若干世纪以来，人们有许多记录和逸事表明狗、老鼠、蛇和鸡等动物在地震之前行为反常。 本次的发现为这个纪录又添上了一笔。
The finding will add to the accounts through the centuries where animals, from dogs to rats, snakes and chickens, are said to have behaved strangelybefore an earthquake.
地震仪也被用来纪录地层活动，因为在火山附近会有地震反应。
Seismographs are also used to record ground movement with seismic sensors in place around the volcano.
在1906年路奥尔·德姆发现它从他的研究地震的纪录。
In 1906 rd Oldham discovered it from his studies of earthquake records.
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