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Vrancea Source Influence on Local Seismic Response in Bucharest

机译：Vrancea源对布加勒斯特局部地震响应的影响

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— The mapping of the seismic ground motion in Bucharest, due to the strong Vrancea earthquakes, is carried out using a complex hybrid waveform modeling method that allows easy parametric tests. Starting from the actually available strong motion database, we can make realistic predictions for the possible ground motion. The basic information necessary for the modeling consists of: (a) The representative mechanisms for the strong subcrustal events, (b) the average regional structural model, and (c) the local structure for Bucharest. Two scenario earthquakes are considered and the source influence on the local response is analyzed in order to define generally valid ground motion parameters, to be used in the seismic hazard estimations. The source has its own (detectable) contribution on the ground motion and its effects on the local response in Bucharest are quite stable on the transversal component (T), while the radial (R) and vertical (V) components are sensitive to the scenario earthquake. Although the strongest local effects affect the T component, both observed and synthetic, a complete determination of the seismic input for the built environment requires the knowledge of all three components of motion (R, V, T). The damage observed in Bucharest for the March 4, 1977 Vrancea event, the strongest earthquake to strike the city in modern times, is in agreement with the synthetic signals and local response.
机译：—由于强烈的Vrancea地震，布加勒斯特地震地震动的绘图是使用复杂的混合波形建模方法进行的，该方法可以轻松进行参数测试。从实际可用的强运动数据库开始，我们可以对可能的地面运动做出现实的预测。建模所需的基本信息包括：（a）强烈的亚壳事件的代表性机制；（b）平均区域结构模型；（c）布加勒斯特的局部结构。考虑了两次情景地震，并分析了震源对局部响应的影响，以定义通常有效的地震动参数，以用于地震危险性估计中。该源对地面运动有其自己的（可检测的）贡献，并且其对布加勒斯特的局部响应的影响在横向分量（T）上非常稳定，而径向分量（R）和垂直分量（V）对场景很敏感地震。尽管最强烈的局部影响会影响T分量（无论是观察到的还是合成的），但要完全确定建筑环境的地震输入，需要了解运动的所有三个分量（R，V，T）。布加勒斯特在1977年3月4日发生的Vrancea事件中所观察到的破坏是现代发生在该市的最强烈地震，这与综合信号和当地反应一致。

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