汶川地震泉州台强震仪与地震仪的记录分析

RECORDS ANALYSIS OF STRONG-MOTION SEISMOGRAPH AND SEISMOGRAPH OF WENCHUAN EARTHQUAKE BY QUANZHOU SEISMOSTATION

对安装在泉州地震台的SLJ-100型加速度计强震仪和CTS-1型地震仪记录到的汶川Ms8.0地震波进行对比。结果显示:1)在频谱方面,两种仪记录在0.012～2 Hz内基本一致,在低频段由于仪器响应不同存在差异;2)波形和相对位移反应谱方面,经基线校正和带通滤波后的两种记录呈现相当高的一致性;300 s周期内的相对位移反应谱表明,基线校正并没有引入不可接受的长周期噪声干扰。

Seismic waves of the Ms8.0 Wenchuan earthquake were compared which were recorded the strong-motion seismograph （SLJ-100 accelerometer） and the seismograph （CTS-1 seismometer） in by Both of Quanzhou Seismostation seismostationrecorded relatively complete seismic waves of Wenchuan earthquake （ May 12, 2008）. In order to carry out a comprehensive comparative analysis of two types of records, the author first does baseline correction and bandpass filtering in the 20 Hz ~ 120 s by using SLJ-100 accelerogram. The results show that： 1 ） Viewed from spectrum, strong-motion seismograph records and seismograph records are almost the same from the rangein of 0.012 Hz to 2 Hz. The differences lie in the low-frequency and the high-frequency due to different in- strument response and instrument noise respectively. 2）Viewed from wave form and relative displacement, the re- cords of SLJ-100 and CTS-1 show relatively high consistency after baseline correction and band pass filtering. These indicate that from high-accuracyaccelerogram integral to speed and displacement trough baseline correction is feasible. The 300 s cycle relative displacement response spectrum shows that baseline correction does not introduce unacceptable long period noise.