A comparison of different radiomagnetotelluric data inversion methods for buried waste sites

CANDANSAYAR M. E., Tezkan B.

JOURNAL OF APPLIED GEOPHYSICS, cilt.58, sa.3, ss.218-231, 2006 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 58 Sayı: 3
  • Basım Tarihi: 2006
  • Doi Numarası: 10.1016/j.jappgeo.2005.07.001
  • Dergi Adı: JOURNAL OF APPLIED GEOPHYSICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.218-231
  • Anahtar Kelimeler: radioniagnetotelluric, 2D inversion, waste site, smoothing stabilizer, the L2-norm stabilizer, 2-D MAGNETOTELLURIC INVERSION, VLF DATA, GERMANY
  • Ankara Üniversitesi Adresli: Evet

Özet

This study deals with two-dimensional (2D) inversions of synthetic and observed radiomagnetotelluric (RMT) data on typical buried conductive waste sites in Europe, and with the practical aspects of different inversion algorithms. In the inversion calculations, we used smoothing and 1-2-norm stabilizers and compared the results. The resolution of the geometry of the highly conductive waste site, in particular, was investigated. In the inversion with the L2-norm stabilizer, we used the least-squares solution with singular value decomposition (LSSVD) and conjugate gradient (CG), whereas only the conjugate gradient solver was used in the 2D-inversion with the smoothing stabilizer. The inversion results of the synthetic data showed a better resolution of the geometry of the highly conductive waste site when a 1-2-norm stabilizer was applied in the inversion; in particular, a better detection of the bottom of the waste deposit was achieved. Additional model studies were carried out using synthetic RMT data in order to investigate the 2D inversion of RMT data observed on a 3D structure", these studies showed that the use of TM mode data yields a better resolution of the structure than joint inversion of TE and TM modes.