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首页> 外文期刊>Geofisica internacional >Mapping Geologic Interfaces that may alter seismic wave propagation in the Mexico City basin
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Mapping Geologic Interfaces that may alter seismic wave propagation in the Mexico City basin

机译：映射可能改变墨西哥城盆地地震波传播的地质界面

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Abstract:Mexico City experienced a large amount of damage during the September 19, 1985, earthquake. Although the whole city experienced different destruction degrees the region of maximum damage was constrained to a densely populated area west from the international airport, where water saturated sediments are still abundant. Other regions within the city, also with saturated sediments, did not experience a similar destruction. Among the mechanisms proposed to explain such large amount of destruction, one was proposed involving the interaction of incoming and reflected seismic waves in, or close to, the saturated surface. The existence and location of seismic wave reflecting surfaces within the basin of Mexico is thus of basic importance. It is herein proposed that high-density geologic structures within the basin may constitute those reflecting surfaces. 2-D gravity modeling is performed across the basin between Sierra del Tepeyac(N) and Xochimilco (S); some lines intersect and model volcanic structures in this region. A 3-D inversion of the gravity field shows that Sierra del Tepeyac-Pe?ón de Los Ba?os is a dense structure potentially capable of reflecting seismic waves towards the west, while Sierra de Santa Catarina would preferentially reflect them towards the south. The high-density regions are defined and mapped in 3-D space. These findings support the possibility of strong interactions between seismic waves travelling in opposite directions in selected regions of the Mexico basin. The reflection mechanism will obviously be proportional to the magnitude of the originating seismic disturbance.
机译：摘要：墨西哥城在1985年9月19日的地震中遭受了巨大的破坏。尽管整个城市遭受的破坏程度不同，但破坏最大的区域被限制在国际机场以西的人口稠密地区，那里的水饱和沉积物仍然丰富。该市内其他地区也有饱和的沉积物，也没有遭受类似的破坏。在解释这种巨大破坏的机制中，有人提出了一种机制，其中涉及在饱和表面或接近饱和表面的入射和反射地震波的相互作用。因此，墨西哥盆地内地震波反射面的存在和位置具有根本的重要性。本文提出，盆地内的高密度地质结构可以构成那些反射面。在Sierra del Tepeyac（N）和Xochimilco（S）之间的整个盆地进行了二维重力模拟。一些线在该区域相交并模拟了火山构造。重力场的3D反演表明，塞拉德尔·特佩亚克·佩翁·德·洛斯巴索斯岛是一个致密的结构，有可能向西反射地震波，而圣卡塔琳娜山脉则优先将其向南反射。高密度区域在3-D空间中定义和映射。这些发现支持在墨西哥盆地的选定区域中沿相反方向传播的地震波之间可能发生强相互作用的可能性。反射机制显然与原始地震干扰的大小成正比。

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