泉州地震台数字地震仪的监测能力分析

Analysis on Earthquake Monitoring Capability of Digital Seismographs at Quanzhou Seismic Station

为了解泉州台数字地震仪对全球地震的监测能力,利用目前各类仿真记录的震级计算公式及近年泉州台台基的地动噪声有效值,结合各区域震相识别经验等设定了可检测地震的首至P波震相振幅、S波和面波的最大振幅与台基地动噪声有效值的比值,并分别计算和分析了泉州台甚宽频带数字地震仪仿短周期(DD-1仪)记录的近震监测能力、仿中长周期(DK-1仪)记录的远震监测能力及仿长周期(763仪)记录的远震和极远震监测能力。结果表明在100 km、1 000 km、130°和全球范围内,一般可分别可监测到ML1.5级、ML3.7级、MS6.1级和MS7 6.1级的地震。有关研究结果对寻求提高泉州台测震观测质量的技术途径等方面具有实际的意义。

To know the global earthquake monitoring capabilities of digital seism ograph at QZH station,using magnitude formula of the current various simulation records and the effective values of ground noise of digital seismic site at QZH station in recent years,and combing with experience of regional seismic phase identification etc,we set the ratio of the amplitudes of the first arrival P wa ve seismic phase,the maximum amplitude of S wave and surface wave,and the ef fective values of site ground noise,and respectively calculate and analyze near earthquake monitoring capability of simulate short-period（DD-1 seismograph）re cord,teleseismic monitoring capability of the simulation middle-long period（DK-1 seismograph）record and teleseismic to very distant earthquake monitoring cap ability of the simulation long period（763 seismograph） record by the very broa dband digital seismograph at QZH station.In the range of 100 km,1 000 km,130 ° and the globe,it can monitor the earthquake of ML1.5,ML 3.7,MS6.1 and MS7, respectively.The research results have practical significance to seek and impr ove the quality of seismic observations at QZH station.