GL-CS120和JS-120型地震计性能及记录数据相干性分析  

Performance and Record Data Coherence Analysis of GL-CS120 and JS-120 Seismometers

作　　者：吴双 朱成林[1] 崔华伟[1] 胡旭辉[1] 王杰民[1] WU Shuang;ZHU Chenglin;CUI Huawei;HU Xuhui;WANG Jiemin(Shandong Earthquake Agency,Jinan 250014,China)

机构地区：[1]山东省地震局,济南250014

出　　处：《华南地震》2024年第4期55-65,共11页South China Journal of Seismology

基　　金：山东郯城巨震区低速率挤压逆冲构造野外科学观测研究站和喜马拉雅东构造结震源机制及应力场研究项目(NORSLS23-02)。

摘　　要：GL-CS120和JS-120型甚宽频带地震计在国内使用较为广泛,也是“国家烈度速报与预警工程项目——山东子项目”新建基准站目前所使用的两种地震计型号,但两种型号地震计在性能和各类指标上均存在差异。通过在同一台基上安装GL-CS120和JS-120两种型号地震计,对相同频点记录的数据进行对比分析,计算其动态观测范围、地震计自噪声和不同时段记录数据的相干性。结果显示,两种型号地震计均具有良好的自噪声特性。在相同环境下,两种型号地震计在低频(1-10 s)范围内记录数据的相干性较高,在长周期(10-100 s)和高频(>1 Hz)范围内的相干性均存在差异,受外界环境影响较大。GL-CS120 and JS-120 very broadband seismometers are widely used in China.They are also used in the new base station of the“National Seismic Intensity and Rapid Reporting and Early Warning Project—Shandong Sub-Project”.However,there are differences in performance and various indicators between the two types of seismometers.In this study,GL-CS120 and JS-120 seismometers were installed on the same base,and the data recorded at identical frequenciesare were compared and analyzed.The dynamic observation range,self-noise of the seismometers,and coherence of data recorded at different periods were subsequently calculated.The results indicate that both types of seismometers exhibit favorable self-noise characteristics.In the same environmental condition,the coherence of data recorded by the two types of seismometers is high in the low frequency range(1–10 s),while differences in coherence are observed in the long period(10-100 s)and high frequency range(>1 Hz),which are significantly influenced by external factors.

关 键 词：GL-CS120 JS-120 相干性 自噪声 

分 类 号：P315.6[天文地球—地震学]