you will know that earthquake is happening when the ground is shaking
earthquake cannot be predicted
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mhiell
Earthquakes are measured using instruments called SEISMOMETER/S, that detect the vibrations caused by seismic waves as they travel through the crust. Seismic waves can be both natural (from earthquakes) or caused by human activity (explosions).
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Answer:
earthquake occur when the volcano erupted
earthquake occur when tsunami had happen
you will know that earthquake is happening when the ground is shaking
earthquake cannot be predicted