震動圖是由地震儀所繪製的。震動圖是根據各個地震測量局測量的地面移動來繪製的。供繪製震動圖所用的探測到的能量可能是來自於地震,也可能有其他來源,例如爆炸。
人們曾經將紙綁成一個能轉動的鼓狀物用來記錄震動。有一些人用筆和普通的紙,另一些人則用集束光曝光底片。現在,基本上所有的震動圖是由數碼紀錄,以便於電腦分析。一些「鼓狀」記錄器仍能找到,特別是向公眾演示時。它們是測量里氏震級必不可少的。
外部連結
- An example seismogram
- REV, the Rapid Earthquake Viewer Seismograms recorded around the world from recent earthquakes (weeks old) as well as larger earthquakes from the past.
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