The report presents results of strong-motion earthquake observation in Japanese ports in 1986. Strong-motion earthquake observation results, original accelerations and their digital tables, corrected accelerations, integrated velocities and displacements, loci of accelerations, velocities and displacements, response spectra and Fourier spectra for corrected accelerations are presented with a brief explanation on the processing of digitization and correction.
　3037 records have been obtained in the network as of December 1986.
　148 records of them were obtained during 1986.
　The network consistes of 80 strong-motion accelerographs as of December 1986.
　This is 20th publication in the seris.