Rising of the lowest place on Earth due to Dead Sea water-level drop: Evidence from SAR interferometry and GPS

R. N. Nof, A. Ziv, M. P. Doin, G. Baer, Y. Fialko, Shimon Wdowinski, Y. Eyal, Y. Bock

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

The Dead Sea water-level has been dropping at an exceedingly increasing rate since 1960, and between 1993 and 2001, the interval of the InSAR data examined in this study, it has dropped at an average rate of 0.88 m per year. Such a water-level change could potentially give rise to a resolvable lithospheric rebound and regional uplift, with spatial extent and amplitude that are controlled by the effective mechanical properties of the crust and upper mantle combined. We measure that deformation for the years 1993 to 2001, using 149 short baseline interferograms made of 31 ERS-1 and ERS-2 Synthetic Aperture Radar (SAR) images and continuous GPS data from the Survey of Israel recorded between 1997 and 2011. The uplift rate at the Dead Sea is small (up to 4 mm/year), and the basin topography is almost a mirror of the displacement, introducing a strong trade-off between uplift and stratified atmosphere noise. To overcome this complication, we impose a linearity constraint on the satellite to ground Line Of Sight (LOS) phase changes based on the steady uplift observed by a continuous GPS station in the area of interest, and simultaneously solve for the LOS change rate, Digital Elevation Model (DEM) errors and the elevation-phase correlation. While the LOS rate and DEM errors are solved for each pixel independently, the elevation-phase correlation is solved for each SAR acquisition independently. Using this approach we separated the stratified atmospheric delay from the ground displacement. We observed a regional uplift around the Dead Sea northern basin, with maximum uplift close to the shorelines, and diminishing to zero by the Mediterranean coast. We modeled the effect of water load changes using a homogeneous elastic half-space, and found a good agreement between modeled and observed ground displacements using elastic properties that are compatible with seismic and gravity data down to a depth of 15 km below the Dead Sea basin, suggesting that the response of the crust to the sea level drop is controlled mainly by the elastic properties of the upper-crust immediately below the Dead Sea basin.

Original languageEnglish (US)
Article numberB05412
JournalJournal of Geophysical Research C: Oceans
Volume117
Issue number5
DOIs
StatePublished - 2012

Fingerprint

radar interferometry
sea water
synthetic aperture radar
Water levels
Synthetic aperture radar
Interferometry
Global positioning system
interferometry
water level
GPS
uplift
Earth (planet)
seawater
line of sight
Sea level
digital elevation models
crusts
Topography
Coastal zones
Gravitation

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Rising of the lowest place on Earth due to Dead Sea water-level drop : Evidence from SAR interferometry and GPS. / Nof, R. N.; Ziv, A.; Doin, M. P.; Baer, G.; Fialko, Y.; Wdowinski, Shimon; Eyal, Y.; Bock, Y.

In: Journal of Geophysical Research C: Oceans, Vol. 117, No. 5, B05412, 2012.

Research output: Contribution to journalArticle

Nof, R. N. ; Ziv, A. ; Doin, M. P. ; Baer, G. ; Fialko, Y. ; Wdowinski, Shimon ; Eyal, Y. ; Bock, Y. / Rising of the lowest place on Earth due to Dead Sea water-level drop : Evidence from SAR interferometry and GPS. In: Journal of Geophysical Research C: Oceans. 2012 ; Vol. 117, No. 5.
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