|
|
|
|
|
| Scala, A.; Lorito, S.; Romano, F.; Murphy, Shane; Selva, J.; Basili, R.; Babeyko, A.; Herrero, A.; Hoechner, A.; Lovholt, F.; Maesano, F. E.; Perfetti, P.; Tiberti, M. M.; Tonini, R.; Volpe, M.; Davies, G.; Festa, G.; Power, W.; Piatanesi, A.; Cirella, A.. |
| The complexity of coseismic slip distributions influences the tsunami hazard posed by local and, to a certain extent, distant tsunami sources. Large slip concentrated in shallow patches was observed in recent tsunamigenic earthquakes, possibly due to dynamic amplification near the free surface, variable frictional conditions or other factors. We propose a method for incorporating enhanced shallow slip for subduction earthquakes while preventing systematic slip excess at shallow depths over one or more seismic cycles. The method uses the classic k(-2) stochastic slip distributions, augmented by shallow slip amplification. It is necessary for deep events with lower slip to occur more often than shallow ones with amplified slip to balance the long-term... |
| Tipo: Text |
Palavras-chave: Tsunamis; Seismic-probabilistic tsunami hazard assessment; Tsunami source models; Stochastic seismic slip distributions. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00619/73097/72233.pdf |
| |
|
|
| Romano, F.; Lorito, S.; Lay, T.; Piatanesi, A.; Volpe, M.; Murphy, Shane; Tonini, R.. |
| Finite-fault models for the 2010 Mw 8.8 Maule, Chile earthquake indicate bilateral rupture with large-slip patches located north and south of the epicenter. Previous studies also show that this event features significant slip in the shallow part of the megathrust, which is revealed through correction of the forward tsunami modeling scheme used in tsunami inversions. The presence of shallow slip is consistent with the coseismic seafloor deformation measured off the Maule region adjacent to the trench and confirms that tsunami observations are particularly important for constraining far-offshore slip. Here, we benchmark the method of Optimal Time Alignment (OTA) of the tsunami waveforms in the joint inversion of tsunami (DART and tide-gauges) and geodetic... |
| Tipo: Text |
Palavras-chave: The 2010 Maule earthquake; Joint inversion; Tsunami; Optimal time alignment; Benchmark. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00665/77691/79764.pdf |
| |
|
|
| Murphy, Shane; Di Toro, G.; Romano, F.; Scala, A.; Lorito, S.; Spagnuolo, E.; Aretusini, S.; Festa, G.; Piatanesi, A.; Nielsen, S.. |
| Seismological, tsunami and geodetic observations have shown that subduction zones are complex systems where the properties of earthquake rupture vary with depth as a result of different pre-stress and frictional conditions. A wealth of earthquakes of different sizes and different source features (e.g. rupture duration) can be generated in subduction zones, including tsunami earthquakes, some of which can produce extreme tsunamigenic events. Here, we offer a geological perspective principally accounting for depth-dependent frictional conditions, while adopting a simplified distribution of on-fault tectonic pre-stress. We combine a lithology-controlled, depth-dependent experimental friction law with 2D elastodynamic rupture simulations for a Tohoku-like... |
| Tipo: Text |
Palavras-chave: Subduction zone; Megathrust; Dynamic rupture; Rock physics experiments; Tsunami earthquake. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00425/53625/54546.pdf |
| |
|
|
|
