文章摘要

文章信息/Info

Title:: Study on Discrepancy of HVSR Spectrum Ratios of Different Seismic Phase Components Based on Different Strong Motion Records

Author(s):: ZHANG Hexiang¹; LI Hongguang²; (1.Foundation Department Institute of Disaster Prevention,China Earthquake Administration,Sanhe 065201,Hebei,China)(2.Engineering Department National Earthquake Response Support Service,Beijing 100049,Hebei,China)

Keywords:: Site-effects; Horizontal-to-Vertical Spectral Ratio; seismic phase; Strong Motion Records; Wenchuan earthquake

摘要:: 使用6个强震台站记录的2008年汶川8.0级地震强震记录,通过对比强震记录中各波动成份的HVSR谱比结果,分析了各波动成份对场地地震效应分析结果的影响; 根据各波动成份的水平向和垂直向傅里叶谱结果,初步解释了各波动成份HVSR谱比结果不同的原因,并指出了HVSR谱比方法在强震记录和地脉动记录中应用的区别和联系。结果表明:强震记录中由于包含了震源特性和路径信息,故其HVSR谱比结果与地脉动的结果有明显的区别,建议在使用强震记录进行HVSR谱比分析场地地震效应时,尽量使用全波波形进行谱比研究。

Abstract:: Based on the earthquake records of the 2008 M8.0 Wenchuan earthquake recorded by six strong motion stations,we compare and analyze their HVSR spectral ratio results,and study on the effects of HVSR spectral ratio method in analysis site-effects with each seismic phase of the strong motion records.According to the horizontal and vertical Fourier spectrum of each seismic phase,we try to explain the difference and relationship between the strong motion records and microtremor records who using the HVSR spectral ratio method to analyze the site-effects.Finally,we give some suggestions in the use of strong earthquake records with the method of the HVSR spectral ratio.The results show that,due to the inclusion of the source characteristics and path information,the HVSR spectral ratio results of strong motion records and microtremor results have obvious differences,so when using the HVSR spectral ratio in analysis of site-effects caused by strong motion records,It is suggested that the full-wave recording of the strong motron rewrds be sued to study HVSR spetral ratio.