苏北测震台网地面和井下地震记录波形频谱分析  

Feature analysis on seismic wave spectrum from ground and underground records by seismic stations in Jiangsu Province

作　　者：仇中阳[1] 毛华峰 陈健[1] 胡米东 

机构地区：[1]淮安地震台,中国江苏223001 [2]溧阳地震台,中国江苏233333

出　　处：《地震地磁观测与研究》2014年第3期105-111,共7页Seismological and Geomagnetic Observation and Research

基　　金：中国地震局"三结合"课题

摘　　要：根据苏北测震台网地面台站和深井台站记录的地震波形资料,分析2009年10月以来台网附近M_L≥2.8地震波频谱特性。分析可知:地面记录与井下记录的地震波频谱特性存在一定差异,地面记录地震波拐角频率较井下约大0.28 Hz,地震波峰值频率比井下约小0.22 Hz;对于M_L>4.5地震,地面记录地震波的优势频率范围小于井下记录;地震矩和矩震级地面台站记录数值较大,差值分别为3.104×10^(14)N·m和0.32级。This paper analyzes the characters of seismic wave′s spectrum which above ML 2.8 since October 2009,on records from both ground and underground instruments of stations in the north of Jiangsu province.From which we can find a deviation in the seismic wave′s spectrums between ground and underground records.The seismic wave′s corner frequency from the ground records are higher than the underground ones about 0.28 Hz,but the peak frequency are less than the underground records about 0.22 Hz,and the dominant frequency are also less.In addition,The seismic moment and moment magnitude from the ground records are higher than the underground ones 3.104×10 ^14 N·m and 0.32.

关 键 词：地面记录与井下记录 频谱特性 拐角频率 地震矩 矩震级 

分 类 号：P315.7[天文地球—地震学]