Abstract
In this paper, we demonstrate the effectiveness of steerable filters as a method of delineating the boundaries of subsurface geological structures. Steerable filters, generally used for edge detection on 2-D images, have the properties of band pass filters with certain directions and are applied to many image processing problems. We first tested the method on synthetic data and then applied it to the aeromagnetic data of İskenderun Basin and adjacent areas.
İskenderun Basin is located in the Northeastern Mediterranean where African–Arabian and Anatolian plates are actively interacting. The basin fill records a complex tectonic evolution since the Early Miocene, involving ophiolite emplacement, diachronous collision of Eurasian and Arabian plates and subsequent tectonic escape related structures and associated basin formation. Geophysical investigations of the tectonic framework of İskenderun Basin of Turkey provide important insights on the regional tectonics of the Eastern Mediterranean and Middle East. In this study we show geological structures, which are responsible for the magnetic anomalies in İskenderun Basin and enlighten the structural setting of the Northeastern Mediterranean triple junction using steerable filters. We obtained a magnetic anomaly map of the region from the General Directorate of Mineral Research and Exploration as raw data and then evaluated this by steerable filters. We determined the magnetic anomaly boundaries for İskenderun Basin by using various types of steerable filters and correlated these to drilling data and seismic profiles from the Turkish Petroleum Corporation. The result of the steerable filter analysis was a clarified aeromagnetic anomaly map of İskenderun Basin. The tectonic structure of İskenderun Basin is divided into regions by an N–S trending oblique-slip fault defined by the steerable filter outputs. We propose a new tectonic structure model of İskenderun Basin and modify the direction of the East Anatolian Fault Zone. In our model, East Anatolian Fault Zone cross-cuts the basin as a narrow fault zone and continues towards the Cyprus arc.
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Acknowledgement
We thank General Directorate of Mineral Research and Exploration of Turkey for permitting us to use their magnetic data. We are also grateful to Turkish Petroleum Corporation for their well logging and seismic data. We thank Dr. Timur Ustaömer (Geology Department, Istanbul University) for his useful suggestions and constructive review of the paper. We also thank Dr. Demir Kolçak for their helpful suggestions, which greatly improved the manuscript. Our sincere thanks go to Prof. Peter Clift, who made valuable suggestions. We also thank him for correcting the English of the paper. Thanks are due to Edward de Reus and an anonymous reviewer who made incisive and comprehensive critiques and detailed review of the manuscript. This work was supported by Research Institute of Istanbul University, project number 433/13092005.
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Albora, A.M., Sayın, N. & Uçan, O.N. Evaluation of tectonic structure of İskenderun Basin (Turkey) using steerable filters. Mar Geophys Res 27, 225–239 (2006). https://doi.org/10.1007/s11001-006-9002-5
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DOI: https://doi.org/10.1007/s11001-006-9002-5