Goseeko blog
  • Home
  • Engineering
    • Civil
    • Electronics
    • Computers
  • Science
    • Chemistry
    • Maths
    • Physics
  • Commerce
  • Arts
  • E-Learning
  • Career
  • Exams
  • Scholarships
  • Hiring News
  • Goseeko- Smart Study Material
@2021 - All Right Reserved. Designed and Developed by PenciDesign
Top Posts
Goseeko launches its own certifications for engineering and...
Online certifications which you can get in a...
What is Race around Condition?
What is a Development Plan ?
What is a Co-operative Bank?
What are the properties of Laser?
Top 5 Websites for Academic Research
What is regula-falsi method?
Top 10 Engineering YouTube Channels for Engineers
What is Lorentz Transformation?
What are Toposheets?
What is Pumping and its types?
Civil

Seismic Waves

by Swati 30/10/2021
written by Swati 30/10/2021 0 comment
Seismic Waves

Seismic Waves:

  • Seismic waves are the waves which are formed by sudden breaking of rock within the earth.
  • Earthquake produces two types of seismic waves which are as follows:
  1. Body waves
  2. Surface waves

1.Body Waves:

  • Body waves are seismic waves that travel through the body of the earth. 
  • Body waves are reflected and transmitted at interfaces where seismic velocity and/or density change, and they obey Snell’s law.
  • The two different types of body waves are:
  1. P-Waves:
  • P-Waves (P stands for primary or pressure or push pull). 
  • These waves are also called longitudinal waves or compressional waves due to particle compression during their transport.
  • These waves involve compression and rarefaction of the material as the wave passes through it but not rotation. 
  • P-wave is transmitted by particle movement back and forth along the direction of propagation of the wave.
  • The most correct description of P-waves is, it is a dilational or irrotational waves. 
  • P-wave has the greatest speed and appears first on seismograms.
  1. S-Waves:
  • S-Waves (S stands for secondary or shear or shake). 
  • Also known as transverse waves, because particle motions are transverse to the direction of movement of the wavefront, or perpendicular to the ray.
  • These waves involve shearing and rotation of the material as the wave passes through it, but not volume change. 
  • S-waves have speeds less than P-waves, and appear on seismograms after P-waves.

2. Surface Waves:

  • Surface waves are seismic waves that are guided along the surface of the Earth and the layers near the surface.
  • These waves do not penetrate the deep interior of the earth, and shallow earthquakes(nuclear explosions do not generate these surface waves) normally do not generate these waves.
  • Surface waves are larger in amplitude and longer in duration than body waves. 
  • These waves arrive at seismograph after the arrival of P- and S-waves because of their slower velocities. 
  • The two different surface waves are:
  1. Rayleigh waves:
  • Rayleigh waves or descriptively called “ground roll” in exploration seismology. 
  • The particle motion of this wave is confined to a vertical plane containing the direction of propagation and retrogrades elliptically. 
  • The particle displacements are greatest at the surface and decrease exponentially downward. 
  • Rayleigh waves show dispersion, and its velocity is not constant but varies with wavelength. 
  • This wave is similar to how ocean waves propagate.
  1. Love waves:
  • These waves (named after A.E.H. Love, who discovered them) travel by a transverse motion of particles that is parallel to the ground surface.
  • This wave is somewhat similar to S-waves. 
  • Love waves cannot exist in a uniform solid, and can only occur when there is a general increase of S-wave velocity with depth. 
  • Their existence is another proof the Earth’s vertical in homogeneity.
  • The particle motion is transverse and horizontal. 
  • Generally, Love wave velocities are greater than Rayleigh waves, so Love waves arrive before Rayleigh waves on seismograph.
Share
0
FacebookTwitterPinterestLinkedinTumblr
previous post
What is method of variation of parameters?
next post
What is the Important difference between Java and JavaScript?

You may also like

What is Ventilation?

30/10/2021

Types of Survey in Civil Engineering

30/10/2021

What is Evaporation ?

30/10/2021

What is Piers?

30/10/2021

What is Cofferdam?

30/10/2021

What is Caissons?

30/10/2021

Under Reamed Pile

30/10/2021

What is Reaction Turbine?

30/10/2021

What is Shoring?

30/10/2021

What is Well Foundation?

30/10/2021

Leave a Comment Cancel Reply

Save my name, email, and website in this browser for the next time I comment.

Keep in touch

Facebook Twitter Instagram Youtube

Popular Posts

  • 1

    What is Race around Condition?

    03/08/2021
  • 2

    What is a Development Plan ?

    02/08/2021
  • 3

    What is a Co-operative Bank?

    03/08/2021
  • 4

    What are the properties of Laser?

    02/07/2021
  • 5

    Top 5 Websites for Academic Research

    11/07/2021
  • 6

    What is regula-falsi method?

    03/08/2021
  • 7

    Top 10 Engineering YouTube Channels for Engineers

    10/07/2021
  • 8

    What is Lorentz Transformation?

    02/07/2021
  • 9

    What are Toposheets?

    07/07/2021
  • 10

    What is Pumping and its types?

    03/08/2021

Categories

  • Arts
  • Career
  • Chemistry
  • Civil
  • Commerce
  • Computers
  • E-Learning
  • Electronics
  • Engineering
  • Exams
  • Hiring News
  • Maths
  • Physics
  • Scholarships
  • Uncategorized

Read alsox

What are Intakes?

31/05/2021

Purpose and Types of Methods for...

31/05/2021

What is SBPS?

31/05/2021