Discrimination Technique of Soil Liquefaction by Using Observed Earthquake Records

Abstract

This paper proposed a discrimination method of liquefaction induced by the strong ground motion by using monitored records of surface ground accelerations. When the liquefaction occurs, a predominant period of the earthquake time history tends to lengthen. But the phenomena that the predominant period becomes long occur also when the earthquake record contains surface waves. In this paper, we improve the existing technique by taking into account the period characteristics of the up-down component. As this technique adopts non-stationary spectrum, the judgement can be carried out without gathering all time history of the earthquake data. It is suitable for the real-time earthquake disaster prevention.