12 novembre 2012 ( dernière mise à jour : 15 novembre 2013 )
Subject : Characterization of active fault behavior in eastern Iran using a combined geodetic (GPS and InSAR) and tectonic approach ; implications on seismic hazard
Supervisors : Andrea Walpersdorf, Erwan Pathier, Richard Walters
Soutenance le 8 novembre 2013.
Eastern Iran has crucial rule in accommodating N-S right-lateral shear between central Iran and Afghanistan. Part of this shear is absorbing at the North of 34 latitude on left-lateral Doruneh. Previous studies on these two major faults show discrepancies between the GPS interseismic slip rate (less than 1 mm/yr) and geological slip rates (2.4 mm/yr). This discrepancy motivated us to use ENVISAT ASAR images investigate how the deformation is distributed in the area. Several InSAR studies have been already successful in measuring long- wavelength ground displacements related to interseismic fault deformation on similar continental strike-slip faults (like the North Anatolian fault or the Haiyuan fault). The most important difficulty of the present study is the slow slip rate of the targeted faults (1 to 3 mm/yr). Even if the East-West orientation of the Doruneh or Dasht-e- Bayaz strike-slip faults is favourable to the measurement from descending or ascending ENVISAT orbits, such low slip rate faults still require some methodological improvement with respect to conventional InSAR.
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