Fig. 1  Geographical positions of the main center and its related sub-centers. (Egyptian Seismological bulletin, Ser. 1, 2001.)
The two sub-centers at Marsa Alam and El Kharga are still under construction. Triangles and circles denote one and three component sataions respectively. Colours are given according to their collecting sub-centers before the final collection at Helwan main center. Triangles and circles with violet colour indicate Japanese Hurghada seismic network and have been received by Hurghada sub-center.