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Characterization of active fault behavior - Zahra MOUSAVI

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.

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Summary :

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.

PNG - 928.6 ko
Figure : Seismotectonic setting of eastern Iran with
GPS interseismic velocity field with respect to Eurasia
plate. Black boxes presenet ENVISAT SAR images in
descending (5 tracks) and ascending (2 tracks) orbits.
Df : Doruneh fault, DBF : Dasht-e-Bayaz fault.






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