直接使用FFT由数字地震记录来恢复地面位移可能产生包括虚假的长周期分量在内的不正确结果。
It is possible to yield incorrect results including false long period components, during the restitution of the ground displacement from digital seismograms directly using FFT.
本文将数字台网建立以来在使用数字地震记录仪中遇到的仪器设备故障及环境对仪器设备的影响加以总结。
The paper summarized the instrument device failure and environment's influence on instrument devices since the foundation of digital seismic network.
为研究长周期地震动反应谱特性，本文首次采用了地震学研究所使用的宽频带数字地震记录作为数据基础。
In this paper, we use the digital broad-band records to study the characteristics of long-period ground motion.
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