The bending of seismic waves is called refraction. … Figure 19.2b:
S-waves do not travel through the outer core
Why is the S-wave shadow zone larger than the P-wave shadow zones are quizlet?
The S-wave shadow zone is a angle past 105 degrees, measured from the focus, that the S waves cannot exceed because they cannot travel through the Earth’s liquid region core. … The P-wave shadow zone is the result of the
refraction effects P-waves
go through as they travel deep inside the Earth.
Which shadow zone is larger P waves or S waves?
P-waves are about 1.7 times faster than the S-waves
.
On the other hand, S-waves are transverse waves or shear waves (motion of the medium is perpendicular to the direction of propagation of the wave) and are hence less easily transmitted through the medium.
What causes an S-wave shadow zone and why is it so big?
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.
How are P-wave and S-wave shadow zones similar?
The S-wave shadow zone occurs because S-waves cannot travel through the liquid outer core. The P-wave shadow zone occurs because seismic velocities are much lower in the liquid outer core than in the overlying mantle, and the P-waves are refracted in a way that leaves a gap.
Where do P-waves travel the fastest?
Because the
earth’s mantle
becomes more rigid and compressible as the depth below the asthenosphere increases, P-waves travel faster as they go deeper in the mantle. The density of the mantle also increases with depth below the asthenosphere. The higher density reduces the speed of seismic waves.
Which of the following is causes the P wave shadow zone?
Answer and Explanation: The p wave shadow zone is caused by
the refraction of the p waves
as they travel through the earth from one medium to another.
Why are there no P waves or S waves?
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. This causes the waves to travel in curved paths.
Which shadow zone is larger?
the
P-wave shadow zone
is larger than the S-wave shadow zone.
Why do P waves come first?
The direct P wave arrives first
because its path is through the higher speed, dense rocks deeper in the earth
. The PP (one bounce) and PPP (two bounces) waves travel more slowly than the direct P because they pass through shallower, lower velocity rocks. The different S waves arrive after the P waves.
Why do S waves cause more damage than P waves?
S waves are more dangerous than P waves
because they have greater amplitude and produce vertical and horizontal motion of the ground surface
. The slowest waves, surface waves, arrive last. They travel only along the surface of the Earth. There are two types of surface waves: Love and Rayleigh waves.
What does S wave shadow zone indicate?
The S wave shadow zone is
the area of the Earth’s surface where S waves are not detected following an earthquake
. This shadow zone has led geologists to a model of the Earth with a solid mantle and a liquid core. … Geologists have been able to calculate the size of the liquid core from these measurements.
Why do P waves occur on the other side of the Earth and S waves do not?
P-waves are compression waves that apply a force in the direction of propagation. As the interior of the Earth is almost incompressible, P-waves transmit their energy quite easily through the medium and thus travel quickly. … The energy is thus less easily transmitted through the medium, and S-waves are
slower
.
What does the P stand for in P wave?
Compressional waves are also called P-Waves, (P stands for
“primary”
) because they are always the first to arrive.
What is difference between P and S waves?
P waves are recorded earlier than S waves
, because they travel at a higher velocity. … P waves can travel through liquid and solids and gases, while S waves only travel through solids. Scientists use this information to help them determine the structure of Earth.
Why is it called Love waves?
type of seismic wave
…the two surface seismic waves, Love waves—named
after the British seismologist A.E.H. Love, who first predicted their existence—travel faster
. They are propagated when the solid medium near the surface has varying vertical elastic properties.
