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Environmental Earth Sciences

, Volume 70, Issue 4, pp 1463–1478 | Cite as

Geophysical prediction and following development sinkholes in two Dead Sea areas, Israel and Jordan

  • M. G. EzerskyEmail author
  • L. V. Eppelbaum
  • A. Al-Zoubi
  • S. Keydar
  • A. Abueladas
  • E. Akkawi
  • B. Medvedev
Original Article

Abstract

Geophysical methods—seismic refraction (SRFR), electrical resistivity tomography (ERT), and microgravity—were applied to the Dead Sea (DS) sinkhole problem in the Ein Gedi area at the earlier stage of the sinkhole development (1998–2002). They allowed determining the sinkhole formation mechanism and localizing the sinkhole hazardous zones. The SRFR method permitted to delineate the underground edge of a salt layer at the depth of 50 m. The salt edge was shaped like the sinkhole line on the surface. It was concluded that the sinkhole development is linked to the salt edge. Geoelectrical quasi-3D mapping based on the ERT technique detected large resistivity anomalies with 250–300 m2 diameter and 25–35 m deep. The Ein Gedi area has been also mapped by the use of Microgravity method. The residual Bouguer gravity anomaly map shows negative anomalies arranged along the edge of the salt layer. Those gravity anomalies overall are very similar in plan to the resistivity distribution in this area. The results of forward modeling indicate that both high resistivity and residual gravity anomalies are associated with a subsurface decompaction of the soil mass and deep cavity at the sinkhole site. Following monitoring of the sinkhole development carried out by the Geological Survey of Israel confirmed our suggestions. The drilling of numerous boreholes verified the location of the salt edge. Geographical Information System (GIS) database testifies that during 2003–2009 new sinkholes are continuing to develop along the salt edge within a narrow 50–100 m wide strip oriented approximately in north–south direction (slightly parallel to the shoreline). No promotion in west–east direction (perpendicularly to the DS shoreline) was observed in Israel. Collapse of sinkholes and their clustering have been occurred within the area of high resistivity anomaly and negative residual gravity anomaly. Similar studies carried out at the Ghor Al-Haditha area (Jordan) have shown that sinkholes there are also arranged along the winding line conforming to the salt edge. In this area sinkholes are slowly moved to the Dead Sea direction. Results of geophysical studies in numerous DS sites indicate similar sinkhole development. It allowed generating of the sinkhole formation model based on ancient (10,000–11,000-year old) salt belt girding the Dead Sea along its shores

Keywords

Dead Sea Sinkholes Seismic refraction ERT Microgravity 

Notes

Acknowledgments

This publication was made possible through support provided by the U.S. Agency for International Development, under terms of Award No M27-050. The opinions expressed herein are those of the author(s) and do not necessary reflect the views of the USAID. We are also grateful to the Ministry of Infrastructure of Israel for supporting this investigation. We thank Drs. M. Rybakov and V. Goldshmidt for their contribution to the sinkhole problem decision.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • M. G. Ezersky
    • 1
    Email author
  • L. V. Eppelbaum
    • 2
  • A. Al-Zoubi
    • 3
  • S. Keydar
    • 1
  • A. Abueladas
    • 3
  • E. Akkawi
    • 3
  • B. Medvedev
    • 1
    • 4
  1. 1.Geophysical Institute of IsraelLodIsrael
  2. 2.Department of Geophysics and Planetary Sciences, Raymond and Beverly Sackler Faculty of Exact SciencesTel Aviv UniversityTel AvivIsrael
  3. 3.Al-Balqa Applied UniversitySaltJordan
  4. 4.SchlumbergerMilanItaly

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