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基于谱比法,以台站记录地震波频谱为观测数据,通过扣除仪器响应及几何扩散后同一地震不同台站记录谱比,扣除震源方向性、震源因子的影响,在此基础上,建立数学模型通过联合反演求解场地效应及地震波衰减参数.以浙江省地震台网台站记录的台湾地震数字化地震波资料为基础,使用地震波记录中的Lg波,评估浙江省台网丘陵地带基岩台站场地效应,计算穿越台湾海峡较单一路径Lg波衰减参数.研究使用20次发生于2002—2005年、震级在MS5.0~6.7之间的台湾东北部较小区域地震,参与评估台站16个,地震波记录960条.地震波处理频段为0.5~10.0Hz,每间隔0.2Hz计算一次,对应于垂直、东西及南北分量获得的衰减参数,数据结果分别为:γ(f)=0.00175f0.43485,γ(f)=0.00145f0.48467,γ(f)=0.0021f0.41241.庆元台(QIY)在1.5Hz以上放大效应非常明显,宁波台(NIB)在大部分频率点场地效应最小,参与评估台站场地效应各分向基本相当,未表现出方向性特征.
Based on the spectral ratio method, the observational data of the seismic wave recorded by the station was used. By subtracting the instrument response and the spectral distribution ratio of different stations in the same earthquake after geometry diffusion, the influence of source direction and source factor was deducted. On this basis, the mathematical model Through the joint inversion, the site effects and the seismic attenuation parameters are solved. Based on the seismic data of Taiwan earthquake recorded by Zhejiang Seismological Station, Lg waves in seismic records are used to assess the locations of the bedrock stations in Zhejiang Province Effect to calculate Lg wave attenuation parameters over a single path across the Taiwan Strait.Study 20 small earthquakes occurred in northeastern Taiwan between 20 and 200 in MS5.0 ~ 6.7 with magnitude between 2002 and 2005, involved in the evaluation of 16 stations, The seismic wave records 960. The seismic wave processing frequency band is 0.5-10.0Hz, calculated once every 0.2Hz, corresponding to the attenuation parameters obtained by the vertical, east, west and north-south components, the data results are respectively as follows: γ (f) = 0.00175f0.43485, γ (f) = 0.00145f0.48467, γ (f) = 0.0021f0.41241. The amplification effect of QIY at 1.5Hz and above is very obvious. The NIB has the least site effect in most frequency points and is involved in the assessment Station The site effects are basically the same in all directions and do not show the directional characteristics.