DAMAGE DUE TO THE 1985 MEXICO EARTHQUAKE AND THE GROUND CONDITIONS
DAMAGE DUE TO THE 1985 MEXICO EARTHQUAKE AND THE GROUND CONDITIONS
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DOI：
10.3208/sandf1972.28.3_149
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发表时间：
1988-09
影响因子：
3.7
通讯作者：
T. Ohmachi;M. Kawamura;S. Yasuda;Chojiro Mimura;Yutaka Nakamura
中科院分区：
文献类型：
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作者：
T. Ohmachi;M. Kawamura;S. Yasuda;Chojiro Mimura;Yutaka Nakamura
本文介绍了1985年9月19日墨西哥米却肯州地震造成的一些损害类型，并根据1986年1月对墨西哥城和震中区的现场调查描述了这些损害与地面条件之间的关系。通过现场调查从墨西哥地震中吸取的教训总结如下。 (1)距震中400公里的墨西哥城遭受了巨大的破坏，这是由于地震动通过被坚硬的火山岩层包围的软湖相粘土沉积物的放大而引发的。 (2) 在震中区，考虑到峰值加速度的记录值为 150 至 170 加仑，对结构的破坏相对较小，因为大多数结构都位于坚固的沿海台地上。只有在冲积低地上发展起来的拉萨罗卡德纳斯市受到了地震的严重袭击。特别是填海区的工厂因液化而受损。 (3) 拉维利塔大坝的微震测量与有限元分析的比较表明，该大坝对地震的反应就像高坝一样，将地基厚度添加到了大坝的高度上。 （4）古兹曼市位于震中西北200公里处，与墨西哥城一样发育在盆地内，大部分房屋和路面都沿着细小的缝隙遭到破坏，这些缝隙被认为与火山地形地下存在的断层有关。
This paper presents some types of the damage caused by the Michoacan, Mexico Earthquake of September 19, 1985 and describes the relations between those damage and their ground conditions based on the site investigation in Mexico City and the epicentral zone in January, 1986. The lessons learned from the Mexico Earthquake through the site investigation, are summarized as follows. (1) Tremendous damage in Mexico City at 400 km distance from the epicenter, was triggered by the amplifications of the ground motions through the soft lacustrine clay deposit which is surrounded by hard volcanic rock formations. (2) At the epicentral zone the damage to structures was relatively small in consideration of the recorded values of the peak acceleration which are 150 to 170 gals because most of structures stand on the firm coastal terrace. Only the City of Lazaro Cardenas, which was developed on the alluvial low ground, were severely attacked by the earthquake. Especially the factories on the reclaimed land were damaged due to the liquefactions. (3) Comparison between the microtremor measurement on La Villita Dam and the FEM analysis suggests that the dam responded to the earthquake as a high dam adding the thickness of the foundation to the height of the dam. (4) In the City of Guzman which is located 200km to the northwest of the epicenter and developed in the basin like Mexico City, most of the houses and pavements were damaged along the small gaps which were considered to relate a fault existing under the ground in the volcanic topography.