Multi-Line 1D Inversion of Frequency-Domain Helicopter-Borne Electromagnetic Data with Weighted 3D Smoothness Regularization : A Case Study from Northern Iran.

• An efficient pseudo-3D Occam’s inversionscheme is proposed here to stabilize the traditional 1D inversion forthe frequency-domain helicopter-borne electromagnetic (FHEM)data. In this scheme, multiple flight lines are inverted simultane-ously for layered 1D models minimizing a common objectivefunction with lateral, vertical, and cross-line in the model regu-larization function. Applying the lateral, vertical, and cross-lineweighting factors into the regularization matrix yields a morestable solution and produces geologically more realistic results. Inaddition, we investigate how the errors of height measurementsobscure the FHEM response and affect recovered resistivity mod-els. In this inversion, attempt is made to recover a correct altitudethat deals with distortions caused by the presence of measurementheight errors in the reconstructed resistivity models. The compar-ison among 1D, pseudo-2D, and pseudo-3D Occam’s inversions ismade through the analysis of data from two different 3D syntheticmodels and one field dataset acquired from the north of Iran. Theresults indicate that pseudo-3D Occam’s inversion provides fewerinversion artifacts, better model recognition, and smoother andmore continuous models, while, reduces the effects of data noise in an effective manner. 

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)

Nyckelord

Electrical resistivity

FHEM data

height errors

pseudo-3D Occam’s inversion

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