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      ORED_ELGANA
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    : 24
    : Mar 2008
    : 3,876
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    08





     

     


    Seismic Waves :

    1. Body Waves

    Elastic Mediums :

    A- Compressional ,Longitudinal or P waves
    compressions Dilatations , 1992 . .


    B- Shear Waves
    P waves Solid Rocks ( ). (2). . : ( ) (:45) ( ) (:16)


    2- Surface Waves:

    .
    :



    C- Rayleigh Waves

    Uniform Solid Material Elliptical shape




    Body Waves , i.e,V p = 0.9 VS : ( * ) (:36-37)

    D-love Waves

    Non-uniform . Geophones .


    .
    Surface Waves . .




    Magnitude:
    Amplitude S waves,Pwaves epicenter 9:1 Richter scale 6 5 ...




    5:70 300:70 . (Tectonic Plates) .




    Asthenosphere Trench ɡ . ڡ ( ) (:12) : ( ) (:7).




    : ( ) (:88) .

    Earthquake Hazards

    1- Ground Shaking
    Liquefaction .


    2- Ground Displacements
    Flaut Line .
    3- Fire
    .
    4- Flooding
    Dams .
    :

    - Volcanoes . .
    .
    : ( ) (:40).
    : ( ) (:26)
    : ) * * ) (:45-47)


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  1. Endomy0001
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    ORED_ELGANA
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    : 04-25-2008, 10:19 AM
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