Why do earthquakes happen?

Geologists said that the motion of the Earth's plates stoops and push the rocks.

What is Seismology?

 SEISMOLOGY 

This science is about of shaky waves and earthquakes that move around the earth. A seismologist studies shaky waves and earthquakes waves.

What Are Seismic Waves?

 Seismic Waves

The waves that are full of energy and caused the sudden movement of rock or an explosion.

Kinds Of Seismic Waves

We have many different kinds of such waves and all of them move in varied ways. The two original kinds of waves are surface waves and body waves.

Surface waves ripples on water and only move along the surface of the earth, whereas body waves move through the earth's inner layers. In both body and surface waves, earthquakes radiate seismic energy.

We have two kinds of body waves P waves and S waves The other name of P waves is primary waves that is first kind of body wave. This type of body wave can move through solid rock and molten material like water or the liquid layers of the earth. It looks like sound waves, pulling and pushing the rock it moves through. Can you imagine big clap sound of thunder and the windows purr at the same time? Because the sound waves are pulling and pushing on the windows, it is similar to P waves. Usually animals feel the P waves of an earthquake. Usually human can only feel the shaking and snoring of these waves.

The other name of S wave is secondary wave. It is the second wave we feel in an earthquake. This kind of waves are slower than P wave.

 Secondary wave can only move among solid rock. S wave can move rock down and up or side-to-side.

 Surface wave is the fastest wave and moves the ground from side-to side.

 Love Waves

 Love waves moves like secondary waves but they move  in  side  to  side  instead  of up  and  down.

Raleigh Waves

The other type of surface wave is the Raleigh Wave, it named by John William Strut, Lord Raleigh. This type of wave mathematically calculated the entity.

Raleigh wave rolls along the ground like a watery wave across an ocean. It rolls it moves the ground moves side-to-side and up and down in the same itinerary. The greatest the vibration felted from an earthquake is related to Raleigh wave in which is larger than the other waves.

Sometimes this stooping and forcing wave puts great pressure on the rocks. Rocks can be flexible, and can be stoop without rupture. Have you ever stretched a rubber band? May you know the rubber band will snap if someone increase the tension too much. If the force is increased too much the rock layer would move and like breakage of rock layers. This process result in fault. When the fault was created, the layers would move along a crack in the Earth's crust.This act (breakage of the rocks and the resulting movement) causes earthquake.

 When you feel the sliding of an earthquake or observe the ruination of a volcano, you observe Earthforce. In scientist's opinion, force means a pull or pushes that lead to change in movement. Earthforce means pulling or pushing in the crust, core or water of the Earth that lead to slid, torrent or ruination. 

 Under the surface of the Earth, Earthforce act as pulling and pushing against the crust.

The surface of the Earth that is the crust, is always moving, creating Earthforce.

Earthforces in water covered places or in underwater is about three-quarters of the Earth's crust.