What happens to the S wave as it reaches the outer core?
6. Figure 19.2b: S-waves do not travel through the outer core, creating an even bigger shadow zone for S-waves. The fact that S-waves do not travel through the outer core suggests that the latter is liquid.
Which does the disappearance of the S wave in the core suggest *?
S waves decrease in velocity indicating that the outer core does not behave like a solid substance.
Why does S wave have no ability to travel in fluid?
S-waves cannot travel through liquids. When they reach the surface they cause horizontal shaking. Liquids don't have any shear strength and so a shear wave cannot propagate through a liquid. Think of a solid material, like a rock.
Why does S wave velocity drop to zero at a depth of 2900km?
Wave velocity drops to zero at 2900 km depth, as this is where liquid core starts, and S- (shear) waves cannot travel through liquids.
Why do S-waves only travel through solids?
S-waves can only move through solids. This is because liquids and gases don't resist changing shape. P-waves and S-waves are the two types of body waves.
Why do S waves only travel through solids?
S-waves can only move through solids. This is because liquids and gases don't resist changing shape. P-waves and S-waves are the two types of body waves.
What will happen to the velocity of the S waves as it passes through the outer core where the material is liquid in form?
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. Partially molten areas may slow down the P waves and attenuate or weaken S waves.
Why does the velocity of P waves decrease at the mantle outer core boundary?
4. Figure 19.2a: P-waves generally bend outward as they travel through the mantle due to the increased density of mantle rocks with depth. This indicates that P-waves slow down in the outer core, suggesting that this layer has a significantly different composition from the mantle and may actually be liquid.
What is the speed of S and P waves in the outer core?
The P–wave velocity increases smoothly with depth from 8.1 km/s at the outer rim to 10.3 km/s above the inner core boundary. The boundary between the inner and outer core is fairly sharp. The P–wave velocity in the inner core is about 11.3 km/s.
Can S waves pass through the inner core?
S-waves cannot pass through liquids, and do not pass through Earth's core because the outer core is liquid.
Can S-waves travel through the outer core and the inner core?
S-waves cannot pass through liquids, and do not pass through Earth's core because the outer core is liquid.
Why does the velocity of P waves decrease at the mantle outer core boundary quizlet?
Outer core- P-waves bend downward when entering due to decrease in velocity and bend when they leave again, slows down P waves meaning it's a liquid waves – can't travel through, stops S waves from traveling through indicating it's liquid. What is seismic refraction?
Why are there no P waves or S waves 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.
Why can’t S waves travel through the inner core?
P waves travel through any type of medium, whereas S waves only move through solid environments — not liquid. This was a huge indication that the Earth's outer core is a liquid, as S waves don't appear to pass through it.
Does the velocity of P waves and S waves increase or decrease with increased depth in the lithosphere?
The velocity of P waves and S waves increases with increased depth in the lithosphere but.
Why does S wave velocity drop to zero at a depth of 2900 km?
Wave velocity drops to zero at 2900 km depth, as this is where liquid core starts, and S- (shear) waves cannot travel through liquids.
Can S waves travel through the outer core and the inner core?
S-waves cannot pass through liquids, and do not pass through Earth's core because the outer core is liquid.
What affects S wave velocity?
Both the P and the S wave velocities decrease with increasing temperature and with increasing organic content (Figure 12).
Do P waves increase or decrease in velocity as they enter the outer core?
P-wave velocities increase dramatically at the boundary between the liquid outer core and the solid inner core.
What happens to the P and S waves as they travel inside the Earth?
P waves travel fastest and are the first to arrive from the earthquake. In S or shear waves, rock oscillates perpendicular to the direction of wave propagation. In rock, S waves generally travel about 60% the speed of P waves, and the S wave always arrives after the P wave.
What is S wave velocity?
The p-wave velocity at the upper most mantle is 7.97 km/s, and the S-wave 4.55 km/s. The low velocity layer in the upper mantle occurs approximately at 140 km deep with a thickness of about 55–62 km.
Why do P wave velocities decrease in the outer core?
4. Figure 19.2a: P-waves generally bend outward as they travel through the mantle due to the increased density of mantle rocks with depth. … This indicates that P-waves slow down in the outer core suggesting that this layer has a significantly different composition from the mantle and may actually be liquid.
How do you find the velocity of an S wave?
To find shear wave velocity:
- Divide the shear modulus by the density of the material.
- Find the square root of this ratio. Mathematically, that's: Vs = √(G / ρ)
Feb 15, 2022