Why Does The Line For S-Wave Velocity Disappear In The Outer Core?

Why Does The Line For S-wave Velocity Disappear In The Outer Core??

Why does the line for S-wave velocity disappear in the outer core? S-waves do not travel through liquids and the outer core is liquid. The wavelength of the tsunami decreases as the wave height builds.

Why do S waves disappear at the core mantle boundary quizlet?

Why do S waves disappear at the core-mantle boundary? The outer core is liquid and S waves cannot travel through a liquid.

Why does the velocity of P waves decrease at the mantle outer core boundary quizlet?

peridotite in the upper mantle seismic wave velocities decrease within the upper asthenosphere because peridotite contains at a few percent partial melt but not enough to completely stop s waves. … because s waves do not travel through the outer core they have a bigger shadow zone.

What causes the velocity of a P wave to increase when it enters the inner core quizlet?

What causes the velocity of a P-wave to slow down when it enters the outer core? a. The inner core is a much more dense material than the outer core. … The inner core is liquid and thus the wave speeds up.

How would you expect P waves and S waves to behave as they attempt to travel between 1 the mantle and the outer core and 2 the outer core and the inner core?

P-waves slow down at the mantle core boundary so we know the outer core is less rigid than the mantle. S-waves disappear at the mantle core boundary so the outer core is liquid.

Why does the line for S wave velocity disappear in the outer core quizlet?

Why does the line for S-wave velocity disappear in the outer core? S-waves do not travel through liquids and the outer core is liquid. The wavelength of the tsunami decreases as the wave height builds.

What is a fault quizlet?

fault. A fault is a break in a rock in which movement has taken place. Normal Fault. When areas of the Earth are pulled apart (tension/tensile stress) a normal fault is formed.

Do S waves increase or decrease in velocity as they enter the outer core?

S-waves do not pass through the outer part of the core. P-wave velocities increase dramatically at the boundary between the liquid outer core and the solid inner core.

In what way is the P-wave velocity line different from the S wave velocity line between the Earth’s surface and 2900 km depth?

(a) P-wave velocity has a higher value and a greater gradient than the S- wave velocity plot. P-wave velocity reduces sharply at 2900 km depth but not to zero as S-wave velocity does.

Why do P and S waves slow down in the asthenosphere?

Seismic waves travel more quickly through denser materials and therefore generally travel more quickly with depth. … Seismic waves move more slowly through a liquid than a solid. Molten areas within the Earth slow down P waves and stop S waves because their shearing motion cannot be transmitted through a liquid.

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Does the velocity of P waves and S waves increase or decrease with increasing depth in the lithosphere?

The average density of continental lithosphere is (The average density of oceanic lithosphere is ). The increase in density leads to increases the velocity of P and S-waves. Hence the velocity of P and S-waves increases with depth in the lithosphere.

Does the velocity of P waves and S waves increase or decrease with the increased depth in the lithosphere?

(Faster/slower) P and S waves indicate greater rigidity. The velocity of P waves and S waves (increases/decreases) with increased depth in the lithosphere. … S waves decrease in velocity indicating that the outer core does not behave like a solid substance.

What causes the abrupt change in both P wave and S wave velocities with increasing depth?

Temperature tends to lower the speed of seismic waves and pressure tends to increase the speed. Pressure increases with depth in Earth because the weight of the rocks above gets larger with increasing depth.

What happened to S and P waves as they travel inside the Earth?

S waves cannot pass through the liquid outer core but P waves can. The waves are refracted as they travel through the Earth due to a change in density of the medium. When the waves cross the boundary between two different layers there is a sudden change in direction due to refraction. …

Why do S-waves travel slower than P waves?

P-waves are compression waves that apply a force in the direction of propagation. … On the other hand S-waves are shear waves which means that the motion of the medium is perpendicular to the direction of propagation of the wave. The energy is thus less easily transmitted through the medium and S-waves are slower.

What happens to the S-waves as they reach the core of the Earth?

From 200-400 km depth the velocity of S-waves gradually increases again until reaching the 400 km transition zone where the S-wave velocity increases rapidly. … Below the 670 km transition zone S-wave and P-wave velocity increase in a less dramatic manner until reaching the mantle-core boundary at ~2900 km depth.

What does this graph demonstrate about the velocity of both waves as they travel away from the earthquake?

This graph shows the relationship between time and distance traveled by S- and P-waves. What does this graph demonstrate about the velocity of both waves as they travel away from the earthquake focus? The velocity of each wave increases with distance from the focus.

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What does the S wave shadow zone indicate about the interior of the Earth quizlet?

What does the S wave shadow zone tell us? S-waves cannot move through liquid and they were blocked from reaching the other side of earth by the outer crust so the outer crust must be liquid.

What is a tsunami quizlet?

A tsunami is a long high sea wave caused by an earthquake submarine landslide or other disturbances. As a tsunami nears the coastline it may rise to several feet and can cause great loss of life and property damage when it comes ashore. … A tsunami can occur at any time.

Can rocks bend?

When rocks deform in a ductile manner instead of fracturing to form faults or joints they may bend or fold and the resulting structures are called folds. … Because the strain rate is low and/or the temperature is high rocks that we normally consider brittle can behave in a ductile manner resulting in such folds.

Why do ships at sea tend not to notice tsunamis?

Why do ships at sea tend not to notice tsunamis? -Tsunamis in deep water have small wave height and long wavelength. … –In shallow water the energy of the tsunami must be contained within a larger water column. -In shallow water the energy of the tsunami must be contained within a smaller water column.

What is a footwall quizlet?

The foot wall is the block of rock that lies under the fault. The hanging wall is the block of rock that sits over the fault. In the normal fault the hanging wall lies under the fault and the footwall sits on top the fault.

Why does S wave velocity drop to zero at a depth of 2900 km Brainly?

At ~2 900 km the S wave velocity falls to 0. … S waves can’t travel through liquids and this depth is where the liquid outer core exists.

Which layer stops S waves from traveling through?

Unlike P waves S waves don’t move straight through the Earth. They only travel through solid material and so are stopped at the liquid layer in the Earth’s core.

What would S waves do when they enter the asthenosphere?

The velocity of s waves going through the asthenosphere decreases which tells us that peridotite contains a few percent partial melt but not enough to stop s waves.

Why are there no P wave or S wave received in the P wave shadow zone?

The shadow zone is the area of the earth from angular distances of 104 to 140 degrees from a given earthquake that does not receive any direct P waves. The shadow zone results from S waves being stopped entirely by the liquid core and P waves being bent (refracted) by the liquid core.

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How do P waves differ from S waves?

they differ from each other in speed. P-waves are the fastest waves that travel inside earth and can travel in all mediums. S- waves cannot travel in fluids as they dont have shear force.

What happens to P waves and S waves from a crustal earthquake when the waves reach Earth’s outer core?

What happens P waves are refracted when they reach the outer core? P waves can travel through a liquid and a solid and are refracted when they enter a new substance such as the outer core. A build up of stress in Earth’s crust do to mantle convection.

Can S-waves pass through the asthenosphere?

S-waves cannot travel through liquids or gases. Because the earth’s mantle becomes more rigid as its depth below the asthenosphere increases S-waves travel faster as they go deeper in the mantle.

S-Waves.
S-waves travel through materials with rigidity and density
greater density slower S-waves

Why do S-waves only travel through solids?

They can propagate through solid rocks because these rocks have enough shear strength. The shear strength is one of the forces that hold the rock together preventing it from falling into pieces. Liquids lack shear strength. … This is why S-waves cannot propagate through liquids.

What seismic waves travel slowest and fastest?

There are two types of body waves: P-waves travel fastest and through solids liquids and gases S-waves only travel through solids. Surface waves are the slowest but they do the most damage in an earthquake.

What causes the velocity of a P wave to slow down when it enters the outer core quizlet?

What causes the velocity of a P-wave to slow down when it enters the outer core? … The outer core is a much less dense material than the mantle. c. The outer core is liquid and thus the wave slows down.

Why does the velocity of P waves decrease at the mantle outer core boundary quizlet?

peridotite in the upper mantle seismic wave velocities decrease within the upper asthenosphere because peridotite contains at a few percent partial melt but not enough to completely stop s waves. … because s waves do not travel through the outer core they have a bigger shadow zone.

What causes the velocity of AP wave to increase when it enters the inner core?

The inner core is liquid and thus the wave speeds up.

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