
Music credit: Deliberate Thought by Kevin MacLeod is licensed under a Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/)
Source: http://incompetech.com/music/royalty-free/?keywords=deliberate+thought
Artist: http://incompetech.com/
GCSE workbooks https://www.amazon.co.uk/Dr-Shaun-Donnelly/e/B084FH9JPF?ref_=dbs_p_pbk_r00_abau_000000&_encoding=UTF8&tag=freesciencele-21&linkCode=ur2&linkId=1fbc0f5c3e7450e895637b56ee343168&camp=1634&creative=6738
School licenses from 40p per copy https://www.freesciencelessons.co.uk/school-licences/
In this video, we look at seismic waves. First we explore the two different types of seismic waves and then look at how they pass through the Earth. We then look at how this gives us information about the Earth's internal structure.
This video is based on the AQA spec. If you are following a different exam board then you should check your specification. The Amazon link above is an affiliate link. This provides a small commission which helps to support freesciencelessons. The cost remains the same to you. If you prefer not to use this, you can search Amazon for the Freesciencelessons workbooks.
Image credits: https://creativecommons.org/licenses/by/2.0/uk/
The Earth
NASA Apollo 17
https://commons.wikimedia.org/wiki/File:The_Earth_seen_from_Apollo_17.jpg#mw-jump-to-license
Earthquake
https://commons.wikimedia.org/wiki/File:Chuetsu_earthquake-myouken2.jpg
Music credit: Deliberate Thought by Kevin MacLeod is licensed under a Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/)
Source: http://incompetech.com/music/royalty-free/?keywords=deliberate+thought
Artist: http://incompetech.com/
When an earthquake happens energy spreads outwards in all directions in waves, like a ripple spreading across the surface of a pond. There are 2 main types of e...
When an earthquake happens energy spreads outwards in all directions in waves, like a ripple spreading across the surface of a pond. There are 2 main types of earthquake (seismic) waves, compressional P waves and transverse S waves. This video shows P and S waves moving down a slinky.
When an earthquake happens energy spreads outwards in all directions in waves, like a ripple spreading across the surface of a pond. There are 2 main types of earthquake (seismic) waves, compressional P waves and transverse S waves. This video shows P and S waves moving down a slinky.
Earthquakes occur when there is a sudden release of energy in the Earth's crust, resulting in seismic waves that shake the ground. This energy release often occ...
Earthquakes occur when there is a sudden release of energy in the Earth's crust, resulting in seismic waves that shake the ground. This energy release often occurs due to the movement of tectonic plates, which are large pieces of the Earth's lithosphere. When these plates grind against each other, tension builds up until it's released in the form of an earthquake. The epicenter is the point on the Earth's surface directly above where the earthquake originates. Understanding the complex geological processes involved in earthquake formation helps us prepare for and mitigate their impact.
Earthquakes occur when there is a sudden release of energy in the Earth's crust, resulting in seismic waves that shake the ground. This energy release often occurs due to the movement of tectonic plates, which are large pieces of the Earth's lithosphere. When these plates grind against each other, tension builds up until it's released in the form of an earthquake. The epicenter is the point on the Earth's surface directly above where the earthquake originates. Understanding the complex geological processes involved in earthquake formation helps us prepare for and mitigate their impact.
What is a Seismic Wave?
What happens if you disturb the water of a calm pond?
Yes exactly!
When you disturb the water, it will continuously produce ripples or waves.
Just like in an earthquake, the sudden movement of the underground rocks produces energy waves that moves the Earth’s surface.
These waves are called Seismic Waves. These waves could travel through and on the surface that cause the shaking and vibrations of the ground.
There are 2 types of Seismic waves: Body waves and Surface Waves.
Basically body waves are waves that travel through the Earth’s inner layer. And while Surface waves are waves that can ONLY travel through the surface layer, making the Body waves travel faster than the surface waves. However, surface waves causes more damage than the body waves.
Now there are 2 types of body waves.
The Primary Waves and the Secondary Waves.
Enjoy this video about Seismic Waves.
#SeismicWaves #Physics #EducationalVideo
CONTACT US
Email: [email protected]
Facebook Page: https://www.facebook.com/EarthPen
Youtube Channel: https://www.youtube.com/channel/UCX1Hh7CvEc3RCUd4NRBWJMw
This video covers:
- The two types of seismic (earthquake) waves: S waves and P waves
- How we can detect seismic waves with seismometers
- How waves are refracted as they pass through the earth
- How scientists used this information to learn about the internal structure of the Earth
Exam board specific info:
AQA - Separate/triple science and higher tier only
IGCSE Edexcel - Not in your course
Edexcel - Don't need to know the details about how it was used to discover the internal structure of the earth
OCR 21st Century - Don't need to know the details, but the general idea of using waves to discover internal structure of earth is helpful
OCR Gateway - Not in your course
Maths Playlist:
https://www.youtube.com/playlist?list=PLidqqIGKox7XPh1QacLRiKto_UlnRIEVh
GCSE Chemistry playlist:
https://www.youtube.com/watch?v=fN8kH9Vvqo0&list=PLidqqIGKox7WeOKVGHxcd69kKqtwrKl8W
GCSE Biology Playlist:
https://www.youtube.com/watch?v=--dIBinUdeU&list=PLidqqIGKox7X5UFT-expKIuR-i-BN3Q1g
GCSE Physics Playlist:
https://www.youtube.com/watch?v=aHVJfRxeAxo&list=PLidqqIGKox7UVC-8WC9djoeBzwxPeXph7
This video is on how earthquake occurs, how it is formed and what are its causes. The study of seismic waves provides a complete picture of the layered interior. Why does the earth shake? What are P and S waves? What are surface waves and body waves? What are propagation of earthquake waves?
#earthquake #ncertgeography #upsc
Video of Dr. Keith Miller demonstrating P & S waves
https://goo.gl/SQypKg
Fill this feedback form for a better learning experience
https://goo.gl/vrYPBw
Click here if you want to subscribe
https://www.youtube.com/user/TheRealSengupta
Seismic waves are the waves of energy caused by the sudden breaking of rock within the earth or an explosion. ... Earthquakes radiate seismic energy as both body and surface waves. Body Waves. Traveling through the interior of the earth, body waves arrive before the surface waves emitted by an earthquake.
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/seismic-waves-tutorial/v/seismic-waves
S-waves and P-waves. Created by Sal Khan.
Watch the next lesson: https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/seismic-waves-tutorial/v/why-s-waves-only-travel-in-solids?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy
Missed the previous lesson? https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/plate-techtonics/v/how-we-know-about-the-earth-s-core?utm_source=YT&utm_medium=Desc&utm_campaign=cosmologystronomy
Cosmology & Astronomy on Khan Academy: The Earth is huge, but it is tiny compared to the Sun (which is super huge). But the Sun is tiny compared to the solar system which is tiny compared to the distance to the next star. Oh, did we mention that there are over 100 billion stars in our galaxy (which is about 100,000 light years in diameter) which is one of hundreds of billions of galaxies in just the observable universe (which might be infinite for all we know). Don't feel small. We find it liberating. Your everyday human stresses are nothing compared to this enormity that we are a part of. Enjoy the fact that we get to be part of this vastness!
About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.
For free. For everyone. Forever. #YouCanLearnAnything
Subscribe to Khan Academy’s Cosmology & Astronomy channel: https://www.youtube.com/channel/UChNPnEkW8LYZ5Rwi8_A2-DA?sub_confirmation=1
Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
GCSE workbooks https://www.amazon.co.uk/Dr-Shaun-Donnelly/e/B084FH9JPF?ref_=dbs_p_pbk_r00_abau_000000&_encoding=UTF8&tag=freesciencele-21&linkCode=ur2&linkId=1fbc0f5c3e7450e895637b56ee343168&camp=1634&creative=6738
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In this video, we look at seismic waves. First we explore the two different types of seismic waves and then look at how they pass through the Earth. We then look at how this gives us information about the Earth's internal structure.
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Image credits: https://creativecommons.org/licenses/by/2.0/uk/
The Earth
NASA Apollo 17
https://commons.wikimedia.org/wiki/File:The_Earth_seen_from_Apollo_17.jpg#mw-jump-to-license
Earthquake
https://commons.wikimedia.org/wiki/File:Chuetsu_earthquake-myouken2.jpg
Music credit: Deliberate Thought by Kevin MacLeod is licensed under a Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/)
Source: http://incompetech.com/music/royalty-free/?keywords=deliberate+thought
Artist: http://incompetech.com/
When an earthquake happens energy spreads outwards in all directions in waves, like a ripple spreading across the surface of a pond. There are 2 main types of earthquake (seismic) waves, compressional P waves and transverse S waves. This video shows P and S waves moving down a slinky.
Earthquakes occur when there is a sudden release of energy in the Earth's crust, resulting in seismic waves that shake the ground. This energy release often occurs due to the movement of tectonic plates, which are large pieces of the Earth's lithosphere. When these plates grind against each other, tension builds up until it's released in the form of an earthquake. The epicenter is the point on the Earth's surface directly above where the earthquake originates. Understanding the complex geological processes involved in earthquake formation helps us prepare for and mitigate their impact.
Seismic waves are waves of energy that travel through the Earth's layers, and are a result of an earthquake, explosion, or a volcano that gives out low-frequency acoustic energy. Many other natural and anthropogenic sources create low-amplitude waves commonly referred to as ambient vibrations. Seismic waves are studied by geophysicists called seismologists. Seismic wave fields are recorded by a seismometer, hydrophone (in water), or accelerometer.
The propagation velocity of the waves depends on density and elasticity of the medium. Velocity tends to increase with depth and ranges from approximately 2 to 8km/s in the Earth's crust, up to 13km/s in the deep mantle.
Earthquakes create distinct types of waves with different velocities; when reaching seismic observatories, their different travel times help scientists to locate the source of the hypocenter. In geophysics the refraction or reflection of seismic waves is used for research into the structure of the Earth's interior, and man-made vibrations are often generated to investigate shallow, subsurface structures.
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Advertisement ...There are zones where the seismic waves move in different ways, suggesting structures that are colder or have a different composition than the surrounding molten rocks ... Read the full story here. Advertisement ... Read the full story here ... .
The good news for 2024 U.S ... earthquake count ... 8 ... 5 ... 6 ... The remainder is due to an uptick in seismic activity in Southern California ... Dec ... These are all manifestations of higher heat flow and warmer crust means less efficient transmission of seismic waves ... .
This mystery material – which is making seismic waves in the region behave strangely – could be evidence of a lost land from hundreds of millions of years ago ... C to F show the seismic wave anomalies in traditional map view and as cross-section.
This is a phenomenon whereby seismic waves, which are generated by earthquakes and other seismic activities, travel at different speeds depending on the direction in which they move through the Earth's crust.
There are zones where the seismic waves move in different ways, suggesting structures that are colder or have a different composition than the surrounding molten rocks ... of the different wave types.
... the ground, and singing along with Coldplay? Abu Dhabi is about to create a seismic wave as the British rock legends take the stage for a record-breaking four consecutive nights in the Capital.
As the two earthquakes struck at the faulted basin in Yinchuan with a shallow depth, the unique geological conditions with thick sediment layers brought an amplifying effect on seismic waves, which ...
The new analysis, published in Geophysical Research Letters, actually revisits data collected in the Eifel region 35 years ago by specialized trucks that direct seismic signals into Earth's crust and then detect reflected waves.
And researchers say it is 'very likely' that there are still more tracks to be found ... Advertisement ... With the projected size and impact velocity, the collision would have caused an enormous shock wave and is likely to have triggered seismic activity ... .
For ten straight minutes, the entire planet shook violently, sending seismic waves across itself that changed the world for the worse ...Violent, deadly waves nearly 100ft high radiated outward from the epicentre.
... killing more than 4,000 people, enough videos were taken on smartphones that scientists researching seismic activity were later able to use the clips to reconstruct its path and time between waves.
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This capability stems from the fact that both release energy that travels through the Earth as seismic waves ... Also, the nature of the explosive and the surrounding geological conditions can affect the propagation of seismic waves.