Since 1962, strong ground motions and earthquake responses of structures have been observed inthe major ports in Japan. By the end of December 2003, 6512 accelerograms had been accumulated andanalyzed at the Port and Airport Research Institute.
　The strong-motion earthquake observation network in Japanese ports consists of 104 strong-motionaccelerographs installed at 60 ports as of December 2003. 66 accelerographs out of 104 are installed onground surface, 31 accelerographs are in ground by using bore-hole and the rest 7 are on structures suchas quay walls. Currently two types of accelerographs are used in the network, namely, the ERS accelerographand the SMAC-MDU accelerograph, both of which are of an electrical type equipped with adigital recorder.
　This report presents results of observation and preliminary analysis of records obtained in 2003.ASCII data of the reproduced accelerograms for all the records in 2003 are available on the attached CDin user-friendly CSV format. Also, computer plots of reproduced accelerograms are available on the CDfor the records with peak accelerations exceeding 20 Gals. For the records with peak accelerations exceeding50 Gals, computer plots of reproduced accelerograms, integrated velocities and displacements,Fourier spectra and response spectra are available on the CD.