Since 1962, strong ground motions and earthquake responses of structures have been observed in the major ports in Japan. In 2019, 2056 accelerograms were obtained and analyzed at the Port and Airport Research Institute.
　The strong-motion earthquake observation network in Japanese ports consisted of 160 strong-motion seismometers installed at 61 ports as of December 2019. Seventy-eight seismometers out of 160 are installed on ground surface, 62 seismometers are in ground by using bore-holes and the rest 20 are on structures such as quay walls. Seven types of seismographs were used in the
network in 2019, namely, the ERS, the SMAC-MDU, the Omni, the Basalt, the CV-374, the SAMTAC (SA-355), and the SAMTAC (VSE-355JE) seismographs, all of which were negative feedback seismographs equipped with a digital recorder.
　This report presents the results of observation and preliminary analysis of records obtained in 2019. ASCII data of the recorded accelerations for all the records in 2019 are available on the DVD in the user-friendly CSV format. Also, computer plots of recorded accelerations are available on the DVD for the records with peak accelerations exceeding 20 Gal. For the records with peak accelerations exceeding 50 Gal, computer plots of recorded accelerations, integrated velocities and displacements, Fourier spectra and response spectra are available on the DVD.

Key Words: earthquake, port, strong-motion earthquake observation, acceleration record, Fourier spectra