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Modelling dynamic rupture in olivine-based subducting slabs: From a microscopic to a mesoscopic perspective

Authors

de la Serna Valdés,  Jaime
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Mattesini,  Maurizio
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Buforn,  Elisa
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

López Sánchez,  Carolina
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Pro,  Carmen
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Udías,  Agustín
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

de la Serna Valdés, J., Mattesini, M., Buforn, E., López Sánchez, C., Pro, C., Udías, A. (2023): Modelling dynamic rupture in olivine-based subducting slabs: From a microscopic to a mesoscopic perspective, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-0919


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016541
Abstract
A common mineral for subducting material is olivine, which is a magnesium-ferrosilicate with varying amounts of iron and magnesium. The purpose of this work is to investigate the rigid rupture process of crystalline olivine from an atomistic perspective and to estimate the energy released during the breakdown process of the material. In this study, ab initio calculations have been performed based on the well-known Density Functional Theory (DFT). As a first step, we calculated the electro-structural energy minimum of the unit cell of olivine at 24 GPa, which corresponds to the pressure condition of the subducting slab at a depth of 700 km. To obtain reference stress-strain curves, the relaxed unit cell was strained under a variety of shear distortions. In this way, we were able to calculate the theoretical total energy released by the subducting material during atomistic rupture. To broaden the atomistic energy budget to a macroscale rupture mechanism (i.e., with the size of the fault), we developed a modular multiscale fracture model. Several grain ruptures are simulated in this manner, with each grain containing different crystallographic directions within a polycrystalline olivine matrix. A stochastic simulation scheme was applied to this model to compute multiple grain ruptures and thereby estimate the energy involved in a macroscale rupture. The results obtained were compared to the average moment-scaled functions that were obtained for very deep earthquakes in the Peruvian-Brazilian subduction zone.