河北VP型宽频带垂直摆倾斜仪映震效能及时频特征分析  

Analysis of Reflecting Earthquake Efficiency and Time Frequency Characteristics of the VP Broadband Vertical Pendulum Tiltmeters in Hebei Province

作　　者：马武刚[1,2,3] MA Wugang(Institute of Seismology,CEA,Wuhan 430071,China;Key Laboratory of Earthquake Geodesy,CEA,Wuhan 430071,China;Hubei Earthquake Agency,Wuhan 430071,China)

机构地区：[1]中国地震局地震研究所,武汉市430071 [2]中国地震局地震大地测量重点实验室,武汉市430071 [3]湖北省地震局,武汉市430071

出　　处：《大地测量与地球动力学》2022年第6期643-649,共7页Journal of Geodesy and Geodynamics

基　　金：湖北省自然科学基金(2019CFB768);中国地震局地震研究所和应急管理部国家自然灾害防治研究院基本科研业务费专项(IS201926300)。

摘　　要：利用河北地区8套VP型宽频带垂直摆倾斜仪的连续观测资料,从映震特征及映震能力等方面讨论其映震效能,并对其时频响应特征进行分析。结果显示:1)河北地区宽频带垂直摆倾斜仪的映震能力与震级和震中距正相关,与震源深度负相关(崇礼台除外);对于同一地震而言,各台站震中距的远近与仪器映震能力相关性不大。2)8套仪器均能记录到较为完整的远震地震波信息,从波形上能够清晰看到P波与S波的起始时刻。3)时频分析结果显示,仪器能够记录到较为完整的面波信号,但受采样率的限制,体波(P波和S波)信号记录不全,无法记录到0.5 Hz以上的信号。4)由于厂家修改了崇礼台仪器的高端截止频率参数,调整后仪器记录的高频成分增多,信噪比降低,对浅源地震的映震效能产生了与其他仪器相反的结论,对该仪器参数的修改结果需作进一步验证。Based on the continuous observation data of 8 sets of VP broadband vertical pendulum tiltmeters in Hebei province,the paper analyzes reflecting-earthquake characteristics,reflecting-earthquake ability and time-frequency characteristics,and discusses the reflecting-earthquake efficiency of broadband vertical pendulum tiltmeters in Hebei province.The results show that:1)The reflecting-earthquake capacity of broadband vertical pendulum tiltmeter in Hebei area is directly proportional to the magnitude,inversely proportional to the focal depth(except Chongli station),and has little correlation with the epicentral distance.2)All instruments can record relatively complete teleseismic seismic waves,and the starting time of P wave and S wave can be seen clearly from the waveform diagram.3)The time-frequency analysis shows that the instrument can record relatively complete surface wave signals,but due to the limitation of sampling rate,the body wave(P and S wave)signals are not fully recorded,and the signals above 0.5 Hz cannot be recorded.4)Due to the modification of instrument parameters by the manufacturer,Chongli station has obvious difference in signal response ability in high-frequency part from other station instruments,and can record more high-frequency signals.However,the reflecting-earthquake efficiency of shallow source earthquakes is contrary to that of other instruments.Therefore,the modification results of instrument parameters need to be further verified.

关 键 词：VP型宽频带垂直摆倾斜仪 映震效能 时频响应特征 频带宽度 

分 类 号：P315[天文地球—地震学]