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首页> 外文期刊>Bulletin of earthquake engineering >Ground motion prediction in Beirut: a multi-step procedure coupling empirical Green's functions, ground motion prediction equations and instrumental transfer functions
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Ground motion prediction in Beirut: a multi-step procedure coupling empirical Green's functions, ground motion prediction equations and instrumental transfer functions

机译：贝鲁特的地震动预测：结合格林经验函数，地震动预测方程和仪器传递函数的多步骤过程

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The strike slip Yammouneh fault is the longest fault in Lebanon, crossing the territory from South to North. It was responsible for major historical earthquakes like the 1202 A.D. earthquake, estimated to M(s)7.6. This paper presents a site-specific estimation of the ground motion caused by a potential M(w)7.5 earthquake on the Yammouneh fault, similar to the 1202 event, for various sites within the Beirut area. The empirical Green's function technique EGF is used to estimate the median and the standard deviations of the seismic ground motion at the reference station BHL, taking into account epistemic and aleatory uncertainties related to source parameters. These uncertainties were quantified through a sensitivity analysis of the position of the rupture nucleation X-nuc, the slip roughness parameter K, the corner frequency f(c) and the magnitude M-c of the EGF. The rock ground motion is then transferred to various other sites within the Beirut area, using instrumental Fourier transfer functions. Site amplification factors are next deduced by computing the ratio between response spectra at sediment sites and at a reference rock station. Considering the limits of the EGF method in the near field of extended sources, the EGF approach is considered only up to a magnitude M-w of 6.5. Selected Ground Motion Predictive Equations are then used to simulate a M(w)7.5 event at a reference station. By applying the amplification factors, the response spectra at the different sites of Beirut are also calculated and compared with the actual response spectra used in the Lebanese regulations.
机译：罢工Yammouneh断层是黎巴嫩最长的断层，从南到北穿越该领土。它造成了重大历史地震，例如公元1202年地震，估计为M（s）7.6。本文针对贝鲁特地区内的各种地点，对Yammouneh断层上潜在的M（w）7.5地震引起的地面运动进行了特定地点的估计，类似于1202事件。考虑到与震源参数有关的认识和不确定不确定性，经验格林函数技术EGF用于估算参考站BHL地震地震动的中值和标准偏差。这些不确定性通过对破裂形核X-nuc的位置，滑动粗糙度参数K，转角频率f（c）和EGF的大小M-c进行敏感性分析来量化。然后，使用仪器傅里叶传递函数将岩石地震动传递到贝鲁特地区的其他各个地点。接下来，通过计算沉积物站点和参考岩石站点的响应谱之间的比率来推导站点放大因子。考虑到EGF方法在扩展源近场中的局限性，仅将EGF方法考虑到M-w到6.5的幅度。然后，使用选定的地面运动预测方程式来模拟参考站处的M（w）7.5事件。通过应用放大因子，还可以计算贝鲁特不同地点的响应光谱，并将其与黎巴嫩法规中使用的实际响应光谱进行比较。

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