Abstract
A high-resolution ground and marine magnetic survey was executed to determine the structure of the subsurface and the thickness of the sedimentary cover in the Mygdonian Basin. A spacing of approximately 250 m or 500 m between measurement stations was selected to cover an area of 15 km × 22 km. Edge detectors such as total horizontal derivative (THDR), analytic signal (AS), tilt derivative (TDR), enhanced total horizontal gradient of tilt derivative (ETHDR) were applied to map the subsurface structure. Depth was estimated by power spectrum analysis, tilt derivative, source parameter imaging (SPI), and 2D-forward modeling techniques. Spectral analysis and SPI suggest a depth to the basement ranging from near surface to 600 m. For some selected locations, depth was also calculated using the TDR technique suggesting depths from 160 to 400 m. 2D forward magnetic modeling using existing boreholes as constraints was carried out along four selected profiles and confirmed the presence of alternative horsts and grabens formed by parallel normal faults. The dominant structural trends inferred from THDR, AS, TDR, and ETHDR are N–S, NW–SE, NE–SW and E–W. This corresponds with the known structural trends in the area. Finally, a detailed structural map showing the magnetic blocks and the structural architecture of the Mygdonian Basin was drawn up by collating all of the results.
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Acknowledgements
The study was supported by the Marie Curie Reintegration Grant IGSEA—Integrated Nonseismic Geophysical Studies to Assess the Site Effect of the EUROSEISTEST Area in Northern Greece—PERG03-GA-2008-230915 {REF RTD REG/T.2 (2008)D/596232}, the School of Geology of the Aristotle University of Thessaloniki and the Institute of Engineering Seismology and Earthquake Engineering (ITSAK) in Thessaloniki. We thank Professor Konstantinos Albanakis, Dr. Alexandros Savvaidis, Dr. Juliane Adrian, and Dr. Hannah Langenbach and many of our colleagues for their support. We also thank two anonymous reviewers and Editor Nils Olsen for their constructive comments that have greatly improved the manuscript. The first author is hugely indebted to the Institute of International Education (IIE)—USA and to the University of Cologne for hosting him as a postdoctoral academic visitor.
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Ibraheem, I.M., Gurk, M., Tougiannidis, N. et al. Subsurface Investigation of the Neogene Mygdonian Basin, Greece Using Magnetic Data. Pure Appl. Geophys. 175, 2955–2973 (2018). https://doi.org/10.1007/s00024-018-1809-x
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DOI: https://doi.org/10.1007/s00024-018-1809-x