An Investigation of the Geotechnical Aspects of the June 1999 Central Mexico Earthquakes - Preliminary Assessment

墨西哥中部地区于1999年6月15日(7级矩)和6月21日(6.3级)发生强烈地震。第一次地震造成15人死亡。第二次地震没有造成人员死亡，但数以千计的建筑物遭到破坏，其中一些破坏严重。最显著的影响出现在非加固砖石结构(URM)结构中，如教堂、小土坯房和甘蔗房。在某些情况下，场地效应可能是重要的。一些强震仪器记录了受影响地区的地面运动。来自加州大学伯克利分校(UC)和墨西哥国立自治大学(UNAM)的研究生和教职员工组成的研究小组，在太平洋地震工程研究中心(PEER)的赞助下，对地震岩土问题进行了震后初步实地调查。这一行动是为了支持出版一份关于这些地震的关键岩土问题的报告。这一行动遵循1985年墨西哥地震后得到支助的类似工作，是对为协助维护和分发墨西哥西海岸格雷罗强震台阵数据而提供的支助的补充。与所有震后勘察调查一样，预计墨西哥最近发生的这些地震将提供重要记录和数据。从科学的观点来看，这些大地震是完全规模的实验，不能通过实验室或现场的控制实验来复制。正是通过快速反应侦察工作，才能恢复这些事件的大部分短暂数据，并将其用于进一步减少地震灾害。

Abstract9985983The central region of Mexico experienced strong earthquakes on 15 June (Moment magnitude 7.0) and 21 June 1999 (M = 6.3). The first earthquake resulted in 15 fatalities. There were no deaths resulting from the second earthquake; however thousands of buildings were damaged, some severely. The most notable effects occurred in unreinforced masonry (URM) structures, such as churches and small adobe and cane houses. Site effects were possibly important in some of the cases. A number of strong motion instruments recorded the ground motions in the affected area.A research team of graduate students and faculty from the University of California at Berkeley (UC ) and the National Autonomous University of Mexico (UNAM), made a post-earthquake preliminary field investigation of seismic geotechnical issues, sponsored by the Pacific Earthquake Engineering Research Center (PEER).This action is to support the publication of a report on the key geotechnical aspects of these earthquakes. This report is being made available in hard copy and via the World Wide Web, in order to disseminate the key lessons learned.This action follows similar work that was supported following the 1985 Mexico earthquake, and is complementary to the support being provided to assist in the maintenance and distribution of data from the Guerrero strong motion array along the west coast of Mexico. As with all post-earthquake reconnaissance investigations, it is expected that vital records and data will become available as a result of these recent earthquakes in Mexico. From a scientific viewpoint, these large earthquakes act as full scale experiments that cannot be duplicated via controlled experiments in the laboratory or in the field. It is through quick response reconnaissance efforts that the mostly-ephemeral data from these events can be recovered and used to further advances in earthquake hazard mitigation.