Mexico City Basin Effects: Past, Present, and Future

Mexico City Basin Effects: Past, Present, and Future
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墨西哥城盆地效应:过去、现在和未来

DOI:
10.1061/9780784482100.043
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发表时间:
2019
期刊:
Eighth International Conference on Case Histories in Geotechnical Engineering
影响因子:
--
通讯作者:
Hutchinson, Tara
Hutchinson, Tara
中科院分区:
--
文献类型:
--
作者:
Asimaki, Domniki;Villa, Juan Mayoral;Ayoubi, Peyman;Franke, Kevin;Hutchinson, Tara

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由场地效应控制的墨西哥城地震危险。1985年的M8.1俯冲带地震,在震中距离350公里处造成了重大的破坏和数千人的生命损失,已经成为场地效应在改变地震的振幅、频率和持续时间以及加剧地震灾难性后果方面所起作用的典型例子。我们在这里介绍了对2017年9月19日M7.1事件的观察和分析,该事件虽然由1985年事件震中距离相对于墨西哥城的一半左右的板内破裂引发,但对位于盆地丘陵和湖泊区域之间相对狭窄区域的数十座建筑物造成了严重的结构性破坏,称为过渡区。我们发现,M7.1主震暴露了1985年前过渡区建筑规范的脆弱性;但更重要的是,突出了1987年建筑规范修订版在现代高层建筑性能方面的改进,这些建筑在1985年米却肯地震序列中遭受了灾难性的后果。接下来,我们分析了过去20年来在盆地各站收集的几个记录。我们强调的重要性,三维非均匀性的盆地沉积物,水文环境和现场响应之间的耦合和随时间的演变,以及深盆边缘和浅粘土层之间的能量相互作用。所展示的结果是GEER团队的集体努力,这些团队在2017年9月19日M7.1地震序列发生后,在震中地区和墨西哥城的受影响地区进行震后侦察。
Seismic hazard in Mexico City governed by site effects. The M8.1 1985 subduction zone earthquake, which caused significant damage and loss of thousands of lives at 350 km epicentral distance, has become the quintessential example of the role that site effects can play in modifying the amplitude, frequency, and duration of ground shaking; and in aggravating the catastrophic consequences of earthquakes. We here present observations and analyses of the M7.1 September 19, 2017, event that—while triggered by an intraplate rupture at approximately half the epicentral distance of the 1985 event relative to Mexico City—caused severe structural damage to a few tens of buildings located in a relatively narrow zone between the hill and lake zones of the basin, known as the transition zone. We show that the M 7.1 mainshock exposed the vulnerabilities of the pre-1985 building code in the transition zone; but more importantly highlighted the improvement of the 1987 building code revision in terms of the performance of modern high-rise buildings that suffered catastrophic consequences during the 1985 Michoácan earthquake sequence. We next analyze several records collected at stations in the basin over the past 20 years. We highlight the importance of three-dimensional heterogeneity of the basin sediments, the coupling between hydrological setting and site response and their evolution with time, and the energy interaction between the deep basin edge and the shallow clay layers. Results presented are the collective effort of the GEER teams that were deployed to perform post-earthquake reconnaissance in the affected regions of the epicentral area and in Mexico City after the M 7.1 September 19, 2017, earthquake sequence.
墨西哥中部的板状地震:峰值地面运动参数和响应谱
DOI: --
发表时间: 2005
期刊:
影响因子: --
作者:
D. García;S. K. Singh;M. Herraiz;M. Ordaz;J. Pacheco
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1931 年墨西哥瓦哈卡地震:俯冲科科斯板块中的岩石圈正断层
DOI: --
发表时间: 1985
期刊: Nature
影响因子: 64.8
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尾波和横波频谱比的比较作为旧金山湾南部地区场地响应的估计
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发表时间: 1994
期刊:
影响因子: --
作者:
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DOI: --
发表时间: 1989-12
影响因子: 3
作者:
M. Campillo;J. Gariel;K. Aki;F. Sánchez-Sesma
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墨西哥瓦哈卡州莱昂华华潘地震,1980 年 10 月 24 日
DOI: --
发表时间: 1984
期刊:
影响因子: --
作者:
J. Yamamoto;Z. Jiménez;R. Mota
通讯作者: R. Mota