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REFUSE

 

 3D Reconstruction of the Fault System

People:

Emanuele Casarotti – emanuele.casarotti@ingv.it

Luigi Vadacca – luigi.vadacca@ingv.it

The Alto Tiberina normal fault system represents an important laboratory for understanding of different unresolved geological and seismological issues (a). The main goal of REFUSE working group is to build a 3D mesh of the Alto Tiberina fault system that will be the basis for different types of modelling. First, mechanical models will contribute to define the distribution of the inter-seismic stress build-up between Alto Tiberina low angle normal fault (ATF) and high-angle faults associated with it. We will use complex geometries of the fault planes as recently displayed by seismic profiles (b) to discover like they can influence the stress distribution. Then the output of these models will became the input of dynamic numerical simulations (c). In this way we will study the effects of different parameters on ground motion (d). The obtained results may have important implications in seismic hazard analysis.

References

  1. Collettini, C. (2011), The mechanical paradox of low-angle normal faults: Current understanding and open questions, Tectonophysics, 510, 253–268, doi:10.1016/j.tecto.2011.07.015.

  1. Mirabella, F., F. Brozzetti, A. Lupattelli, and M. R. Barchi (2011), Tectonic evolution of a low‐angle extensional fault system from restored cross‐sections in the Northern Apennines (Italy), Tectonics, 30, TC6002, doi:10.1029/2011TC002890.

  1. Duan, B., and D. D. Oglesby (2005). The dynamics of thrust and normal faults over multiple earthquake cycles: effects of dipping fault geome- try, Bull. Seismol. Soc. Am. 95, 1623–1636, doi 10.1785/0120040234.

  1. Kaneko, Y., Lapusta, N., Ampuero, J.-P. (2008). Spectral element modeling of spontaneous earthquake rupture on rate and state faults: effect of velocity-strengthening friction at shallow depths. J. Geophys. Res. 113.