Moment tensor solutions from waveform inversion of digital and analog data: Physical exploration of seismogenic stress fields and geodynamic processes on different scales.

Moment tensor solutions are important constraints useful to depict the kinematics and to model the dynamics of seismically active areas. In this context moderate-to-major earthquakes, mainly related to regional-scale processes, may be crucial to characterize regional geodynamics and seismic hazard, while lower magnitude earthquakes may contribute to better detail seismic processes and related stress fields on a local scale. Then, capability of estimating high-quality MT solutions through waveform inversion is a crucial issue: on one side the goal is that of lowering the threshold magnitude for stable and reliable MT solutions of recent events, on the other relevant earthquakes occurred from the early age of seismometry to the advent of the digital era need to be analyzed by adapting modern techniques to lower-quality analog data. This effort permit to investigate not fully resolved events of the past by enhancing the invaluable capital of data collected in early instrumental periods. Results presented here, obtained in several applications of different methods, may help understanding how reconstruction of seismic and geodynamic processes at regional and local scale can be improved.