n.震動(dòng)圖
The magnitude of an earthquake is determined from the logarithm of the amplitude of waves recorded on a seismogram at a certain period. 地震級(jí)別是根據(jù)某一時(shí)期震動(dòng)圖記錄的地震波振幅的對(duì)數(shù)值計(jì)算的。
