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Surface Wave Propagation in Heterogeneous 3D Structures: Seismic Imaging and Analysis

This project focuses on modeling and analyzing surface wave propagation in complex 3D media using direct and inverse methods. It involves studying seismic wave behavior in isotropic and anisotropic heterogeneities, considering mode coupling and diffraction effects to understand phase, amplitude, and polarization anomalies. The research aims to create phase velocity maps at various depths and analyze synthetic seismic data to improve imaging techniques. By investigating scattering principles and multiple iterations of surface wave interactions, the project seeks to enhance seismic imaging capabilities in complex geological environments.

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Surface Wave Propagation in Heterogeneous 3D Structures: Seismic Imaging and Analysis

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  1. Seismic wave Propagation and Imaging in Complex media: a European network DİĞDEM ACAREL Early Stage Researcher Host Institution: University of Oslo Place of Origin: Istanbul, Turkey Appointment Time: October 2004 Project: Surface waves in 3D structures: direct and inverse methods Task Groups: Planetary scale Cooperation: University of Utrecht

  2. Motivation Phase velocity map at 75 km depth, Marone et al., 2004. Observed waveform (black line), synthetic seismograms computed with MEAN (blue line) and with EAV03 (red line), Marone et al., 2004.

  3. Surface wave synthetic data in heterogeneous structures Modelling surface wave propagation with scattering of surface waves; in 3D isotropic and anisotropic heterogeneities, taking mode coupling, diffraction into account, suitable to analyse phase and amplitude variations and polarisation anomalies.

  4. Principle of scattering: R0: fundamental mode Rayleigh wave, L0: fundamental mode Love wave, R1: 1st overtone

  5. 3 iterations in multiple scattering: 3 orders of scattering: each iteration is pointed out a with a red arrow

  6. 3D model 3D laterally heterogeneous model: (star) indicates the location of the strike- slip point source at a depth of 20 km.

  7. Example of 25s fundamental mode Rayleigh wave eigenfunctions in the reference and perturbed model Left panel: S-wave velocity in the PREM (solid line) and the perturbed model (dashed line). Right panel: Horizontal and vertical displacements with depth of fundamental mode Rayleigh wave.

  8. Incoming plane wave case: Strike-slip point source case: Example 1: Amplitude of and phase difference of the total vertical wavefield with 9 orders of scattering amplitude of the total vertical wavefield phase difference along the line A-B

  9. Incoming plane wave case: Strike-slip point source case: Example 2: Amplitude of and phase difference of the total vertical wavefield with 9 orders of scattering phase difference along the line A-B amplitude of the total vertical wavefield

  10. Incoming plane wave case: Strike-slip point source case: Example 3: Amplitude of and phase difference of the total vertical wavefield with 9 orders of scattering phase difference along the line A-B amplitude of the total vertical wavefield

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