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| Delescluse, M.; Montesi, L. G. J.; Chamotrooke, Nicolas. |
| Normal and transform faults originally formed at a spreading-centre can be reactivated in diffuse plate boundary zones and in areas of lithospheric flexure such as at peripheral bulges to subduction zones. Using new seismic reflection profiles and modeling, we investigate how the original oceanic fabric is reactivated in the simple case of fault perpendicular compression. In the Central Indian Basin, well-oriented normal paleofaults were reactivated with reverse motion at the very onset of deformation (9 Ma) but only a small subset remained active past similar to 7 Ma, suggesting that most of the densely spaced small-offset faults were abandoned while deformation localized onto fewer faults with larger spacing. We find a similar evolution using a 2D finite... |
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| Ano: 2008 |
URL: https://archimer.ifremer.fr/doc/00237/34804/33329.pdf |
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| Cattin, R.; Chamot-rooke, N.; Pubellier, M.; Rabaute, A.; Delescluse, M.; Vigny, C.; Fleitout, L.; Dubernet, P.. |
| The 2004 Aceh and 2005 Nias events are the two greatest earthquakes of the past 40 years with a total rupture of 1700 km long and a coseismic slip reaching up to 25 m. These two earthquakes have caused large stress perturbations which significantly altered seismic activity in the Sumatra-Andaman region. Using both detailed mapping of failure planes and various slip distributions, we calculate this stress change along the Sumatra-Andaman-Sagaing fault system from central Sumatra to southern Myanmar. The static Coulomb stress change Delta CFF and the observed seismic activity are in very good agreement with a Coulomb index similar to 20% greater than the one obtained for random events. Compared to previous studies, this high Coulomb Index confirms two... |
| Tipo: Text |
Palavras-chave: Sumatra; Stress triggering; Friction. |
| Ano: 2009 |
URL: https://archimer.ifremer.fr/doc/00297/40803/39820.pdf |
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