1. Minerals TechnologyCentral Metallurgical R&D Institute Helwan Egypt
2. School of Environment and Natural Resources Sciences, Faculty of Science and TechnologyUniversiti Kebangsaan Malaysia Bangi Malaysia
3. School of PhysicsUniversiti Sains Malaysia Minden Malaysia
4. Seismic Studies Center, Geology and Geophysics Department, College of ScienceKing Saud University Riyadh Saudi Arabia