The present paper focuses on detection of liquefaction using strong ground motion records. First, amplitude characteristics of strong ground motion records were investigated. The time history of the ratio of vertical ground acceleration to the horizontal one was calculated from the strong ground motion records in liquefied area. As the ratio increased after the liquefaction occurred, the ratio seems to be one of the indices for detection of liquefaction. Next, frequency characteristics of the strong ground motion records were studied. The time history of the predominant frequency of the horizontal ground acceleration in liquefied area was calculated. The decrease rate of the predominant frequency was evaluated as one of indices for detection of liquefaction. Moreover, the average predominant frequency during the strong ground motion seems to be another index. These indices were verified by using the strong ground motion records obtained during the 1995 Hyogoken Nambu (Kobe) earthquake in Japan.
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