who invented the earliest instrument to tell people where earthquakes happened

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whoinventedtheearliestinstrumenttotellpeoplewhereearthquakeshappenedwhoinventedtheearliestinstrument

who invented the earliest instrument to tell people where earthquakes happened
who invented the earliest instrument to tell people where earthquakes happened

who invented the earliest instrument to tell people where earthquakes happened
张衡
是谁最早发明了测试地震的仪器?