ABSTRACT

This paper presents the earthquake damages of reclaimed lands along the north shore of Osaka Bay due to Great Hanshin Earthquake of 17th January 1995, especially on the geotechnical aspect of the damages, for example, liquefaction of fill material and large lateral movements of quay wall and fill. These damages to the reclaimed lands are to be discussed based on the seismic records recovered from a vertical array of seismic sensors installed at Kobe Port Island and the geotechnical studies on the stability of quay wall concrete caisson structures. The seismic records show how man-made island and supporting seabed strata as deep as 83 meters below the surface behaved during this strong earthquake.

INTRODUCTION

In the early morning, of January 17th, 1995, Great Hanshin Earthquake shook. horrendously the cities such as Kobe, Nishinomiya and Ashiya cities, located along the north coast of Osaka Bay for about 15 seconds. The result was catastrophic as the number of causalities reaching over 5500 and the damages to the cities were so extensive that it can only be described as the cities bombarded by a massive air strike. Kobe City with a population of 1.5 million had the largest import and export harbour facility in Japan, but the city has lost her function completely because of the total collapse of her harbour facilities and other ground transportation facilities. The main cause of damage to the harbour was the collapse of shore line of reclaimed lands, such as Kobe Port Island and Rokko Island which are man-made islands built on the seabed at near-shore of the city. In these reclaimed lands, extensive liquefaction of fill and complete destruction of quay walls along its perimeter have been resulted, and the shore line moved in average 2 to 3 meters outward into the sea and settled as much as 1 meters.

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