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地震记录仪器由20年代的1道发展到80年代初的1000多道,60年来增加了1000倍。道数的增长趋势是直线性的,40年代出现24道仪器,50年代出现48道仪器,60年代末出现96道仪器,基本上是十年翻一番,而70年代则由96道增加到192、240乃至384道,翻了不止一番,80年代初的三年中仪器道数已由384而至576乃至1024道,最近舍赛尔公司又推出了号称万道的仪器。因此,近年来地震仪的道数增加的势头不仅不衰,似乎更快
Seismographs developed from 1 in the 1920s to more than 1,000 in the early 1980s, an increase of 1000 times in 60 years. There are 24 instruments in the 1940s, 48 instruments in the 1950s and 96 instruments in the late 1960s, which basically doubled in 10 years, and increased from 96 to 70 in the 1970s 192,240 and even 384 more than doubled. The number of instruments in the three years from the early 1980s was 384 to 576 or even 1,024. Recently, the company called its 10,000-unit instrument. Therefore, the trend of increasing the number of seismographs in recent years is not only not bad, it seems faster