Imaging of subsurface lineaments in the southwestern part of the Thrace Basin from gravity data

Abstract

Linear anomalies, as an indicator of the structural features of some geological bodies, are very important for the interpretation of gravity and magnetic data. In this study, an image processing technique known as the Hough transform (HT) algorithm is described for determining invisible boundaries and extensions in gravity anomaly maps. The Hough function implements the Hough transform used to extract straight lines or circles within twodimensional potential field images. It is defined as image and Hough space. In the Hough domain, this function transforms each nonzero point in the parameter domain to a sinusoid. In the image space, each point in the Hough space is transformed to a straight line or circle. Lineaments are depicted from these straight lines which are transformed in the image domain. An application of the Hough transform to the Bouguer anomaly map of the southwestern part of the Thrace Basin, NW Turkey, shows the effectiveness of the proposed approach. Based on geological data and gravity data, the structural features in the southwestern part of the Thrace Basin are investigated by applying the proposed approach and the Blakely and Simpson method. Lineaments identified by these approaches are generally in good accordance with previously-mapped surface faults.

Trakya Havzasının Güneybatısında Fay Parametrelerinin Gravite Gradyent Verilerinden Kestirimi

“…From stratigraphic cross section [20], it is inferred that the density contrasts for left and right layers of the fault can be set to different values. From previous studies [5][6][7][8][9], it is inferred that the thickness of the area is around 4-5km. It is concluded that case II agrees with the geologic information provided in the area and is considered as an appropriate solution for this profile.…”

“…[7] firstly mapped faults in the southwestern of the Thrace basin and reported that the faults lying in this area include several normal faults and mostly strike-slip faults according to their field observations. [8] have determined lineaments in the southwestern of the Thrace basin using Hough transform from gravity data.…”

Mapping and Assessment of Geological Lineaments with the Contribution of Earth Observation Data: A Case Study of the Zaer Granite Massif, Western Moroccan Meseta

“…Thus, lineament mapping is a crucial element in many geological studies, especially in mineral and hydrocarbon exploration [22,29] as well as in hydrogeology [20]. Additionally, lineaments can be employed for structural analysis to understand and reconstruct the geological history of a region [28,30].…”

Interpretation of Gravity and Magnetic Data in the Erbil Plain (Iraqi Kurdistan Region)

“…Gravity and Magnetic geophysical methods are used to determine the spatial variations of the subsurface rock density and magnetic susceptibility which cause small variations in the earth's gravitational and magnetic fields respectively. Gravity and magnetic surveys are often the initial reconnaissance surveys prior to other types of survey such as seismic shooting (Ghaib, 2001;Aydogan et al, 2013). Magnetic readings were not interpreted quantitatively, because no adequate information about the magnetic properties of surface and subsurface rocks is present.…”