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Seismic Wave Propagation & Imaging in Complex Media: European Network

This project focuses on earthquake dynamics, specifically energy balance and complexity. The goal is to move towards new paradigms in earthquake physics, exploring fault zone physical processes and generating high-frequency radiation. The research involves studying complex fault geometry, stress/strength heterogeneities, off-fault dissipation, and plastic strain.

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Seismic Wave Propagation & Imaging in Complex Media: European Network

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  1. Seismic wave Propagation and Imaging in Complex media: a European network • JEAN-PAUL AMPUERO • Post-doc • Host Institution: ETH Zurich • Place of Origin: Lima, Peru • Appointment Time: November 2004 • Project: Earthquakes dynamics: energy balance and complexity. • Task Groups: TG Local Scale: Earthquake Source Dynamics • Cooperation: ENS Paris, IPG Paris

  2. Earthquake source dynamics Background The classical earthquake model: fault plane with friction Problem posed by recent observations: scaling from laboratory to natural faults(fracture energy, stress heterogeneities) Beyond the classical model: • frictional heating and melt lubrication • thermal pressurization of fluids • dilatancy of fault gouge • off-fault dissipation by rock damage

  3. Earthquake source dynamics Focus Group • One of 4 focus groups created at the TG Local Scale workshop (Zurich, march 2005): • Earthquake source dynamics • Source inversion • Kinematic models for strong motion prediction • Code verification (with TG Numerical Methods) Teams involved: IPG Paris ENS Paris ETH Zurich CU Bratislava U Naples INGV Bologna

  4. Earthquake source dynamics Scope of the Focus Group Main goal, as outlined after meetings in Paris (May 2005) and Smolenice (September 2005): Move towards new paradigms in earthquake physics: seismological relevance, mechanical formulation and computational resolution of currently debated fault zone physical processes with focus on processes generating high frequency radiation (destructive ground motion).

  5. Research snapshots Effect of complex fault geometry: the case of kinked faults[ENS Paris/ IPG Paris/ ETH Zurich] Effect of stress/strength heterogeneitieson final earthquake size andrupture style (crack vs. pulse)[ETH Zurich, ENS Paris] Effect of off-fault dissipation: visco-plasticity, damage[ETH Zurich / LMU Munich] Plastic strain

  6. Outlook: introducing new physics • Expected from our next workshop on “Earthquake dynamics and interface behavior: friction, breakdown and off-fault dissipation“ (Paris, March 7-8, 2006): • discriminate the most relevant physical ingredients among recently proposed candidates • summarize their mechanical formulation • discuss their computational implementation

  7. Outlook: bridging the gap between dynamic and inverse modelling • Final step in connection with the Focus Group on Earthquake Source Inversion: • analyze our numerical models with the astigmatic eye of an observational seismologist • provide dynamic constraints for kinematic source inversions

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