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.
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
https://www.youtube.com/user/TheRealSengupta
published: 06 Jan 2017
SEISMIC WAVES | Easy Physics Animation
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
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
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
Demonstrating P and S Seismic Waves
Demonstration of P and S waves properties using students to represent atoms in solids and liquids.
published: 22 Jan 2012
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
Seismic Waves—P- and S-wave particle motion and relative wave-front speeds
www.iris.edu
Earthquake!! The P wave propagates at ~6 km/sec in rock with particle motions that are parallel to the direction of propagation. The S wave is slower at 4 km/sec and propagates with particle motions that are perpendicular to the direction of propagation. When we record these waves, the gap between the P wave and the S wave provides information about how far away the earthquake occurred from the seismograph.
Narrated by Michael Hubenthal, Incorporated Research Institutions for Seismology
Animated by Jenda Johnson, Earth Sciences Animated (for IRIS)
published: 15 May 2020
The Great Lisbon Earthquake: A City Transformed #shorts #history
Discover the story of the Great Lisbon Earthquake of 1755 and its profound impact on Portugal and the world. A seismic event that changed history! #lisbonearthquake #history #Seismic #portugal #disaster #shorts #youtubeshorts #viralshorts
published: 05 Sep 2024
Propagation of Seismic Waves: S-waves
The world was shocked by the news of massive earthquakes and devastating tsunamis in Japan. The event could easily be one of the most tragic natural disasters in recent history.
Scientific understanding and modeling of complicated physical phenomena and engineering based on such analysis is imperative to prevent unnecessary loss of life from natural disasters.
In a post on the Wolfram Blog, Yu-Sung Chang, Wolfram Research's Technical Communication and Strategy Manager, explores the science behind earthquakes to better understand why they happen in a post on the Wolfram Blog.
This video is one of the Mathematica animations generated for his post. You can read more at:
http://blog.wolfram.com/2011/03/18/built-to-last-understanding-earthquake-engineering
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
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
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.
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.
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
www.iris.edu
Earthquake!! The P wave propagates at ~6 km/sec in rock with particle motions that are parallel to the direction of propagation. The S wave is slow...
www.iris.edu
Earthquake!! The P wave propagates at ~6 km/sec in rock with particle motions that are parallel to the direction of propagation. The S wave is slower at 4 km/sec and propagates with particle motions that are perpendicular to the direction of propagation. When we record these waves, the gap between the P wave and the S wave provides information about how far away the earthquake occurred from the seismograph.
Narrated by Michael Hubenthal, Incorporated Research Institutions for Seismology
Animated by Jenda Johnson, Earth Sciences Animated (for IRIS)
www.iris.edu
Earthquake!! The P wave propagates at ~6 km/sec in rock with particle motions that are parallel to the direction of propagation. The S wave is slower at 4 km/sec and propagates with particle motions that are perpendicular to the direction of propagation. When we record these waves, the gap between the P wave and the S wave provides information about how far away the earthquake occurred from the seismograph.
Narrated by Michael Hubenthal, Incorporated Research Institutions for Seismology
Animated by Jenda Johnson, Earth Sciences Animated (for IRIS)
Discover the story of the Great Lisbon Earthquake of 1755 and its profound impact on Portugal and the world. A seismic event that changed history! #lisbonearthq...
Discover the story of the Great Lisbon Earthquake of 1755 and its profound impact on Portugal and the world. A seismic event that changed history! #lisbonearthquake #history #Seismic #portugal #disaster #shorts #youtubeshorts #viralshorts
Discover the story of the Great Lisbon Earthquake of 1755 and its profound impact on Portugal and the world. A seismic event that changed history! #lisbonearthquake #history #Seismic #portugal #disaster #shorts #youtubeshorts #viralshorts
The world was shocked by the news of massive earthquakes and devastating tsunamis in Japan. The event could easily be one of the most tragic natural disasters i...
The world was shocked by the news of massive earthquakes and devastating tsunamis in Japan. The event could easily be one of the most tragic natural disasters in recent history.
Scientific understanding and modeling of complicated physical phenomena and engineering based on such analysis is imperative to prevent unnecessary loss of life from natural disasters.
In a post on the Wolfram Blog, Yu-Sung Chang, Wolfram Research's Technical Communication and Strategy Manager, explores the science behind earthquakes to better understand why they happen in a post on the Wolfram Blog.
This video is one of the Mathematica animations generated for his post. You can read more at:
http://blog.wolfram.com/2011/03/18/built-to-last-understanding-earthquake-engineering
The world was shocked by the news of massive earthquakes and devastating tsunamis in Japan. The event could easily be one of the most tragic natural disasters in recent history.
Scientific understanding and modeling of complicated physical phenomena and engineering based on such analysis is imperative to prevent unnecessary loss of life from natural disasters.
In a post on the Wolfram Blog, Yu-Sung Chang, Wolfram Research's Technical Communication and Strategy Manager, explores the science behind earthquakes to better understand why they happen in a post on the Wolfram Blog.
This video is one of the Mathematica animations generated for his post. You can read more at:
http://blog.wolfram.com/2011/03/18/built-to-last-understanding-earthquake-engineering
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
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
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.
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.
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
www.iris.edu
Earthquake!! The P wave propagates at ~6 km/sec in rock with particle motions that are parallel to the direction of propagation. The S wave is slower at 4 km/sec and propagates with particle motions that are perpendicular to the direction of propagation. When we record these waves, the gap between the P wave and the S wave provides information about how far away the earthquake occurred from the seismograph.
Narrated by Michael Hubenthal, Incorporated Research Institutions for Seismology
Animated by Jenda Johnson, Earth Sciences Animated (for IRIS)
Discover the story of the Great Lisbon Earthquake of 1755 and its profound impact on Portugal and the world. A seismic event that changed history! #lisbonearthquake #history #Seismic #portugal #disaster #shorts #youtubeshorts #viralshorts
The world was shocked by the news of massive earthquakes and devastating tsunamis in Japan. The event could easily be one of the most tragic natural disasters in recent history.
Scientific understanding and modeling of complicated physical phenomena and engineering based on such analysis is imperative to prevent unnecessary loss of life from natural disasters.
In a post on the Wolfram Blog, Yu-Sung Chang, Wolfram Research's Technical Communication and Strategy Manager, explores the science behind earthquakes to better understand why they happen in a post on the Wolfram Blog.
This video is one of the Mathematica animations generated for his post. You can read more at:
http://blog.wolfram.com/2011/03/18/built-to-last-understanding-earthquake-engineering
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.