Seismology in the sense of earthquake research is no longer exclusively a matter of earthquake recording and the analysis of seismograms. The tremendous progress in earth quake dynamic research, the development of sophisticated technologies, the advent of the space age, and the call for reduction of the earthquake hazards and for disaster pre vention programs have spurred interdisciplinary research to discover the earthquake generating processes. The progress in observing the physical phenomena of earthquake generating processes and the identification of earthquake precursors among these phe...