Department of Geophysical Imaging

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Toktam Zand

Assistant Professor
 
 
 
 
 

Research Interests

  • Waveform Inversion,
  • Seismic Imaging,
  • Inversion Theory,
  • Crustal-scale imaging,
  • Least-squares Reverse Time Migration,
  • Optimization algorithms,
  • Marine Geophysics,
  • Numerical methods

Positions

  • Assistant Professor (2024-present)
         Department of Geophysical Imaging, Institute of Geophysics, Polish Academy of Sciences, Warsaw, Poland.
  • Post Doc in Geophysics (2022-2024)
         Department of Geophysical Imaging, Institute of Geophysics, Polish Academy of Sciences, Warsaw, Poland.
  • Post Doc in Geomechanics, Geophysics (2021-2022)
        Department of Civil Engineering, K.N. Toosi University of Technology, Tehran, Iran,
        Supervisor: Dr. Hassan Ghasemzadeh.

Education

  • Ph.D. in Seismic, Geophysics
           Institute of Geophysics, University of Tehran, Tehran, Iran, 2014-2020.        
           Thesis Topic: High-resolution reverse-time migration
           Supervisor: Professor Hamidreza Siahkoohi.
 
  •  M.Sc. in Seismic, Geophysics
           Institute of Geophysics, University of Tehran, Tehran, Iran, 2012-2014.
           Thesis Topic: Seismic Velocity Estimation via Total Variation Regularization of Born Approximation
           Supervisors: Professor Ali Gholami and Professor Mauricio Sacchi.
 
  •  B.Sc. in Physics                                                                  
           School of Physics, Department of the Sciences, University of Tehran, Tehran, Iran, 2008-2012.

Publications

  • Zand, T., & Górszczyk, A. (2024). Integrated algorithm for high‐resolution crustal‐scale imaging using complementary OBS and streamer data. Earth and Space Science, 11(2), e2023EA003264.
  • Zand, T., Ghasemzadeh, H., Gholami, A., & Malcolm, A. (2023). Least-squares reverse time migration with shifted total variation regularization. Geophysics, 88(2), S59-S69.
  • Zand, T., & Siahkoohi, H. R. (2021). Sparsity‐promoting least‐squares reverse time migration via preconditioned Bregmanized operator splitting. Geophysical Prospecting, 69(4), 727-744.
  • Zand, T., Siahkoohi, H. R., Malcolm, A., Gholami, A., & Richardson, A. (2020). Consensus optimization of total variation–based reverse time migration. Computational Geosciences, 24, 1393-1407.
  • Zand, T., Malcolm, A., Gholami, A., & Richardson, A. (2019). Compressed imaging to reduce storage in adjoint-state calculations. IEEE Transactions on Geoscience and Remote Sensing, 57(11), 9236-9241.
  • Gholami, A., Richardson, A., Zand, T., & Malcolm, A. (2019). Efficient wavefield reconstruction at half the Nyquist rate. Geophysics, 84(5), A43-A46.
  • Gholami, A., & Zand, T. (2018). Three-parameter Radon transform based on shifted hyperbolas. Geophysics, 83(1), V39-V48.
  • Zand, T., & Gholami, A. (2018). Total-variation based velocity inversion with Bregmanized operator splitting algorithm. Journal of Applied Geophysics, 151, 1-10.
  • Gholami, A., & Zand, T. (2017). Fast ℓ1-regularized Radon transforms for seismic data processing. Digital Signal Processing, 71, 83-94.
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