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Q.

Why earthquaks takes place?

Tags: science, computers & internet
Asked by Parth Dawle, 29 Apr '11 07:52 am
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Answers (4)

1.

The region below the earth's surface where the rupture of the fault starts is called as a 'hypocenter'. The point directly above the hypocenter on the earth's surface is called as the 'epicenter'. The calculated value of the earthquake size is called as the 'magnitude'. The measure of the shaking due to the earthquake is called as the 'intensity'. Earthquakes do occur in cold, hot or rainy climate and so, the concept of 'earthquake weather' has not been established. A majority of earthquakes have been recorded at a depth of less than 80 km i.e. 50 miles below the earth's surface. The deepest earthquakes have taken place at plate boundaries where the earth's crust is subducted into the mantle. These take place 750 km below the surface. Most of the earthquakes take place along plate boundaries. For example, the boundary between the Pacific plate and the North American plate or the huge Pacific plate. As earthquake waves have a frequency less than 20 Hz, these cannot be detected by humans ...more
Source: Buzzle.com
Answered by LIPSIKA, 29 Apr '11 08:00 am

 
  
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2.

The word earthquake is used to describe any seismic eventwhether natural or caused by humansthat generates seismic waves. earthquakes are caused mostly by rupture of geological faults, but also by other events such as volcanic activity, landslides, mine blasts, and nuclear tests. an earthquake's point of initial rupture is called its focus or hypocenter. the epicenter is the point at ground level directly above the hypocenter
Answered by Josna, 29 Apr '11 07:58 am

 
  
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3.

Because of constant shifting of plates covering earth's crust - called Tectonic Plates
Answered by Shashi LS, 29 Apr '11 07:54 am

 
  
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4.

Lookmaanytao ke anusaar,,
Koi kehta hai Humari prathwi naag pe tiki hai , koi kehta hai varaah ke daant pe tiki hai, koi kehta hai herculis ke kandhey pe tiki hai , koi kehta hai kachuey ki peeth pe tiki hai, koi kehta hai umeed pe tiki hai,
Itni saari lok maanytaao ko madyanazar rakhtey huey jab naag ya varaah ya koi bhi jab prathwi ko ek dusry.ko.detey hai to thodey se kammpann ki wajah se bhookamp aata hai !!
Answered by ashish, 29 Apr '11 08:06 am

 
  
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