エジプト付近の地震危険度

抄録

Earthquake data in Egypt and its vicinity were compiled and arranged for the period B. C. 2200-A. D. 1978. The data earlier than A. D. 1900 were adjusted with reference to historical documents of earthquake disaster and the others (Period: 1901-1978) were arranged by consulting seismological bulletins of many observatories in the world and the seismological report of Helwan Institute. It was recognized from the above data that active seismic areas in and near Egypt were (1) Central part of Red Sea, (2) Northern part of Red Sea, (3) Levant region and (4) Northeast part of Egypt.
Seismic risk maps for the area concerned, that is, regional distributions of maximum earthquake motion for some return periods were drawn up making use of the aforesaid data, attenuation models and the method of extreme value fitting. The maps consist of the following two kinds; (1) The maximum particle velocity (kine) on the base rock and (2) the maximum acceleration (gal) on the ground. The return periods of these maps are 300 and 600 years, respectively.