A seismic signal that propagates from an earthquake source to a specific seismic recorder carries with it coded information on the source and the propagation medium. To understand the physical processes of the source, there is thus the need for accurate knowledge of the propagation. At large distances with respect to the dimensions of a fault, the coherent information on the source is averaged, and a few parameters are sufficient to characterize it, such as the moment and the location of the hypocenter. Records near the source allow, instead, an investigation of its details. Two descriptions of the rupture process are possible. Kinematic models cannot describe the physical processes of the fracture, but they use a few macroscopic parameters for the interpretation of the data, such as the rupture velocity, the slip and the rise-time. The dynamic models of the source, instead, interpret the fracture process through an energy balance.
In this sector, the RISSC is involved in the following activities:
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SPICE - Seismic wave Propagation and Imaging in Complex media: a European network
Main publicationsNatural and Experimental Evidence of Melt Lubrification of Faults During Earthquakes