1. School of Geosciences and Info-Physics; Central South University; Changsha China
2. Deutsches GeoForschungsZentrum Potsdam; Potsdam Germany
3. Geophysical Center, IPE; Russian Academy of Sciences; Moscow Russia
4. Geology and Geophysics Department, King Saud University; Riyadh Saudi Arabia
5. National Research Institute of Astronomy and Geophysics Seismology Department; Helwan Egypt