Earthquake monitoring is normally conducted in high dams in Japan. This paper focuses on the effective utilization of earthquake monitoring data for the safety management of dams. Data on arch dams are examined so as to elaborate the management criteria in terms of the response characteristics and the predominant frequency. Such dynamic characteristics of arch dams are formulated with influential factors. In addition, the applicability of microtremor measurement is verified for another method of identifying the predominant frequency of dams through the in-situ measurement of an arch dam. It is concluded that the dynamic characteristics of the dam examined can be utilized as management indices to reveal an abnormal situation or degradation of the dam by detecting their deviations.