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首页> 外文会议>World conference on earthquake engineering >USE OF 3-D GROUND MOTION SIMULATIONS IN ESTIMATING FUTURE ECONOMIC LOSS IN MEXICO CITY
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USE OF 3-D GROUND MOTION SIMULATIONS IN ESTIMATING FUTURE ECONOMIC LOSS IN MEXICO CITY

机译：在墨西哥城估算未来经济损失时的使用在估算3D地面运动模拟

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摘要

The 1985 Michoacán earthquake highlighted the seismic risk in Mexico City posed by large magnitude (M>7) earthquakes at the subduction interface off the Pacific Coast of Mexico. Although more than 300 km away from the 1985 earthquake, Mexico City suffered a disproportionate amount of overall damage and loss, especially in the lakebed region. Extensive research conducted since the Michoacán earthquake has allowed a better understanding of seismic damage potential in Mexico City. However, many challenges remain in characterizing: a) ground motion attenuation in the region, b) seismic response of soft sediments underneath the city, and c) seismic vulnerability of the ever-changing building stock in the city. In this study, loss estimates for Mexico City were carried out for a selected scenario earthquake at the subduction interface off the Pacific Coast of Mexico. Instead of the conventional method, which uses empirical attenuation relationships combined with site amplification factors, we adopted comprehensive 3-D source-to-site simulations to model the ground motions. These simulations allowed a more thorough consideration of source characteristics and the complexity of seismic wave propagation from the subduction zone through the Trans-Mexican Volcanic Belt and into the Valley of Mexico. The soft sediments underlying Mexico City were represented by a finer mesh in the simulations in order to better capture the basin effects. The simulations provided ground motion time series at the surface, enabling the consideration of duration effects as well as other time and frequency domain characteristics of the resulting ground motions. In order to estimate the impact of the simulated ground motions on the buildings in Mexico City, a database of buildings exposed to the earthquake threat was compiled. Seismic vulnerability of buildings was characterized by analytical modeling of various local building types and by synthesizing damage reports from past local earthquakes. We present preliminary results from ground motion simulations of a selected scenario event and their impact on the current building stock in Mexico ity in terms of damage and economic loss.
机译：1985年的Michoacán地震突出了墨西哥城（M> 7）地震所造成的墨西哥城地震的地震风险，在墨西哥太平洋海岸的俯冲界面。距离1985年的地震超过300公里，墨西哥城遭受了不成比例的整体损害和损失，特别是在湖床地区。自Michoacán地震以来进行了广泛的研究，允许更好地了解墨西哥城的地震损伤潜力。然而，许多挑战仍然存在于特征：a）地区的地面运动衰减，b）城市中软沉积物的地震响应，以及C）在城市中不断变化的建筑物股票的地震脆弱性。在这项研究中，在墨西哥太平洋海岸的俯冲界面进行了墨西哥城的损失估计。而不是使用经验衰减关系与现场放大因子相结合的传统方法，我们采用了全面的3-D源进站模拟来模拟地面运动。这些模拟允许更加深入地考虑到源特征的源特征和通过跨墨西哥火山带和墨西哥山谷从俯冲区的地震波传播的复杂性。墨西哥城的软沉积物由模拟中的一个更精细的网格表示，以便更好地捕获盆地效果。该模拟在表面提供地面运动时间序列，从而考虑了所得地运动的持续时间效应以及其他时间和频域特性。为了估算模拟地面运动对墨西哥城建筑物的影响，编制了暴露于地震威胁的建筑物数据库。通过各种局部建筑类型的分析建模以及通过综合过去局部地震的损伤报告的抗震脆性的特征在于建筑物的地震脆弱性。在损害和经济损失方面，我们提出了选定情景事件的地面运动模拟及其对当前建筑物股票的影响。

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