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We estimated source spectra, Q value and site amplification factors of the source region of the 2018 Hokkaido Eastern Iburi Earthquake by using spectral inversion analysis. 54 . was obtained in the source region. At HKD126, around which the building damage was severe, the site amplification factor from 1 to 3 Hz was about 10 and larger than surrounding sites. The short-period level of the main shock was two times larger than conventional research. The stress drop slightly showed focal depthdoi:10.5610/jaee.19.4_170 fatcat:txsztnbzwvh2hb7lzfwhofpg3i