TERC3 - Tremplin-ERC

Probabilistic investigation of fault slip and coupling over the earthquake cycle – PISCO

Submission summary

Abstract of my project submitted to the ERC-STG-2017 call

The ever-increasing amount of geophysical data continuously opens new perspectives on fundamental aspects of the seismogenic behavior of active faults. In this context, studying the interrelation between seismic and aseismic fault slip is essential to understand what causes and what triggers earthquakes. Despite significant advances in the last 15 years, a number of key questions still remain. How is aseismic slip related with the spatial and temporal distribution of earthquakes? Is there a unified physical mechanism explaining the occurrence of seismic and aseismic slip? The problem is that fault processes span a tremendous range of time-scales. Earthquakes propagate during seconds to minutes while inter-seismic strain accumulates for decades, centuries and even millenniums in regions of low strain rate. While different modeling strategies are used to infer seismic or aseismic slip, only a joint interpretation of inter-, co- and post-seismic datasets can allow us to fully explore the interactions between these two slip modes.

The proposed work is to develop an entirely new approach, where all available datasets are assimilated to produce a unified model describing seismic and aseismic slip at all resolvable scales of the earthquake cycle. Such model will describe the evolution of inter-seismic and post-seismic slip with a resolution of a few days but also seismic ruptures propagating for tens to hundreds of seconds. In Chile, where various datasets are available, we will produce a new generation of time-dependent slip models, by jointly inverting geodetic, seismological and tsunami observations. This will allow us to address key questions on the seismogenic behavior of faults and to investigate the preparatory process of aseismic slow-slip events observed before some large megathrust earthquakes. Our time-dependent slip models will also be updated in near real time and used to automatically detect anomalous departures from steady-state inter-seismic fault slip.

Project coordination

Zacharie Duputel (Institut de Physique du Globe de Strasbourg)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

IPGS Institut de Physique du Globe de Strasbourg

Help of the ANR 149,904 euros
Beginning and duration of the scientific project: December 2017 - 18 Months

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