LIQUEFACTION DURING THE 1990 MANJIL, IRAN, EARTHQUAKE .1. CASE-HISTORY DATA

During the 1990 Manjil, Iran, earthquake (M(s) = 7.7), an estimated 35 ,000 people lost their lives and more than 300,000 were left homeless. The earthquake ground shaking caused enormous destruction of unreinfo rced structures. In addition, widespread liquefaction contributed sign ificantly to building damage in towns as far away as 85 km from the ru ptured fault. Following the earthquake, the authors surveyed the lique faction regions, conducted geotechnical field explorations, and docume nted case histories on liquefaction of level ground, liquefaction-indu ced building settlement, permanent ground displacement, and performanc e of piles and piers in liquefied soils. This article presents and dis cusses the data of the case histories investigated. In addition, based on the evidence from the Manjil earthquake, the importance of geologi c input in mapping of liquefaction potential in earthquake-prone regio ns is demonstrated. In the companion article, the authors present the results of their analyses of liquefaction-related case histories.