Collaborative Research: Investigation of Site Effects, Seismic Compression, and Liquefaction in the June 23, 2001 Southern Peru Earthquake

0201468，约瑟夫·沃特曼，德雷克塞尔大学“合作研究：2001年6月23日秘鲁南部地震中场地效应、地震压缩和液化的调查”在过去25年中，世界上最大的地震事件是2001年6月23日秘鲁南部地震(MW=8.4)。它破坏了莫夸加、塔克纳、阿雷基帕、卡马纳和伊洛等城市及其周围地区。事件发生后不久，一个由美国和秘鲁研究人员组成的合作小组对该地区进行了一次地质勘察。其中的主要发现是：(I)一些地区的结构破坏集中，表明场地的影响以及可能的地形放大所造成的破坏程度；(Ii)地震压缩、液化、滑坡和岩石坍塌对受影响地区的道路和桥梁造成了相当大的破坏。秘鲁南部地震等大地震事件提供了一个机会，通过开发和研究详细的案例来促进岩土地震工程实践的发展。这些案例研究对于校准现有的设计程序和抗震规范是无价的，它们通常是开发新的、更可靠的分析程序的跳板。华盛顿州立大学和德雷克塞尔大学的这项合作研究的目的是：(1)记录和研究塔克纳和莫夸加两个城市的场地扩大和地形影响；(2)开发和分析压实填土的地震压缩案例；以及(3)收集和评估液化和相关的横向扩展案例。该研究计划利用了调查人员目前与秘鲁天主教大学的工作关系，以及他们与政府、工程学会和行业的当地官员的接触。这项研究涉及几项任务：(A)开发典型的地面运动；(B)通过测试钻孔、剪切波速测量和实验室实验来描述地下条件；(C)汇编和开发详细的案例记录；(D)分析案例记录；以及(E)及时传播数据和调查结果。案例和相关数据将在一个专门的互联网网站上免费获得，该网站将以英语和西班牙语开发，使美国和国外的个人都能访问。这项研究将为该专业提供一系列案例研究，可用于校准或验证现有的设计和分析程序。它还将帮助制定新的或更新的分析程序以及建筑设计规范和抗震准则。这一发现将对世界各地的地震安全界产生影响，尤其是对太平洋西北部和阿拉斯加等地区，这些地区的地震风险由俯冲事件控制。

0201468, Joseph Wartman, Drexel University"Collaborative Research: Investigation of Site Effects, Seismic Compression, and Liquefaction in the June 23, 2001 Southern Peru Earthquake"During the past 25 years, the largest seismic event worldwide was the Southern Peru Earthquake of June 23, 2001 (Mw = 8.4). It damaged regions in and around the cities of Moquegua, Tacna, Arequipa, Camana, and Ilo. A collaborative team of United States and Peruvian researchers conducted a geotechnical reconnaissance of the region shortly after the event. Among the key finding were: (i) the concentration of structural damage in some areas suggested the influence of site and possibly topographic amplification in the resulting damage levels; (ii) considerable damage occurred to roadways and bridges in the affected regions as a result of seismic compression, liquefaction, landslides, and rockfalls.Large magnitude seismic events such as the Southern Peru Earthquake provide an opportunity to advance the state of geotechnical earthquake engineering practice through the development and study of detailed case histories. These case studies are invaluable for calibration of existing design procedures and seismic codes, and they often serve as a springboard for developing new, more reliable analysis procedures. The objective of this collaborative research between Washington State University and Drexel University is to: (1) document and study site amplification and topographic effects in the cities of Tacna and Moquegua; (2) develop and analyze case histories of seismic compression of compacted fills; and (3) assemble and evaluate case histories of liquefaction and associated lateral spreading. The research plan takes advantage of the investigators' current working relationship with the Catholic University of Peru, and from their contacts with local officials from government, engineering societies, and industry. The research involves several tasks: (a) development of representative ground motions, (b) characterization of subsurface conditions by test borings, shear wave velocity measurements, and laboratory experiments, (c) compilation and development of detailed case histories, (d) analysis of the case histories, and (e) timely dissemination of the data and findings. The case histories and associated data will be freely available on a dedicated Internet site, which will be developed in both English and Spanish to make it accessible to individuals in both the Unites States and abroad.This research will provide the profession with a series of case studies that may be used for calibration or validation of existing design and analysis procedures. It will also aid the development of new or updated analysis procedures and building design codes and seismic guidelines. The findings will have implications for the seismic safety community worldwide, and will be particularly relevant to regions such as the Pacific Northwest and Alaska, where the seismic hazard is controlled by subduction events.