Which instrument is used for measuring the intensity of an earthquake ?

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Q: 69 (MPPSC/2011)
Which instrument is used for measuring the intensity of an earthquake ?

question_subject: 

Geography

question_exam: 

MPPSC

stats: 

0,52,8,52,1,0,7

keywords: 

{'seismograph': [0, 0, 0, 1], 'altimeter': [0, 0, 0, 1], 'earthquake': [2, 0, 2, 0], 'instrument': [4, 0, 2, 5], 'hythergraph': [0, 0, 0, 1], 'intensity': [0, 0, 0, 1]}