How does an earthquake in Sumatra/Indonesia make tidal waves on the coast of Africa 4 thousand mikes away?

Has something to do with the electromagnetic spectrum.

7 Answers

  • 2 months ago

    same way that you make a wave in your bathtub make it to the far wall of the tub. The scale is different of course, but the process is the same. There is no em phenomenon related aspect. It is purely a mass/volume, rate, and viscosity issue. Once the pulse is generated, it will migrate until friction stops it.

    As a wave phenomenon, tsunamis do have many common characteristics to electromagnetic energy propagation, as both display wave-migration behaviors.

  • 2 months ago

    It has nothing to do with the electromagnetic spectrum. Seismic waves are SOUND waves. The waves be come bigger and taller as the depth to ocean floor decreases. Sound waves require a medium to be transmitted. The medium can be a plasma, gas, liquid or solid.

    Source(s): B.S. geology, M.S. ABT geophysics, B.S. physical geography, M.S. geology
    • Thomas E
      Lv 6
      2 months agoReport

      Audible sound is at the very bottom of the electromagnetic spectrum, and covers about 8 octaves, whereas visible light only covers one octave; an octave being a doubling of the base frequency.

  • Ron
    Lv 7
    2 months ago

    Earthquakes do not cause tidal waves. Tidal waves are caused by the gravitational pulls of the Moon and the Sun. What you are referring to is a tsunami. Both earthquakes and tsunami are caused by vertical displacements of the seafloor. Tsunami are hard to detect at the sea surface in deep water, but as they approach shore and shallow water they grow in height.

  • 2 months ago

    They're not tidal waves, they're tsunami waves. When a megathrust earthquake occurs, it shifts the ocean floor, displacing water much the same way throwing a rock in a pond does, albeit on a scale of hundreds of miles rather than a few inches. The ripples from that water displacement spread out across the ocean, impacting shorelines thousands of miles away. It has nothing to do with the EM spectrum and everything to do with kinetic energy.

    Tidal waves are much smaller, shorter waves that result from an entirely different kind of wave called a seich. This seich is the size of the planet, and local waves associated with it increase when their portion of earth's surface rotates into the seich crest. This is what we call high tide. The crests of the seich occur on the side of the earth facing the moon and the side exactly opposite the moon.

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  • Greg
    Lv 7
    2 months ago

    Tidal waves travel long distances. They only show up above sea level in shallow water. Water is semi-compressible. It has nothing to do with the spectrum.

  • Anonymous
    2 months ago

    Magic. And the fact that tidal waves can cover large distances.

  • Mike
    Lv 7
    2 months ago

    The sea bottom shifts and drops causing a tidal wave during a earthquake

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