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S eismic wave P ropagation and I maging in C omplex media: a E uropean network

S eismic wave P ropagation and I maging in C omplex media: a E uropean network. JAN BURJÁNEK Early Stage Researcher Host Institution: CU Bratislava Place of Origin: Prague, Czech Republic Appointment Time: December 2005

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S eismic wave P ropagation and I maging in C omplex media: a E uropean network

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  1. Seismic wave Propagation and Imaging in Complex media: a European network JAN BURJÁNEK Early Stage Researcher Host Institution: CU Bratislava Place of Origin: Prague, Czech Republic Appointment Time: December 2005 Project: Kinematic source model consistent with source dynamics Task Groups: TG Locale Scale Cooperation: University of Naples, GFÚ Prague

  2. Project ScopeDynamic model of k-squared earthquake source model - - joint work withMARTIN GÁLIS We chase physically consistent earthquake source model applicable in strong motion prediction. One of the candidate is the kinematic k-squared model. 1) We translate prescribed slip rates on the fault to dynamic stress filed by DW method and make estimation of constitutive parameters at each point on the fault. 2) We perform forward dynamic simulations using hybrid FE-FD code (Moczo et al., NMESD 2003) with constituve parameters obtained in 1).

  3. Main Results SW parameters We ran forward dynamic simulation and found that the rupture broke the whole fault, however resulting seimic moment was higher than the original one. Slip – DYNAMIC M. Slip – KINEMATIC M. ? We tried to approximate constitutive parameters by linear SW law. Stress time histories Dynamic stress-drops produced by k-squared model are generally not equal to static stress-drops!

  4. Outlook Further, we want to calculate and compare radiated wavefield for both models. We would like to apply same procedure on kinematic model of real earthquake. Static stress drop is very heterogeneous and even negative on some portions of the fault. Such effects may be modelled by complex geometry of the fault. More general friction (rate&state?) may have to be introduced to explain healing on the fault.

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