因此，火山学专家的任务，就是观测火山以及它的地震活动，这对救人来说至关重要。
Thus the work which vulcanologists undertake, monitoring volcanoes and their seismic activity, is crucial to saving lives.
目的是供从事或将要从事数字地震学观测、析和研究的同志参考。
It provided the reference for colleagues who are engaged in the observation and analysis and research of digital seismology.
如何精确地测定地震观测系统的频谱特性，是测震学中的一项重要课题。
The problem of accurately measure the spectral characteristics of a seismic observational system is an important subject of investigation in seismology.
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