【作者】 俞言祥； 汪素云； 胡聿贤；

【Author】 Yu Yanxiang, Wang Suyun and Hu Yuxian(Institute of Geophysics, China Seismological Bureau, Beijing 100081 , China)

【机构】 中国地震局地球物理研究所；

【摘要】 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。以中国数字地震台网(CDSN)的宽频带记录为例,介绍了恢复地面运动参数、校正处理的方法。对所记录的信号和噪声的傅里叶谱作了对比分析,以讨论所计算的长周期地震动反应谱的可靠性。分析结果表明,与工程上所使用的数字式加速度强震仪的记录不同,本文所使用的宽频带数字记录可以得出可靠的周期长于10s的地震动反应谱,并且速度型的记录比加速度型的记录有更好的信噪比。对1986年以来70多个地震的CDSN宽频带(BB或VBB)记录、CDSN低增益超短周期(LG)记录和法国Geoscope台网乌什台的宽频带记录作了相应的处理,计算了周期至20s的多个阻尼比的地震动反应谱。更多还原

【Abstract】 In this paper, we use the digital broad-band records to study the characteristics of long-period ground motion. The record of Chinese Digital Seismograph Network (CDSN) is used as an example to demonstrate the method of recovery of the ground motion and correction procedure. We analyzed the signal and noise level in order to discuss the reliability of the calculated long-period response spectrum. The results show that, differ from the strong motion accelero-graphs used in engineering research, the digital broad-band records in this work can be used to obtain credible ground motion response spectra in the period of longer than 10s. The velocity type record have higher signal-to-noise ratio than that of the acceleration type record. The horizontal long-period response spectra of different damping ratio which the period is up to 20 second are calculated.更多还原