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زلزلے کیوں آتے ہیں ؟ Why earthquake occurs?

 زمین کی پرت میں زیادہ تر خرابیاں زیادہ دیر تک حرکت نہیں کرتیں۔ لیکن بعض صورتوں میں، فالٹ کے دونوں طرف کی چٹان ٹیکٹونک قوتوں کی وجہ سے وقت کے ساتھ ساتھ آہستہ آہستہ خراب ہوتی جاتی ہے۔


 زلزلے عام طور پر اس وقت آتے ہیں جب زیر زمین چٹان اچانک ٹوٹ جاتی ہے اور فالٹ کے ساتھ تیزی سے حرکت ہوتی ہے۔ توانائی کا یہ اچانک اخراج زلزلہ کی لہروں کا سبب بنتا ہے جو زمین کو ہلا دیتی ہیں۔ زلزلے کے دوران اور بعد میں، پلیٹیں یا چٹان کے بلاکس حرکت کرنے لگتے ہیں- اور وہ اس وقت تک حرکت کرتے رہتے ہیں جب تک کہ وہ دوبارہ پھنس نہ جائیں۔ زیر زمین وہ جگہ جہاں چٹان سب سے پہلے ٹوٹتی ہے اسے زلزلے کا فوکس یا ہائپو سینٹر کہا جاتا ہے۔ فوکس کے بالکل اوپر کی جگہ (زمین کی سطح پر) کو مرکز کہا جاتا ہے۔


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