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CSET Earth and Space (219) Practice Tests & Test Prep by Exam Edge

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CSET Earth and Space Science Sample Test

1 of 5

A type of wave that is considered the slowest type of seismic wave is called a

Correct Answer:

surface wave

the correct answer to the question "a type of wave that is considered the slowest type of seismic wave is called a" is "surface wave." surface waves are one of the several types of seismic waves generated by earthquakes. unlike other seismic waves that travel through the earth's interior, surface waves propagate along the earth's surface.

surface waves are typically slower than body waves (such as primary and secondary waves), which travel through the interior of the earth. body waves include primary waves (p-waves), which are the fastest seismic waves and travel through solids, liquids, and gases, and secondary waves (s-waves), which only travel through solids and are slower than p-waves.

the slower speed of surface waves, compared to body waves, is due to their propagation path. while body waves move through the denser medium of the earth's interior, surface waves travel along the less dense surface, which increases their travel time. the propagation of surface waves involves particles moving in elliptical patterns, which is quite different from the linear or shear movement seen in body waves.

another significant aspect of surface waves is their high amplitude and longer duration, which contribute to their destructive potential. they cause the ground to move both sideways and in an up-and-down motion, somewhat akin to ocean waves. this movement pattern can result in severe ground shaking over large areas, making surface waves the most destructive type of seismic waves in terms of the damage to structures and landscapes.

in summary, surface waves are considered the slowest type of seismic waves due to their propagation along the earth's surface and the nature of their movement. their slow speed, combined with their large amplitude and oscillatory motion, also makes them particularly destructive during seismic events.