Abstract
The presence of buried salt layer in the Ghor Al-Haditha area is discussed concerning sinkhole hazard. Numerous geophysical methods such as seismic refraction (SRFR), reflection (SRFL), seismic tomography, multichannel analysis of surface waves (MASW) were developed earlier for the salt layer identification. Geophysical criteria of salt parameters (such as longitudinal Vp and shear Vs wave velocities) were established to identify salt layers. This paper presents new geophysical results proving the salt extension in the Dead Sea (DS) coastal area in its eastern shore potentially representing a sinkhole hazard. The reprocessing technique of MASW data using the synthetic modeling enabled us to detect salt layer characteristics such as depth to its top, the thickness of the layer, and its Vs velocity. It was established that a salt layer with 7–10 m thick is located at a depth of 37–41 m and is characterized by shear-wave velocity (Vs) of 850–1200 m/s. Similar results were obtained by the Transient Electromagnetic (TEM) resistivity method, which detected a comparatively resistive salt layer at a background of very low resistivity. The resolution of the TEM method allows detecting a salt layer of 3 m thick and more at a depth of 39–40 m. Seismic refraction data processing has shown the presence of a salt layer with a velocity of more than 2900 m/s at approximately or the same depths. Analysis of seismic tomography data also confirms the parameters of the discovered target. Analysis of results of geophysical studies in the western and eastern DS shores, comparison of geological conditions in shores, and sinkhole development, enabled us to conclude with a high probability that salt layers exist in both shores and sinkhole development is determined here by similar mechanisms.
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Acknowledgements
This work was made possible through support provided by the U.S. Agency for International Development, under the terms of Award No M27-050 and NATO's Science for Peace Program (project No. 981128). Thank the field crews of the Al-Balqa Applied University, which has been working in the difficult and dangerous conditions of the Dead Sea sinkhole areas. We thank our colleagues C. Camerlynck, P.-Y. Galibert, L. Bodet, and A. Dhemaied from Paris 6 University for permission to reuse their data. We are grateful to C. Krawczyk for the results of the S-wave reflection survey in the area. We thank four anonymous reviewers for their comprehensive and constructive criticism allowed us to significantly improving the quality of our manuscript.
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Ezersky, M., Eppelbaum, L., Legchenko, A. et al. Salt layer characteristics in the Ghor Al-Haditha area, Jordan: comprehensive combined reprocessing of geophysical data. Environ Earth Sci 80, 124 (2021). https://doi.org/10.1007/s12665-021-09373-4
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DOI: https://doi.org/10.1007/s12665-021-09373-4