深冲积盆地地震场地效应的边界元数值分析
Seismic site effects in a deep alluvial basin: numerical analysis by the boundary element method
摘要：
本文的主要目的是在加拉加斯（委内瑞拉）的地震场地效应的数值分析。在频域中考虑边界元法进行分析。一个数值模型，包括当地地形的一部分被认为是，它涉及一个深冲积层上的弹性基岩。从水平、发生频率和位置等方面分析了地震动（SH波、弱震动）的放大作用。在加拉加斯的这个特定地点，发现放大因子达到最大值25。对于低频（低于1.0 Hz），场地效应发生在盆地最厚的部分，对于1.0 Hz以上的频率，场地效应发生在两个中间较薄的区域。入射和剪切波速度的影响也进行了研究。与微动记录的比较之后。数值和实验方法的结果在盆地最深处的基频方面是一致的。边界元法是分析场地地震效应的一种可靠而有效的方法。
英文摘要：
The main purpose of the paper is the numerical analysis of seismic site effects in Caracas (Venezuela). The analysis is performed considering the boundary element method in the frequency domain. A numerical model including a part of the local topography is considered, it involves a deep alluvial deposit on an elastic bedrock. The amplification of seismic motion (SH-waves, weak motion) is analyzed in terms of level, occurring frequency and location. In this specific site of Caracas, the amplification factor is found to reach a maximum value of 25. Site effects occur in the thickest part of the basin for low frequencies (below 1.0 Hz) and in two intermediate thinner areas for frequencies above 1.0 Hz. The influence of both incidence and shear wave velocities is also investigated. A comparison with microtremor recordings is presented afterwards. The results of both numerical and experimental approaches are in good agreement in terms of fundamental frequencies in the deepest part of the basin. The boundary element method appears to be a reliable and efficient approach for the analysis of seismic site effects.
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