EARTHQUAKE

- There was a time -- Some 225 million years ago, when the Continents were not separated by oceans.   The earth's surface knew only one massive continent, called  Panagea.

- Then, some 200 million years ago, Panagea split into two major continents, one of them Gondwana- Land (Which contains Africa,South America, India and Australia).

- Gondwanaland continued to split into smaller land masses, one of them is the Indian Plate. It drifted at a speed of 9 meters per century towards the Eurasian plate.Where these giant plates met under enormous pressure , the Himalayans were formed.











Types of Earthquakes:-

Natural Earthquakes, caused by endogenic forces.
- Volcanic - caused due to volcanic eruptions.
- Tectonic, caused due to stress and strain along earth's plates or dislodging of rocks during faulting.
- Isostatic, caused by isostatic activity at a regional scale.
- Plutonic, Earthquakes originating deep inside the earth between 250 - 650 km deep.



How do Earthquakes Occur:-

- Many fault lines in the Earth's crust. A fault is where blocks of crust on either side are moving relative to one another. The typical average rate is around a millimetre per year.If this movement happened gradually it would pose few problems for people living near by.

- Unfortunately, Rocks do not behave that way. Strain builds up for decades or centuries until it reaches a critical level., and then everything gives in at once. Once a fault has given way at one point, slip movement may occur along its whole length, which may be hundreds or thousands of kilometres, though movement is usually restricted to a much shorter portion of the whole fault.

- The strongest seismic waves are generated at the initial break-points. The closer to the break-point the greater the energy and the greater the potential for destruction, especially if the break point is near the surface. The break point is called the earthquake focus, and the point on the surface directly above it is referred to as the epicentre.






Stupidity is an elemental force for which no earthquake is a match. MUSKAN
--MJN Corp..

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