Question

At $\sim 2,900 \mathrm{~km}$, the $\mathrm{S}$ wave velocity falls to $0 .$ Why? a. S waves can't travel through solids, and this depth is where the solid inner core exists. b. S waves can't travel through liquids, and this depth is where the liquid outer core exists. c. S waves can't travel through solids, and this depth is where the solid mantle exists. d. S waves entered the shadow zone.

Name: Problem 5, Chapter 2: Laboratory Manual for Introductory Geology
Uploaded: 2022-01-18T18:55:42-08:00
Duration: 37 s
Channel: Keshav Singh
Description: At ∼2,900 km, the S wave velocity falls to 0 . Why? a. S waves can't travel through solids, and this depth is where the solid inner core exists. b. S waves can't travel through liquids, and this depth is where the liquid outer core exists. c. S waves can't travel through solids, and this depth is where the solid mantle exists. d. S waves entered the shadow zone.

   At $\sim 2,900 \mathrm{~km}$, the $\mathrm{S}$ wave velocity falls to $0 .$ Why?
a. S waves can't travel through solids, and this depth is where the solid inner core exists.
b. S waves can't travel through liquids, and this depth is where the liquid outer core exists.
c. S waves can't travel through solids, and this depth is where the solid mantle exists.
d. S waves entered the shadow zone.

Laboratory Manual for Introductory Geology

Bradley Deline,… 2016 Edition

Chapter 2, Problem 5

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Solved by Expert Keshav Singh

01/18/2022

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At $\sim 2,900 \mathrm{~km}$, the $\mathrm{S}$ wave velocity falls to $0 .$ Why? a. S waves can't travel through solids, and this depth is where the solid inner core exists. b. S waves can't travel through liquids, and this depth is where the liquid outer core exists. c. S waves can't travel through solids, and this depth is where the solid mantle exists. d. S waves entered the shadow zone.

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Key Concepts

S-Wave Propagation

S-waves, or shear waves, are a type of seismic wave that move by shearing and require a rigid medium to propagate. They cannot travel through liquids because liquids do not support shear stresses, which is why their velocity drops to zero when entering a liquid layer.

Earth's Internal Structure

The Earth is composed of several layers, including the solid crust, the mantle, and the outer and inner cores. The outer core is a liquid layer located at approximately 2,900 km depth, which is crucial to understanding why S-waves are not detected beyond this boundary.

Liquid Medium and Seismic Transmission

The inability of S-waves to travel through liquids is key to interpreting seismic data. When waves reach the liquid outer core, their energy is not transmitted as shear waves, leading to a cessation of their propagation and creating a seismic shadow zone.

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