Earthquakes generate seismic waves, which can be detected with a sensitive instrument called a seismograph. With the advances in seismograph technology it has helped us understand earthquakes and Earth itself. (A man named Choko invented the earliest seismograph in China in 136 A.D.) Earthquakes generate seismic waves, which can be detected with a sensitive as we have progressed thought the centuries we have developed improvements in technology, lives have been saved and many more will. All that remains is to research what takes place before, during, and after an eart

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