1. National Research Institute of Astronomy and Geophysics, NRIAG, 11421 Helwan, Cairo, Egypt
2. Department of Environment Systems, Graduate School of Frontier Sciences, Tokyo University, 5-1-5, Kashiwanoha , Kashiwa-shi,Chiba 277-8563, Japan
3. Geology Department, Faculty of Science, Zagazig University, 44519 Zagazig, Egypt