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B01 - Fault networks and scaling properties of deformation accumulation

Head(s): Prof. Dr. Onno Oncken (GFZ Potsdam), Dr. Matthias Rosenau (GFZ Potsdam), Prof. Dr. Ralf Kornhuber (FU Berlin), Prof. Dr. Alexander Mielke (WIAS)
Project member(s): Joscha Podlesny, Dr. Michael Rudolf
Participating institution(s): FU Berlin, GFZ Potsdam, WIAS

Project Summary

During the first funding period, B01 established a stimulating interplay of analysis, numerical analysis, simulation, and experiments. Main directions of research involved the analysis of rateindependent models for solids, numerical and experimental investigations of subduction zones and single faults, respectively, statistical data analysis of analogue earthquake sequences (in cooperation with the CRC’s Mercator Fellow Illia Horenko), and first steps towards fractal and numerical homogenisation of multiscale fault networks.
In the second funding period, we plan to extend our numerical simulations to single faults in viscoelastic materials and, in parallel, concentrate on the investigation of multiscale fault networks. In particular, we will develop analogue experiments that involve networks of nonplanar, dipping faults with frictional heterogeneities in a layered crust under spatiotemporally variable loading conditions such as relaxation or triggering. On the mathematical side, we will concentrate on numerical methods for viscoelastic multiscale fault networks in 2D and 3D with viscous foundation. As in the first funding period, numerical analysis will be strongly connected to analytical foundations, addressing, e.g., homogenisation and closure of multiscale interface problems. As a joint effort of analysis, simulation, experiments, and data-driven modelling (Mercator Fellow) our goal is to investigate the multiscale structure of fault networks in order to provide a phyical understanding, e.g., of recently detected slow slip events and silent earthquakes apparently filling the gap in scales between short- and longterm geodynamic deformation processes.

Project publications