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An area where no direct seismic waves from a particular earthquake can be detected?
shadow zone
What does the shadow zone have to do with earthquakes?
This is caused by the density variations in the earth which cause the velocity of seismic waves to change as they move between them which in turn causes refraction of the waves. Further to this, the earth's outer core is a liquid which prevents seismic S-waves from travelling through it. This leads to a zone on the opposite side of the earth from an earthquake where S-waves are not detected.
The shadow zone is caused by what waves as they travel through Earth?
refraction
What is the area of the earth that is unaffected by both P S waves?
The shadow zone
Why can s waves not be detected everywhere on earth after an earthquake?
S waves, or secondary waves, are a type of seismic wave that can only travel through solids. Since the Earth's outer core is liquid, S waves cannot pass through it, which creates an area on the opposite side of the Earth from an earthquake's epicenter where these waves are not detected. This results in an S-wave shadow zone, typically located between 103 and 180 degrees from the earthquake's source, where no S waves are recorded. Thus, their inability to traverse liquid prevents them from being detected everywhere on Earth after an earthquake.
An area where no direct seismic waves from a particular earthquake can be detected?
shadow zone
What is the band around the earth were seismic waves are not detected?
The band around the Earth where seismic waves are not detected is called the "shadow zone." This region exists between 105 to 140 degrees from the epicenter of an earthquake and is caused by the refraction of seismic waves within the Earth's core. It is divided into two main parts, the P-wave shadow zone and the S-wave shadow zone.
What is the band around the earth where seismic waves are not detected?
The band around the Earth where seismic waves are not detected is known as the seismic shadow zone. It exists between 105 and 140 degrees away from the earthquake epicenter. Seismic waves are not detected in this region due to the refraction and reflection of waves in the Earth's interior layers.
What does the shadow zone tell scientists about the earth core?
The shadow zone is an area on Earth's surface where no direct seismic waves from an earthquake can be detected due to the bending of the waves as they pass through the outer core. By studying the shadow zone, scientists can infer the composition and properties of the outer core, helping to understand the structure of the Earth's interior.
Why no seismic waves detected at the shadow zone?
In shadow zone, seismograph does not record signals. For P-wave it is b/w 104-145 degress.These earthquake waves exhibit same properties as other waves like reflection, refraction etc.As core has denser matter so P-waves will bend inward and hences they will form a shadow zone. S-waves don't pass through liquid phase, core. So, shadow zone is larger here.
Where are there no P waves or S waves?
In the Earth's outer core, which is composed of molten iron and nickel, seismic waves (P and S waves) are not able to travel through it due to its liquid state. This causes a shadow zone on the opposite side of the Earth from a seismic event, where P waves are completely deflected and S waves are not detected.
The shadow zone separates P waves that have reached the surface through the mantle from P waves that have reached the surface after passing through both the mantle and the core?
The shadow zone is a specific region on Earth's surface where P waves from earthquakes are not detected. This occurs because P waves are refracted or absorbed by the outer core, creating a gap in seismic wave detection between 105 and 140 degrees from the earthquake epicenter. P waves that pass through the mantle only can be detected beyond this shadow zone, while those that pass through both the mantle and core are detected closer to the epicenter.
Why are no p or S waves received in the shadow zone?
The shadow zone for seismic waves is an area on the Earth's surface where no P (primary) or S (secondary) waves are detected after an earthquake. This occurs because P waves can travel through both solid and liquid, but they bend and refract at the boundary between the Earth's mantle and outer core, creating a zone where they are not detected. S waves, however, cannot travel through liquid, and since they are completely absorbed by the outer core, they do not reach the shadow zone at all. Thus, the absence of both types of waves in this region is due to their respective interactions with the Earth's internal layers.
What is the shadow zone caused by?
The shadow zone is caused by the refraction of seismic waves in Earth's core. P and S waves are refracted (bent) as they travel through different layers of the Earth, leading to a region where they are not detected by seismographs.
What does the shadow zone tell scientists about Earths interior?
The shadow zone is an area on Earth's surface where no seismic waves are detected after an earthquake. This helps scientists understand the Earth's interior structure, as the absence of seismic waves in this zone indicates the presence of a liquid outer core that blocks the transmission of certain seismic waves.
Which area of earth is unaffected by both p and s waves?
The shadow zone, located at a distance of 103 to 143 degrees from the earthquake epicenter, is the area on Earth's surface where both P and S waves are completely absorbed and do not arrive due to the core's properties.
Is the shadow zone always in the same location on earth?
No, the shadow zone is not always in the same location on Earth. It varies depending on the position of the earthquake epicenter and the depth of the seismic waves generated. The shadow zone is formed due to the refraction of seismic waves as they pass through different layers of the Earth's interior, particularly the liquid outer core, creating areas where certain seismic waves cannot be detected. Consequently, its location changes with each seismic event.
