earthquakes Flashcards

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1
Q

what are earthquakes

A

vibrations caused by earth movement at plate margins and major fault lines

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2
Q

how are they formed

A

2 plates trying to pass each other become locked. friction builds up and is released.the vibrations cause an earthquake

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3
Q

how are they measured

A

richter-measures energy released-uses a seismometer-scale 1 to 10 and 6 is ten times higher than 5 and one hundred times higher than 4. mercalli-measures damage done-scale 1 to 12

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4
Q

christchurch

A

6.3 richter scale. 22nd feb 2011. 30

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