Estimating the Depth to the Basement of Anah and Its Surroundings Area, Western Iraq by Using the Source Parameter Imaging and Power Spectrum Techniques


  • Abdulrahman W. Alkhalidi Department of Geology, College of Science, University of Baghdad, Baghdad, Iraq
  • Ali M. Al-Rahim Department of Geology, College of Science, University of Baghdad, Baghdad, Iraq
  • Ahmed S. Mousa Iraq Geological Survey, Ministry of Industry and Minerals



Source parameter imaging; Power spectrum analysis; Aeromagnetic data; Reduction to the pole; Anah area


The varying characteristics of the Precambrian basement rocks and the depth thickness variation of sedimentary cover are significant for geological structure. The Aeromagnetic data was interpreted in order to delineate the depth of the basement of Anah and the surrounding areas by using Source Parameter Imaging (SPI) Technique. Aeromagnetic data Total Magnetic Intensity (TMI) were processed by using the Reduction to the pole (RTP), and Source Parameter Imaging tool (SPI) which was applied to RTP data. The results of SPI showed that the minimum depth of basement rocks in the study area was about 5500 m, this is located at the center and northeast side of the area, while the maximum basement depth was about 11000 m , this is located at the southeastern part. A comparison made between the current study results and the results of previous studies has been done with basement depth inferred from the aeromagnetic interpretation of CGG (1974) and particularly for three selected cities (Rawa, Anah, and Hadithah). The power spectrum method was used by applying a high pass filter with a cutoff value of 90 km wavelength In order to obtain the residual data, the depth to anomalies basement rock bodies were obtained by using the spectrum analysis technique with the help of GET grid software which used to transform data into spectra of two functions (amplitude and frequency). Each part of the spectrum curve can be selected, and then drawing a straight line, each straight line indicates the average depth of the anomaly.




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