�@ Œf�ÚŽGŽ��i˜a�j�F “ú–{’n�k�HŠwƒVƒ“ƒ|ƒWƒEƒ€�u‰‰�W Vol�F 4Šª ”N�F 1975”N •Å�F 225-232•Å ’˜ŽÒ�i˜a�j�F - ƒ^ƒCƒgƒ‹�i˜a�j�F - �´˜^�i˜a�j�F
- ƒL�[ƒ��[ƒh�i˜a�j�F - Œf�ÚŽGŽ��i‰p�j�F PROCEEDINGS OF JAPAN EARTHQUAKE ENGINEERING SYMPOSIUM ’˜ŽÒ�i‰p�j�F Tatsuo UWABE, Setsuo NODA ƒ^ƒCƒgƒ‹�i‰p�j�F MAXIMUM GROUND ACCELERATIONS AT COASTS IN TOKYO BAY AND TOKAI DISTRICT �´˜^�i‰p�j�F
In order to obtain the fundamental data which will be helpful in planning the countermeasures against the earthquake disaster, accelerations due to the expected catastrophic earthquakes were estimated at the ground surface of 223 sites around coasts along Tokyo bay and Tokai district. Four great earthquakes such as Kanto earthquake in 1923 were chosen as the models in due consideration of the seismicity of these areas. Ground motions were calculated by means of multi-reflection theory in which strain dependent modulus and damping of soil were considered. According to the results the major ports and the littorals in both districts were indicated to be in danger because the relatively large ground acceleration and the low natural frequencies of subsoil layer were expected. Therefore, it may be suggested that the facilities in the ports and coasts should be reexamined on their aseismicity in order to function during the great earthquake. ƒL�[ƒ��[ƒh�i‰p�j�F - ‹LŽ–‹æ•ª�F - ‹æ•ª �@�@�@ˆÏˆõ‰ï˜_•¶�W