Please note that this session was withdrawn and is no longer available in the respective programme. This withdrawal might have been the result of a merge with another session.

SM4.1

Understanding large subduction earthquakes and tsunamigenesis

Since 2004, there have been a number of large subduction earthquakes whose unexpected rupture features contributed to the generation of devastating tsunamis. The impact that these events have had on human society highlights the need to improve our knowledge of the key mechanisms behind their origin. Advances in these areas have led to progress in our understanding of the most important parameters affecting tsunamigenesis.

With increasing availability of geophysical data and experiments, new descriptions of faulting and rupture complexity have been proposed to better understand inter-seismic coupling, rock deformation and rupture dynamics. These new observations include the detailed description of the spatial variations of elastic rock properties, fault roughness and geometry; the presence of site-specific tectonic features, as well as the changes in sediment and rock lithology and pore pressure, which are particularly pronounced in the shallow part of the megathrust. Rock physicists have proposed new constitutive laws and parameters based on a new generation of laboratory experiments, which simulate close to natural seismic deformation conditions on natural fault samples. Advances in numerical modeling now allow scientists to integrate a wide range of data from ocean drilling, laboratory analyses, geophysical experiments, into simulations of subduction zone processes (i.e. geodynamic, seismic cycling, rupture dynamics, wave propagation modeling, tsunami generation) over a wider range of temporal and spatial scales under increasingly realistic conditions.

In light of these advances, this session has a twofold mission: i) to integrate recent results from different fields to foster a comprehensive understanding of the key parameters controlling the physics of large subduction earthquakes and the associated tsunamigenesis over a range of spatial and temporal scales; and ii) to identify how tsunami hazard analysis can benefit from this multi-disciplinary approach.
We invite abstracts that enhance interdisciplinary collaboration and integrate observations, both seismological and geophysical models, rock physics experiments, analog- and numerical modeling, and tsunami hazard.

Co-organized by
Convener: Fabrizio Romano | Co-conveners: Shane Murphy, Valenti Sallares, Elena Spagnuolo