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On the mechanics of supershear earthquake ruptures.
Supershear earthquakes are seismic ruptures that spread with a velocity greater than the S-wave speed of the medium surrounding the seismic source. They are known to leave special signatures in the signals on the fault surface (fault slip velocity, dynamic traction evolution, energy flux, etc.) and in the ground motions. Therefore, the understanding of their dynamics is of pivotal importance also for practical purposes. Through the analysis of several numerical experiments we will explore their main features: the different styles of supershear transition, the existence of the forbidden zone of rupture speed, the generated wavefields and their frequency content.