What Is Earthquake Short Note What Is An Earthquake And Why Does It Occur

The nature of earthquakes causes of earthquakes.

Current time in turkey right now. These explosions may be set off to break rock while making tunnels for roads railroads subways or mines. Causing a range of effects from unnoticeable mild tremors to violent prolonged shaking an earthquake is a natural phenomenon that occurs frequently only in certain areas of the world. Earthquake like seismic waves can also be caused by explosions underground.

To put it simple earthquake is the shaking of the earth. Earthquake magnitude is a measure of the size or amplitude of the seismic waves generated by an earthquake source and recorded by seismographs. The most important earthquake belt is the circum pacific belt which.

These explosions however dont cause very strong seismic waves. An earthquake is the sudden movement of earths crust at a fault line. This photograph shows the san andreas fault a 750 mile long fault in california.

The difference in position between the shaking part of the seismograph and the motionless part is what is recorded. But what is an earthquake. An earthquakes most intense shaking is often felt near the epicenter.

Earthquakes and volcanoes are examples of sudden movements which originate from inside the earth. Instead the spring or string that it is hanging from absorbs all the movement. Severely affected regions include for example the west coast of north and south america indonesia japan central asia and parts of china and turkey and in europe italy greece and iceland in particular where strong quakes are recurrent.

The location where an earthquake begins is called the epicenter. An earth quake can be defined as a sudden violent shaking of the ground as a result of movements in the earths crust or volcanic action. An earthquake is a shock wave that radiates to the earths surface from underground.

The 1960 chilean earthquake broke along 800 kilometers of the fault line. The types and nature of these waves are described in the section seismic wavesbecause the size of earthquakes varies enormously it is necessary for purposes of comparison to compress the range of wave amplitudes. We have already seen the types of volcanoes.

Sometimes seismic waves occur when the roof or walls of a mine collapse. Earthquakes are usually quite brief but there may be many over a short time frame. The study of earthquakes is called seismology.

Most news stories on earthquakes will list the epicenter of an earthquake and then tell how deep the earthquake was from the epicenter. The strongest earthquakes usually occur along the plate boundaries. Earths major earthquakes occur mainly in belts coinciding with the margins of tectonic plates.

Great earthquakes that occur in subduction zones may give an earthquake focus but they actually break along hundreds of kilometers. This has long been apparent from early catalogs of felt earthquakes and is even more readily discernible in modern seismicity maps which show instrumentally determined epicentres.