# GEOLOGY

## EARTH SCIENCE

### EARTHQUAKES

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which is the fastest type of seismic wave?
 A p-waves B s-waves C surface waves D None of the above
Explanation:

Detailed explanation-1: -P Waves. The first kind of body wave is the P wave or primary wave. Itâ€™s the fastest kind of seismic wave, and the first to arrive at a seismic station. P waves can move through solid rock and fluids, like water or the liquid layers of the Earth.

Detailed explanation-2: -Why do P waves arrive first? When an earthquake occurs, seismic waves, including P and S waves carry energy away from the hypocenter in all directions. The P wave propagates with a velocity of about six kilometers per second in rock, while the S wave is slower at four kilometers per second.

Detailed explanation-3: -S waves are more dangerous than P waves because they have greater amplitude and produce vertical and horizontal motion of the ground surface. The slowest waves, surface waves, arrive last. They travel only along the surface of the Earth. There are two types of surface waves: Love and Rayleigh waves.

Detailed explanation-4: -P waves, or Primary waves, are the first waves to arrive at a seismograph. P waves are the fastest seismic waves and can move through solid, liquid, or gas. They leave behind a trail of compressions and rarefactions on the medium they move through. P waves are also called pressure waves for this reason.

Detailed explanation-5: -P waves can travel through liquid and solids and gases, while S waves only travel through solids. Scientists use this information to help them determine the structure of Earth. For example, if an earthquake occurs on one side of Earth, seismometers around the globe can measure the resulting S and P waves.

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