Abstract
It is extremely important to obtain reliable information about actual structural and dynamic properties to evaluate the earthquake-resistance performance of a structure. However, examples of vibration experiments performed for a lighthouse are scarce. This study focuses on estimating the dynamic parameters of the Ujina Lighthouse by performing microtremor measurements and forced oscillation experiments. Although some variation is observed between the damping factors obtained from the measurements and experiments, the natural frequencies obtained from both the methods agree well up to higher modes of vibration. Therefore, microtremor measurement is a useful method to obtain reliable dynamic properties simply and easily.
