The report presents resutls of strong-motion earthquake observation in Japanese ports in 1990. Strong-motion earthquake observation results, original accelerations, and their degital tabels, corrected accelerations, integrated velocities and displacements, loci of acceleration, velocity and displacement, response spectra and Fourier spectra for corrected acceleration are presented with a brief explanation on the processing of digitization and correction.
　4082 records have been obtained in the network as of December 1990. 214 records of them were obtained during 1990. The network consistes of 81 strong-motion accelerographs as of December 1990.
　This is 24th publication in the series.