VP型垂直摆倾斜仪观测频带的分析及改进  

Research and Improvement of the Observation Band of the Vertical Pendulum Tilt Meter

作　　者：吕品姬[1,2] 李正媛[3] 耿丽霞 李农发 徐春阳 Lü Pinji;LI Zhengyuan;GENG Lixia;LI Nongfa;XU Chunyang(Key Laboratory of Earthquake Geodesy,Institute of Seismology,CEA,40 Hongshance Road,Wuhan 430071,China;Wuhan Base of Institute of Crustal Dynamics,CEA,40 Hongshance Road,Wuhan 430071,China;China Earthquake Networks Center,5 Nanheng Street,Sanlihe,Beijing 100045,China;Wuhan Research Institute of Seismologic Instruments Co Ltd,11 Qinglong Road,Xianning 437000,China)

机构地区：[1]中国地震局地震研究所地震大地测量重点实验室,武汉市430071 [2]中国地震局地壳应力研究所武汉科技创新基地,武汉市430071 [3]中国地震台网中心,北京市100045 [4]武汉地震科学仪器研究院有限公司,湖北咸宁437000

出　　处：《大地测量与地球动力学》2020年第5期540-545,共6页Journal of Geodesy and Geodynamics

基　　金：中国地震局地震研究所基本科研业务费专项和中国地震局地壳应力研究所基本科研业务费专项(IS201526214)。

摘　　要：从仪器原理、传递函数和观测数据等方面分析目前在网进行1 Hz采样的VP型垂直摆倾斜仪在2~60 s周期内的频率特性,认为该仪器可以观测到频带内的信号变化,但因处于过渡带,观测幅度较真实幅度削弱约20~40 dB。对VP型垂直摆倾斜仪观测频带进行拓展,使2~60 s周期内的观测信号由之前的过渡带进入到仪器的通频带,结果与相同采样率的其他定点形变仪器的观测效果相同,将地倾斜观测量转换为加速度表达后,其幅频特性符合全球地震背景噪声模型。改进后的VP型垂直摆倾斜仪对于远距离震级不大的同震体波震相记录效果略优于改进前,但受地脉动影响,在识别非地脉动信号时需要采用更精细的方法和手段来提高识别效果。Research on the instrument principle,transfer function and observation data of the vertical pendulum tilt meter(VPT)in the 2-60 s band shows that the VPT can record the signals in this band.As the band is a transition band,the response of ground motion on the observed data is weakened about 20-40 dB.The VPT’s frequency band is improved in order to expand the signals of the 2-60 s periods in pass-band.The results show the same as other fixed deformation observations with 1 Hz samplings.After transforming the observation into the expression of acceleration,the amplitude-frequency characteristics coincide with global seismic background noise model,which would be a new way to analyze the VPT data.The improved VP vertical pendulum has a slightly better effect on the body phase recording of earthquakes with long distance and medium magnitude than before.However,due to the influence of ground micro-tremor,we need more refined methods to improve the recognition effect in identifying non-ground micro-tremor.

关 键 词：VP型垂直摆倾斜仪 观测频带 采样率 传递函数 

分 类 号：P315[天文地球—地震学]