Magnetic survey comparison using smart phone magnetic sensor and proton precession magnetometer: A case study at Abu Marwat Concession, Eastern Desert, Egypt

Document Type : Novel Research Articles

Authors

1 geology department, faculty of science, Assiut university

2 Faculty of Science, Department of Geology Assiut University.

3 Geology Department, Faculty of Science, Assiut University, Assiut, 71516, Egypt

4 faculty of science, department of geology, Al-Azhar university (Assiut Branch)

Abstract

One of the most effective geophysical techniques is the magnetic technique, having extensive applications and providing highly reliable information of the subsurface. The main objective of our study is to investigate the capability and efficiency of the smart phone application (Physics toolbox magnetometer) to map the depths of the shallow and deep subsurface magnetic features compared with the proton precession magnetometer at Abu Marwat Concession located at Eastern Desert, Egypt. The magnetic data was collected along 26 profiles with line spacing 10m and station interval 4m and the collected data was processed using the Geosoft Oasis Montaj software. The total magnetic intensity(TMI) map was produced and corrected with reduction to the magnetic pole (RTP) map. The depths of shallow and deep magnetic features were estimated using the radial average power spectrum technique (RAPS), and source power spectrum technique. The RAPS technique of the magnetometer revealed that the average depths of shallow and deep magnetic sources are about -4 m and -9 m, respectively. Whereas the smartphone magnetic sensor RAPS results showed -5m and -13m respectively for the depths of shallow and deep magnetic sources. On the other hand, the source power imaging technique exhibited a range from -1.9m and -4.5m for magnetometer versus a depth range from 0.083m to -9.8m for smartphone magnetic sensor. To conclude, the use of smartphone magnetic sensor for shallow depths estimation gives results comparable to that of the magnetometer. Meanwhile, the estimation of the depths of deep structures varies markedly between the two study tools.

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