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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. RENETA BLAGOEVA RAYKOVA Experienced Researcher Host Institution: INGV Bologna Place of Origin: Sofia, Bulgaria Appointment Time: November 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 • RENETA BLAGOEVA RAYKOVA • Experienced Researcher • Host Institution: INGV Bologna • Place of Origin: Sofia, Bulgaria • Appointment Time: November 2005 • Project: Surface Waves: Measurements, Tomography, Inversion, Anizotropy; Shear-wave Velocity Crustal and Upper Mantle Modelling. • Task Groups: TG Planetary Scale • Cooperation: Oslo University

  2. Shear-wave velocity structure from dense seismic array RETREAT * The Earth’s crust has rather heterogeneity structure and it is crucial parameter in the mantle structural modelling.* The crustal structure can be obtained using dispersion properties of the surface waves in period range 5 s – 40 s.* Combination of different data types: group and phase velocities, anisotropy, Love-Rayleigh discrepancy, initial velocity models obtained by receiver function analysis and seismic exploration data.* Modelling the velocity structure of the Earth’s crust and mantle by combination of different methods for surface wave processing (frequency-time analysis, 2D tomography, inversion of dispersion curves, anisotropy and Love-Rayleigh discrepancy).

  3. RETREAT broadband dense seismic array Opportunity: passive dense array of broadband instruments RETREATSeismology team:- INGV, Italy- Yale University, USA- Rutgers University, USA- Geophysical Institute, Czech Rep. Goal: Northern Apennines - the structure and nature of the Moho- the location , internal structure, and strain field of the supra-slab asthenospheric wedge- the shape, extent, and structure of the subducting plate.

  4. Measurements of the group velocity by Frequency Time Analysis (FTAN) This method combine the multiple narrow Gaussian filtering and floating filtering in period-group velocity domain and it is suitable for measurements at long periods as well as at periods below 25 s. Pyrenees region21/09/2004, 5.1 ml Measurements at different scales - planetary, regional and local.

  5. 2D surface wave tomography The method is 2D extension of one-dimensional theory of Backus-Gilbert, calculate the distribution of phase or group velocity on predetermined grid as well as the resolution of the data Data control

  6. Outlook Next steps:* Measurements of surface wave phase velocities using array techniques* Azimuthal variations of Rayleigh wave dispersion* Inversion of group and phase velocities and Love-Rayleigh discrepancy* Comparison and integration of the velocity models obtained by receiver function analysis (J. Park, Yale University, USA) * Developing the applied tools to routine use for different regions with complex structure The obtained velocity model will provide more details for the structure under Northern Apennines that will allows more accurate estimation of the source parameters of the earthquakes, located in the region, as well as more accurate modelling of other geophysical fields.

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