江西地震预警台网测震仪、强震仪及烈度仪记录噪声与地震事件分析比较  

Analysis and comparison of noise and seismic events recorded by seismometers,strong seismometers and intensity meters of Jiangxi EarthquakeEarly Warning Network

作　　者：董俊 项月文 李清武 Dong Jun;Xiang Yuewen;Li Qingwu(Observatory for Geodynamic of the East Yangtze Block in Jiujiang,Jiangxi Province,Jiangxi Jiujiang 332006,China;Jiangxi Earthquake Agency,Jiangxi Nanchang 330026,China)

机构地区：[1]江西九江扬子块体东部地球动力学野外科学观测研究站,江西九江332006 [2]江西省地震局,江西南昌330026

出　　处：《地震科学进展》2023年第8期367-373,共7页Progress in Earthquake Sciences

基　　金：江西九江扬子块体东部地球动力学野外科学观测研究站开放基金(0GYB202002)资助。

摘　　要：根据对江西地震预警台网使用的3种型号(测震仪、强震仪和烈度仪)仪器的记录数据计算分析,获得站址背景噪声RMS值和功率谱曲线。结果表明:测震仪能够有效地记录较宽频带内背景噪声,而强震仪只能记录大于0.1 Hz的自然噪声;相比之下,烈度仪记录仅仅是设备本身噪声,无法有效记录地脉动。3种类型仪器都能有效记录到大的地震事件,通过P波初动识别进行地震定位,而震级测定时,强震仪和烈度仪分析结果比测震仪明显偏大,实际应用时仅作参考。Based on the analysis of the observation records from the three devices used by the Jiangxi Earthquake Early Warning Network(seismometer,strong seismometer,and intensity meter),the RMS value and power spectrum of the station site background noise indicate that the seismometer can effectively record the background noise in a wide frequency domain,while the strong seismometer can only effectively record natural noise above 0.1 Hz.In contrast,the intensity meter only records the noise of the device itself,and cannot effectively record microtremor.However,all three kinds of instruments can effectively record seismic events,and can be used for seismic location through the identification of initial movement of P wave.However,when determining the magnitude,the results of strong seismometer and intensity meter will be significantly larger than those of seismometer,so they are only used for reference in practical application.

关 键 词：江西地震预警台网 仪器 背景噪声 地震事件分析 

分 类 号：P315.62[天文地球—地震学]