Effect of Supershear Earthquakes on Structures

Sangaraju, Srihari and Somala, S N (2018) Effect of Supershear Earthquakes on Structures. Masters thesis, Indian Institute of Technology hyderabad.

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Abstract

The structural design of infrastructure near to the fault zones may need a fair estimation of seismic loads. Also, structures respond differently based on how the earthquake ruptured. In a Supershear rupture, the speed of rupture propagation exceeds the Shear-wave velocity of earth-medium. Otherwise, it is called subshear rupture. Supershear ruptures can be generated based on physics using dynamic rupture simulations. There is evidence of natural supershear earthquakes like 1906 San Francisco Earthquake (Song S.G. et at., 2008), 1979 Imperial Valley Earthquake (Archuleta, 1984). This kind of earthquake rupture induces high amplitude ground motions along Fault parallel direction. Very few studies tried to understand the structural response due to supershear ruptured earthquakes. In our study, we simulate supershear and subshear earthquakes using dynamic rupture modelling and focus on understanding the difference in structural response. We also differentiated locations nearby fault zone based on subshear or supershear dominance.

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