The Study of Geomagnetic Field Southeastern Part of an Najaf-Karbala Plateau, Central Iraq, by World Magnetic Model 2015

Abstract

Abstract In this paper numerical simulations of the Earth’s magnetic field in the south-eastern part of an Najaf-Karbala Plateau and to the north of the centre of An-Najaf governorate have been investigated using the WMM2015 model. The study area is located at (Latitude = 32.3180°-31.99°) N, (Longitude = 44.5160°-44.0690°) E, and ranging altitude between 20-90 m above sea level). The study area was divided into grid of (2000 points) by drawing parallel lines, the interspacing distance between two lines (1 Km). Each line would be divided into several nodes. The space between any two nodes about (0.25 Km), this is done by using Google earth program v.6, Collected the data were latitude, longitude, and elevation from sea level. The data applied by (WMM2015) model and the result data of earth magnetic field elements drawn by Surfer v.13 and converted to the contour map by using the gridding method to find the characteristics of Earth magnetic elements ( Total intensity (F), the East component(Y), Horizontal intensity (H), Down component(Z), the North component(X), Declination (D) ) and Inclination (I)). The contour maps of F, Y, and D have magnetic anomalies that observed the changing in the values in the north western part of the study area. This may be indicating the presence of magnetic anomalies as a result of the presence of subsurface rock structures caused by them, including base rocks or various faults.