Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/10409
AuthorsBizzarri, A.* 
Liu, C.* 
TitleNear-field radiated wave field may help to understand the style of the supershear transition of dynamic ruptures
Issue Date2016
Series/Report no./261(2016)
DOI10.1016/j.pepi.2016.05.013
URIhttp://hdl.handle.net/2122/10409
KeywordsComputational seismology
Subject Classification04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics 
AbstractSupershear earthquakes are known to leave special signatures in the signals on the fault (fault slip velocity, dynamic traction evolution, energy flux, etc.) and in the ground motions. Moreover, two different styles of supershear transition have been identified; in the direct transition (DT) mechanism the rupture speed continuously increases from the sub-Rayleigh to the terminal speed of P waves, while in the mother–daughter (MD) mechanism a forbidden zone of rupture speed exists and a secondary pseudorupture is generated ahead of the primary rupture front. Here we found that the off-fault signals (wavefields) generated by these two mechanisms are rather different, in that the MD case contains an enhanced trailing Rayleigh field, which has very low amplitudes (or it is even practically absent) in the DT case, and possess higher frequency content. Therefore, we show that it is possible to distinguish the style of the supershear transition from the records of real earthquakes. In particular, basing on the results of our numerical simulations, we can conclude that the Denali, Alaska, earthquake was basically controlled by a classical MD mechanism.
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