believe it or not !
mysteries that, interests us.............. - EARTHQUAKES
abhy's den

 

 

What are Earthquakes?
Earthquakes are the vibrations ,which are felt when 2 of the techtonic plates push each other..
The point on earth, where these vibrations occur, is   called epicenter.
    1.Normal fault-2 plates have pull force
2.R
everse fault-2 plates try to push each other
3.    side-ways fault-2 plates try to move in opposite horizontal directions.
 
 

 

  Types of Waves-
When there is sudden break of shift in the 2 plates,waves are radiated,called seismic waves.
2 main types of waves---

1.     
primary waves-travel faster,travel through solid,liquid,gas.
2.   
secondary waves-travel slower than primary waves,pushes solid material in perpendicular direction to the path of the waves.


          

 prediction of  earthquakes ?

 
          No, till now, we are not able to successfully   
          predict accurately the, earthquakes.
         The only, correct prediction was in 1974  
          (china).the earthquake took place at 7:36 pm,  
          rocked the city of haicheng, china.thanks, to  
          this  prediction, there were very little 
          causality………..the magnitude on Richter scale    
          was  7.3.
  
     
 
          The local people of this city helped the   
          authorities, to predict this earthquake, by   
          reporting them, a very odd behavior of animals  
          and drop in water level in the wells.
 
 
 
         When, tsunami was about to occur in Andaman   
         and  nicobar island, it was reported that  
         animals    and birds showed a very odd behavior
.
 
     There are many theories for predicting   
     earthquakes, try to use yourself……
 

 ·      
Some, say, we can predict the happening of  
     earthquake, by noticing the movements of stars.

 

·          There is a high probability, that, if an   
     earthquake   has occurred at a particular place,   
     there may be an another strike soon
.

 

 ·       One possibility might be the study of faults in  
     the  rocks. When the tectonic plates move, they  
     build a strain in the rocks. 
·      
Scientists have noticed, tilting of ground in the  
     epicenter or near
it, just weeks or months  
     before  a strike.
·       Scientists have noticed, the release of gases  
     before an earthquake.
·         
Electricity can be conducted through the   
     ground,  and some scientists believe that   
     monitoring the  electric current
through certain  
    types of rocks
  might predict earthquakes.
...
.

 



          Why do Earthquakes occur-

 

          Earthquakes are caused mostly by rupture      
         of techtonic plates, but, it can be caused due    
         to volcanic activities, landslides, mine blasts,   
         and  nuclear experiments
.

               
          Effects of Earthquakes-
  
severe damage to the buildings,city 
   infrastructure,nature.....


--landslides are a major,problem in hilly 
   areas,if  an Earthquake of high intensity  
   occurs in these areas.

-- In areas along the coast, if an Earthquake  
    occurs,it may result in Tsunami....
..

 
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