The development of techniques Interferometric Synthetic Aperture Radar (InSAR) over the past 15 years has given geologists a useful tool for measuring crustal deformation in regions such as Asia or Iran that have experienced active tectonic. Active deformation in Iran is result of the convergence between Arabian & Eurasian plates. This deformation is marked by belt of faulting & earthquakes
Description
Surface displacement of the 2006 Fin (southern Iran) earthquake from Envisat advanced synthetic aperture radar imagery
By: Mahasa Roustaei
The development of techniques Interferometric Synthetic Aperture Radar (InSAR) over the past 15 years has given geologists a useful tool for measuring crustal deformation in regions such as Asia or Iran that have experienced active tectonic. Active deformation in Iran is result of the convergence between Arabian & Eurasian plates. This deformation is marked by belt of faulting & earthquakes.
The results of using InSAR in Iran have shown that, because of arid environment, can be formed coherent interferograms from Images.
The Mw 5.9,25 March 2006 Fin (southern Iran) earthquake was one of the earthquakes for which Envisat advanced synthetic aperture radar data were available. The region under consideration is situated in the Zagros Active Folded Belt in southern Iran.
Preliminary catalogued solutions (e.g. Harvard Centroid Moment Tensor) for earthquake show thrusting mechanisms with nodal planes striking at ~260° & ~ 97°, dipping at 26° & 64°.
The Ascending data from ASAR on ESA'S ENVISAT satellite has been used. The ascending interferogram for mentioned earthquake has approximately 13 months timespan and shows good coherence over the whole area covered. Two elongated lobes of deformation are observed with a peak-to-trough line of sight displacement of ~ 9.3 cm (3 fringes).The lobes are elongated in NE-SW direction. Left-hand column shows original interferogram before unwrapping, each fringe represents half a wavelength of deformation (2.8 cm) in the satellite line of sight. Right-hand column shows unwrapped data
