SEISMOLOGY - Wilson's Web Page

SEISMOLOGY - Wilson's Web Page

SEISMOLOGY THE STUDY OF EARTHQUAKES Seismograph

A seismograph is an instrument that records vibrations that

are caused by seismic waves. Seismogram

When the waves from an earthquake reach a seismograph, it records them as lines on a chart

called a seismogram. How Does Earthquake Energy Travel? The released energy of an earthquake travels in

the form of seismic waves that radiate out from the focus. How Does Earthquake Energy Travel?

There are two kinds of seismic waves: Body waves are seismic waves that travel through the inside (body) of Earth to the surface.

Surface waves are seismic waves that travel through the top part (surface) of Earths crust

Two Kinds of Body Waves P Waves S waves

P Waves: Primary/Compression/Pressure Waves Fastest moving waves

can move through solids, liquids, and gases. Causes ground to compress and stretch in the same direction as the wave.

S Waves (Shear, Transverse Waves) slower than P waves. move rock from side to side. can travel only through solids.

Shake the particles perpendicular to the direction of the wave. Surface Waves (L waves)

Travel along the surface (top of Earths crust). Slowest (last waves to be felt). Most damaging Click here to see a Love wave in action.

Love Waves surface waves Check your understanding

1. Which kind of seismic wave travels the most slowly? 2. How are the motions of P waves and S waves different?

3. What do you think is the reason surface waves usually cause the most damage? Slinky Activity

Seismic Waves P Waves primary wave

S Waves secondary wave Love Waves surface wave

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