Abstract
Okinawa Prefecture consists of many islands on the wide area of ocean. Therefore shipping and ports are very important in transportation of foods and goods for islanders' livelihood. Under the facts of those things, an earthquake proof berth is essential and should be constructed in this prefecture because earthquakes have occurred in series around Yaeyama Islands in recent years. Though there are many marine faults around Ishigaki Island, it was hard to decide an earthquake scale in the designing an earthquake proof berth of Ishigaki Port. On the other hand, in this occasion it was not clear to evaluate the characteristics of vibration and liquefaction of the coral gravel ground also with its static ones. A few things of this designing including characteristics of coral gravel ground are shown in the present paper.
