An intraslab normal-faulting earthquake struck the central region of Mexico on 19 September 2017, leading to the collapse of 44 buildings in Mexico City. After the earthquake, the authors collected information in situ and through social media about the collapsed buildings, which was statistically processed to identify the causes of their collapse. This article presents the main collapse statistics, which revealed that 64% of the collapsed buildings had between 1 and 5 stories, 61% had a seismic-force-resisting system based on reinforced concrete columns with flat slabs, 57% experienced a soft-story mechanism, 91% were built before 1985, 43% were located at the corner blocks, and 10% exhibited pounding with neighboring buildings. The spatial distribution of the collapsed buildings and the recorded ground motion features suggest that short- and medium-period buildings having well-known vulnerabilities were particularly prone to collapse under amplified high-frequency seismic waves typical of intraslab normal-faulting earthquakes, such as the 2017 Puebla–Morelos earthquake.

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2017 年 9 月 19 日 (Mw7.1) 地震后墨西哥城倒塌建筑物概览

2017 年 9 月 19 日，墨西哥中部地区发生板内正常断层地震，导致墨西哥城 44 座建筑物倒塌。地震发生后，作者通过社交媒体现场和社交媒体收集了有关倒塌建筑物的信息，并对其进行了统计处理，以确定倒塌的原因。本文介绍了主要的倒塌统计数据，其中 64% 的倒塌建筑物具有 1 至 5 层，61% 具有基于钢筋混凝土柱和平板的抗震系统，57% 经历了软层机制，91% 建于 1985 年之前，43% 位于角落街区，10% 与邻近建筑物发生碰撞。