地震研究

采用日本KiK-net台网中9个台站的实测场地模型及多个地震的强震观测记录等数据,对HVSR方法应用于强震数据时“基岩处水平-竖向谱比为1”的假定进行了讨论,并探讨了利用不同系数计算场地水平传递函数TFH的差异,最后对表征不同TFH差异的系数进行了相关性分析。结果表明:强震观测数据揭示的基岩内水平-竖向谱比不一定为1,仅在某一频率范围内可以视为一个常数; 表征用不同TFH差异的系数C取为1〖JB<1/〗(2αB/βB)1/2时,计算得到的水平向传递函数与实际观测得到的水平向经验传递函数一致性较好; HVSRB与1〖JB<1/〗(2αB/βB)1/2在所考虑的频率范围内存在一定的弱相关性。

Firstly, using the measured data of 9 stations in the Japan KiK-net network and the strong earthquake observation records of several earthquakes, we discussed the assumption that ‘the horizontal-vertical spectral ratio of bedrock is 1' when HVSR method is applied to strong earthquake data. Secondly, on this basis, we calculated the differences between the TFH of the site horizontal transfer function by using different coefficients. Finally, the correlation coefficients of the TFH differences calculated by different formulas are analyzed. The results show that the horizontal-to-vertical spectral ratio in the bedrock revealed by the strong earthquake observation data is not necessarily 1, and can be regarded as a constant only in a certain frequency range. When the coefficient C which is used to estimate the difference of TFH with different formulas is taken as 1/(2αB/βB)1/2, the theoretically calculated horizontal transfer function is in good agreement with the actual observed horizontal transfer function. There is a certain weak correlation between HVSRB and(2αB/βB)1/2 in the frequency range considered.

引言
1 数据选取
2 数据处理与统计分析
3 HVSR_B的取值讨论
4 对合成的水平分量HVSR_B和(2α_Bβ_B)^1/2相关性的探讨
5 结论

图1 9个台站钻孔柱状图及基岩处传感器深度位置<br/>Fig.1 Drilling histogram and sensor depth position at bedrock of 9 stations

图1 9个台站钻孔柱状图及基岩处传感器深度位置
Fig.1 Drilling histogram and sensor depth position at bedrock of 9 stations

表1 9个台站记录到的地震事件的相关参数<br/>Tab.1 Relavent parameters of seismic events recorded at 9 stations

表1 9个台站记录到的地震事件的相关参数
Tab.1 Relavent parameters of seismic events recorded at 9 stations

图2 所记录地震的震级、震中距分布图<br/>Fig.2 Magnitude-epicentral distance distribution map of the recorded earthquakes

图2 所记录地震的震级、震中距分布图
Fig.2 Magnitude-epicentral distance distribution map of the recorded earthquakes

图3 9个台站NS方向、EW方向和合成的水平分量HVSRB谱比曲线<br/>Fig.3 HVSR spectral ratio curves in NS and EW directions and synthetic horizontal component at base rocks of 9 stations

图3 9个台站NS方向、EW方向和合成的水平分量HVSRB谱比曲线
Fig.3 HVSR spectral ratio curves in NS and EW directions and synthetic horizontal component at base rocks of 9 stations

图4 根据式(4)、(5)、(7)计算得到的9个台站的TFH曲线<br/>Fig.4 TFH curves of 9 stations calculated by equations(4),(5),and(7)

图4 根据式(4)、(5)、(7)计算得到的9个台站的TFH曲线
Fig.4 TFH curves of 9 stations calculated by equations(4),(5),and(7)

图5 9个台站2个水平分量HVSRB的均方根与(2αBβB)1/2的相关性<br/>Fig.5 Correlation between root mean square roots of two horizanal components HVSRB and (2αBβB)1/2 of 9 stations

图5 9个台站2个水平分量HVSRB的均方根与(2αBβB)1/2的相关性
Fig.5 Correlation between root mean square roots of two horizanal components HVSRB and (2αBβB)1/2 of 9 stations

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备注

引言

1 数据选取

2 数据处理与统计分析

3 HVSR_B的取值讨论

4 对合成的水平分量HVSR_B和(2α_Bβ_B)^1/2相关性的探讨

5 结论

期刊信息

备注

引言