The strain seismograms of P- and S-waves of a local event recorded by four-gauge borehole strainmeter  

作　　者：Zehua Qiu Shunliang Chi Zhenming Wang Seth Carpenter Lei Tang Yanping Guo Guang Yang 

机构地区：[1]Institute of Crustal Dynamics, China Earthquake Administration [2]Earthquake Administration of Hebi [3]Kentucky Geological Survey, University of Kentucky [4]Guza Seismic Station, Earthquake Administration of Sichuan Province

出　　处：《Earthquake Science》2015年第3期209-214,共6页地震学报（英文版）

基　　金：supported by the Special Fund for Earthquake Research in the Public Interest(No.201108009)

摘　　要：At a sampling rate of 100 samples per second,the YRY-4 four-gauge borehole strainmeters（FGBS） are capable of recording transient strains caused by seismic waves such as P and S waves or strain seismograms. At such a high sampling rate, data from the YRY-4 strainmeters demonstrate fairly satisfactory self-consistency. The strain tensor seismograms demonstrate the senses of motion of P waves, that is, the type of seismic wave travels in the direction of the maximum normal strain change. The observed strain patterns of S waves significantly differ from those of P waves and should contain information about the source mechanism. Spectrum analysis shows that the strain seismograms are consistent with conventional broadband seismograms from the same site.At a sampling rate of 100 samples per second,the YRY-4 four-gauge borehole strainmeters（FGBS） are capable of recording transient strains caused by seismic waves such as P and S waves or strain seismograms. At such a high sampling rate, data from the YRY-4 strainmeters demonstrate fairly satisfactory self-consistency. The strain tensor seismograms demonstrate the senses of motion of P waves, that is, the type of seismic wave travels in the direction of the maximum normal strain change. The observed strain patterns of S waves significantly differ from those of P waves and should contain information about the source mechanism. Spectrum analysis shows that the strain seismograms are consistent with conventional broadband seismograms from the same site.

关 键 词：Four-gauge borehole strainmeter（FGBS） Strain seismogram P-wave S-wave Self-consistency Spectrum analysis 

分 类 号：P315.31[天文地球—地震学]