|
|
|
|
| |
|
|
| 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 |
| |
|
|
| Cox, Rónadh; Ardhuin, Fabrice; Dias, Frédéric; Autret, Ronan; Beisiegel, Nicole; Earlie, Claire S.; Herterich, James G.; Kennedy, Andrew; Paris, Raphaël; Raby, Alison; Schmitt, Pal; Weiss, Robert. |
| Coastal boulder deposits (CBD), transported by waves at elevations above sea level and substantial distances inland, are markers for marine incursions. Whether they are tsunami or storm deposits can be difficult to determine, but this is of critical importance because of the role that CBD play in coastal hazard analysis. Equations from seminal work by Nott (1997), here referred to as the Nott Approach, are commonly employed to calculate nominal wave heights from boulder masses as a means to discriminate between emplacement mechanisms. Systematic review shows that this approach is based on assumptions that are not securely founded and that direct relationships cannot be established between boulder measurements and wave heights. A test using an unprecedented... |
| Tipo: Text |
Palavras-chave: Coastal boulder deposits; Storm waves; Tsunami; Hydrodynamic equations; Coastal erosion; Coastal hazard; Coastal geomorphology; Wave modeling. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00610/72237/71040.pdf |
| |
|
|
| Sultan, Nabil; Cattaneo, Antonio; Sibuet, Jean-claude; Schneider, Jean-luc. |
| The swath bathymetric data acquired during the "Sumatra Aftershocks" cruise from the Sunda trench in the Indian Ocean to the north of the Sumatra Island imaged several scars and deposits. In situ pore pressure measurements using the Ifremer piezometer and coring demonstrate that high excess pore pressure and sediment deformation was generated by a recent event in the scar of the slope failure zone identified by J.T. Henstock and co-authors. This excess pore pressure is localized in the upper sedimentary layers and is not related to an interplate subduction process. Numerical simulations of the hydrological system that take into account the hydro-mechanical properties of the upper sediment layer show that the excess pore pressure and sediment deformations... |
| Tipo: Text |
Palavras-chave: Tsunami; Sumatra; Slope failure; Pore pressure; Earthquake. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6740.pdf |
| |
|
|
| Riou, Brieuc; Chaumillon, Eric; Schneider, Jean‐luc; Corrège, Thierry; Chagué, Catherine. |
| Extensive bathymetric and two‐dimensional seismic surveys have been carried out and cores collected in Pago Pago Bay (Tutuila, American Samoa) in order to describe and gain a better understanding of the sediment fill of the bay, which was affected by the 2009 South Pacific Tsunami. Eight sedimentary units were identified over the volcanic bedrock. The basal transgressive unit displays retrograding onlaps towards the shore, whereas the overlying seven aggradational layers alternate between four draping units and three pinching out seaward units. ‘Core to seismic’ correlation reveals that draping units are composed of homogeneous silts, while pinching out units are dominated by very coarse coral fragments showing fresh cuts, mixed with Halimeda plates. The... |
| Tipo: Text |
Palavras-chave: Core to seismic correlation; Holocene; Sediment bay-fill; Shallow marine tsunami deposits; Tectonic activity cycles; Tsunami. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00501/61231/76154.pdf |
| |
|
| |
|
| |
|
|
|
