Abstract
The primary objective of this paper is the evaluation of the InSAR derived displacement field caused by the 07/09/1999 Athens earthquake, using as reference an external data source provided by terrestrial surveying along the Mornos river open aqueduct. To accomplish this, a processing chain to render comparable the leveling measurements and the interferometric derived measurements has been developed. The distinct steps proposed include a solution for reducing the orbital and atmospheric interferometric fringes and an innovative method to compute the actual InSAR estimated vertical ground subsidence, for direct comparison with the leveling data. Results indicate that the modeled deformation derived from a series of stacked interferograms, falls entirely within the confidence interval assessed for the terrestrial surveying data.
Highlights
One of the most significant natural disasters to strike Greece in the 20th century was the September7, 1999, 11h 56m 50s UTC, Mw = 5.9 Athens earthquake
The vertical displacement field at the surface level caused by this tectonic event was investigated with space born Synthetic Aperture Radar Interferometry (InSAR), using ERS-2 data
Athens earthquake, using as reference an external data source provided by terrestrial surveying along the Mornos river open aqueduct
Summary
InSAR processing showed a significant deformation with the maximum Line Of Sight (LOS) subsidence being of approximately 6 cm [1] This observation was used in earthquake modeling and fault location mapping [2,3,4,5,6,7,8,9] along the middle of the Parnitha mountain. The region of maximum deformation coincided with the main shock epicenter This area was very close to the Mornos river open aqueduct, used for water supply to Athens. The two co-seismic sets of leveling data were considered adequate to investigate the vertical displacement in the affected by the earthquake area and verify the InSAR derived observations.
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