Damage and restoration of the electric power facilities in the 1995 Hyogo - Ken Nanbu earthquake

The greater Kobe region was struck by a devastating earthquake on January 17th, 1995. The Hyogo-ken Nanbu earthquake took the lives of over 5,500 people. The facilities operated by the Kansai Electric Power Company also suffered major damage from the tragic earthquake. Making use of the lessons they have learned from their long experience in responding to the extreme forces of nature, peoples of the utility were able to restore electricity to the disaster areas relatively quickly. This report summarizes the damage and restoration of the electric power facilities and some research works triggered by the earthquake.(AU)

Response caracteristics of thick sedimentary layers based on the deep vertical array observation

This paper describes the results of deep vertical array observation perfomed to understand responses of thick sedimentary horizontal layers. Acceleration responses are evaluated at 9 different levels from the bottom of the boring hole (about-500m) to the ground surface. Moderate nonlinear responses of the near surface layer are observed with the maximum surface acceleration of about 0.1G. Giving the deepest record, numerical simulations are carried out to validate a one-dimensional wave propagation analysis. Moreover, a comparison between an equivalent linear analysis and an effective stress analysis is made to observe the difference due to modelling of soil nonlinearity.(AU)