Little has yet been made known with regard to the nature of the shock, and the published records of the accompanying sound are so rare that it seems as a rule to have passed unheard. The seismographs at Gifu and Nagoya registered the first half-dozen vibrations, and were then buried beneath the fallen buildings. In the following table, the data from these two stations are therefore incomplete:-- PRINCIPAL MEASUREMENTS OBTAINED FROM SEISMOGRAPHIC RECORDS. -------------------+------------+----------+----------+--------------- | | | | Tokio | Gifu. | Nagoya. | Osaka. | (Imp. Univ.). -------------------+------------+----------+----------+--------------- Maximum horizontal | | | | motion | > 18 mm. | > 26 mm. | 30 mm. | > 35 mm. | | | | Period of ditto | 2.0 secs. | 1.3 sec. | 1.0 sec. | 2.0 secs. | | | | Maximum vertical | | | | motion | > 11.3 mm. | 6.2 mm. | 8 mm. | 9.5 mm. | | | | Period of ditto | 0.9 sec. | 1.5 sec. | 1.0 sec. | 2.4 secs. -------------------+------------+----------+----------+--------------- If the period of the principal vibrations were known, the observations of Professor Omori on the overturning of bodies would enable us to determine the range of motion at different places. For instance, the maximum acceleration at Nagoya was found by these observations to be 2,600 millimetres per second per second, and if we take the period of the greatest horizontal motion to be the same as that of the initial vibrations--namely, 1.3 second, the total range (or double amplitude) would be 223 millimetres, or 8.8 inches. With the same period, and the maximum acceleration observed (at Iwakura and Konaki) of more than 4,300 millimetres per second per second, the total range would be greater than 14.5 inches.[56]