1. Geodynamics Department, National Research Institute of Astronomy and Geophysics (NRIAG), Helwan, Egypt
2. Seismology Department, National Research Institute of Astronomy and Geophysics (NRIAG), Helwan, Egypt
3. Geoelectric and Geomagnetism Department, National Research Institute of Astronomy and Geophysics (NRIAG), Helwan, Egypt