• Share
  • Email
  • Embed
  • Like
  • Save
  • Private Content
Stresses due to seismic waves
 

Stresses due to seismic waves

on

  • 158 views

 

Statistics

Views

Total Views
158
Views on SlideShare
158
Embed Views
0

Actions

Likes
0
Downloads
0
Comments
0

0 Embeds 0

No embeds

Accessibility

Categories

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

    Stresses due to seismic waves Stresses due to seismic waves Presentation Transcript

    • Geology Presentationby :Faraz Haider(+92 336 8666897)
    • Stresses Due ToSeismic WavesSeismic waves are waves of energy that travelthrough the Earths layers, and are a result ofan earthquake, explosion, or a volcano thatimparts low-frequency acoustic energy.
    • Types Of Seismic Waves Body Waves :Primary Waves and Secondary Waves. Surface Waves :Love Waves and Rayleigh Waves.
    • Body WavesBody Waves travel through the Interior of earth.They follow the ray paths refracted by thevarying density and modulus (Stiffness) of theearth interior.This effect is similar to the refraction of lightwaves.
    • Types of Body WavesThese are the fastest moving waves. There aretwo types of Body Waves. P (primary) Waves or Compressional Waves. S (secondary) waves or Shear Waves.
    • P (primary) WavesA longitudinal earthquake wave that travelsthrough the interior of the earth and is usuallythe first conspicuous wave to be recorded by aseismograph.
    • S (secondary) wavesA transverse earthquake wave that travelsthrough the interior of the earth and isusually the second conspicuous wave toreach a seismograph.
    • Surface WavesSurface waves are analogous to water waves andtravel along the earth’s surface.They Travel Slower then Body Waves because ofthere low frequency, long duration, and largeamplitude.They can be the most destructive type ofSeismic Waves.
    • Types of Surface wavesThere are two main types of surface wavesRayleigh WavesLove Waves
    • Impact Of Seismic WavesSeismicwaves result fromslip and rupture(breakage) ofrocks and plates ofearth along faults.
    • Disasters ofSeismic WavesThese wavescauses problemsfor buildings andweakened theirstrength.
    •  Earthquakes occur with the passage of largeseismic waves. In other words we can say that there is asequence of seismic waves following each other.
    • There is a Question raised that,How can we reduce the effectand destructions of Seismic waves…..?
    • Resistant TechniquesEarthquake may not be able to damage entirebuilding but it damage members of it.So special techniques are adopted :Base Isolation DevicesandSeismic Dampers
    • Base Isolation Devices
    • Seismic Dampers
    • Resistant StructureRectangles aresuch structure ofbuilding on whichthe Seismic wavesare less effective.
    • Rectangular Buildings
    • Arches and TrianglesArches and triangles are also suchstructures of building on which theSeismic waves are less effective or noteffect just like other buildings.
    • Arch Structures
    • Triangular Structures
    • PrecautionaryMeasurementsWe need different levels of resistance fordifferent classes of structures.Critical structures such as hospitals, powerplants, water-treatment, and chemical plants,dams, etc.
    •  These buildings must not only survive theshaking, but must remain in operation.These structure require the largestinvestment of resources to insure thatthey can provide services following anearthquake.
    • Thankyou…