Abstract
Analyses and Interpretation of Ground Magnetic Data at Sungai Batu, Kedah, Malaysia in Search for Buried Archaeological Remains
Highlights
Magnetic survey measures combined primary magnetic field intensity of the different components of the earth
The earth’s magnetic field can be separated into three parts: the main field which is produced in the outer core and accounts for the very large regional variations in the field intensity and direction; the external field which is produced by electric currents of charged particles in the earth’s ionosphere and the anomalous field which is induced in geological units; and utilities, archaeological remains and other forms of object buried in the earth’s crust
Based on the findings of resistivity and magnetic surveys conducted in the area, the portions marked A, B and C on the figure are the regions of suspected baked clay bricks anomalies.[12,13]
Summary
Magnetic survey measures combined primary magnetic field intensity of the different components of the earth. This has consequences of losing useful anomalies for analysing the subsurface To ameliorate these problems, a phase shift correction known as reduction to the equator (RTE) for areas closer to the equator (or reduction to pole for areas near the magnetic pole) is applied to shift the peaks of the anomaly almost exactly above the causative bodies.[14,15] automatic gain control (AGC) filter is used to enhance signal in regions of low magnetic variability and subdue signal in regions of high background magnetic field. The objective is to characterise and interpret magnetic signatures of buried structures in search for possible archaeological remains in area
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