Abstract
Quaternary structure around Fukui plain was explored based on the microtremor observation. The observations were carried out every small grid that covered the Fukui plain. We could evaluate two kinds of predominant period from collected Fourier and H/V spectra of microtremor observed on the alluvial plain. It was confirmed that those predominant periods were originated by the basement of alluvium and diluvium respectively. By assuming S wave velocity structures, the thickness of Quaternary system of the sites were estimated based on the predominant periods. By comparing with kinds of inversion analysis results and boring data, the validity of the estimated structure was examined.
