Earthquakes at fault lines in Earth's crust create seismic waves, which are longitudinal...

Question:

Earthquakes at fault lines in Earth's crust create seismic waves, which are longitudinal (P-waves) or transverse (S-waves). The P-waves have a speed of about 7 km/s. Estimate the average bulk modulus of Earth's crust given that the density of rock is about 2500 kg/m{eq}^3{/eq}.

Speed of Waves:

The speed of a wave through a medium is directly proportional to the bulk modulus of the medium and inversely proportional to the density of the medium. A P-wave is an elastic body wave produced at the Earth's crust at the time of the earthquake.

Answer and Explanation: 1

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We are given the following data:

  • Speed of the P-waves is {eq}{\upsilon _p} = 7\;{\rm{km/s}} = 7000\;{\rm{m/s}} {/eq}
  • Density of the rock is...

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Mechanical Waves: Production & Propagation

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Chapter 17 / Lesson 9
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Learn about what mechanical waves are, how they are produced, types and characteristics of mechanical waves, factors that can affect them, and examples of familiar mechanical waves.


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